Merge remote-tracking branch 'origin/master' into returning

.github/workflows/rust.yml

@@ -290,7 +290,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest]
-        path: [basic, actix_example, actix4_example, rocket_example]
+        path: [basic, actix_example, actix4_example, axum_example, rocket_example]
     steps:
       - uses: actions/checkout@v2
 

README.md

@@ -19,9 +19,10 @@
 #### SeaORM is a relational ORM to help you build light weight and concurrent web services in Rust.
 
 [![Getting Started](https://img.shields.io/badge/Getting%20Started-brightgreen)](https://www.sea-ql.org/SeaORM/docs/index)
-[![Usage Example](https://img.shields.io/badge/Usage%20Example-yellow)](https://github.com/SeaQL/sea-orm/tree/master/examples/basic)
+[![Usage Example](https://img.shields.io/badge/Usage%20Example-green)](https://github.com/SeaQL/sea-orm/tree/master/examples/basic)
+[![Rocket Example](https://img.shields.io/badge/Rocket%20Example-red)](https://github.com/SeaQL/sea-orm/tree/master/examples/rocket_example)
 [![Actix Example](https://img.shields.io/badge/Actix%20Example-blue)](https://github.com/SeaQL/sea-orm/tree/master/examples/actix_example)
-[![Rocket Example](https://img.shields.io/badge/Rocket%20Example-orange)](https://github.com/SeaQL/sea-orm/tree/master/examples/rocket_example)
+[![Axum Example](https://img.shields.io/badge/Axum%20Example-yellow)](https://github.com/SeaQL/sea-orm/tree/master/examples/axum_example)
 [![Discord](https://img.shields.io/discord/873880840487206962?label=Discord)](https://discord.com/invite/uCPdDXzbdv)
 
 ## Features

examples/axum_example/.env

@@ -0,0 +1,3 @@
+HOST=127.0.0.1
+PORT=8000
+DATABASE_URL="postgres://postgres:password@localhost/axum_exmaple"

examples/axum_example/Cargo.toml

@@ -0,0 +1,33 @@
+[package]
+name = "sea-orm-axum-example"
+version = "0.1.0"
+authors = ["Yoshiera Huang <huangjasper@126.com>"]
+edition = "2021"
+publish = false
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+[workspace]
+
+[dependencies]
+tokio = { version = "1.5", features = ["full"] }
+axum = { version = "0.3.0" }
+tower = "0.4.10"
+tower-http = { version = "0.1", features = ["fs"] }
+tower-cookies = { git = "https://github.com/imbolc/tower-cookies" }
+anyhow = "1"
+dotenv = "0.15"
+env_logger = "0.9"
+serde = "1"
+serde_json = "1"
+tera = "1"
+
+[dependencies.sea-orm]
+path = "../../" # remove this line in your own project
+version = "^0.3.0"
+features = ["macros", "runtime-tokio-native-tls"]
+default-features = false
+
+[features]
+default = ["sqlx-postgres"]
+sqlx-mysql = ["sea-orm/sqlx-mysql"]
+sqlx-postgres = ["sea-orm/sqlx-postgres"]

examples/axum_example/README.md

@@ -0,0 +1,10 @@
+# Axum with SeaORM example app
+
+Edit `Cargo.toml` to use `sqlx-mysql` or `sqlx-postgres`.
+
+```toml
+[features]
+default = ["sqlx-$DATABASE"]
+```
+
+Edit `.env` to point to your database.

examples/axum_example/src/flash.rs

@@ -0,0 +1,51 @@
+use axum::http::{header, HeaderMap, HeaderValue, StatusCode};
+use serde::{de::DeserializeOwned, Deserialize, Serialize};
+use tower_cookies::{Cookie, Cookies};
+
+#[derive(Deserialize)]
+struct ValuedMessage<T> {
+    #[serde(rename = "_")]
+    value: T,
+}
+
+#[derive(Serialize)]
+struct ValuedMessageRef<'a, T> {
+    #[serde(rename = "_")]
+    value: &'a T,
+}
+
+const FLASH_COOKIE_NAME: &str = "_flash";
+
+pub fn get_flash_cookie<T>(cookies: &Cookies) -> Option<T>
+where
+    T: DeserializeOwned,
+{
+    cookies.get(FLASH_COOKIE_NAME).and_then(|flash_cookie| {
+        if let Ok(ValuedMessage::<T> { value }) = serde_json::from_str(flash_cookie.value()) {
+            Some(value)
+        } else {
+            None
+        }
+    })
+}
+
+pub type PostResponse = (StatusCode, HeaderMap);
+
+pub fn post_response<T>(cookies: &mut Cookies, data: T) -> PostResponse
+where
+    T: Serialize,
+{
+    let valued_message_ref = ValuedMessageRef { value: &data };
+
+    let mut cookie = Cookie::new(
+        FLASH_COOKIE_NAME,
+        serde_json::to_string(&valued_message_ref).unwrap(),
+    );
+    cookie.set_path("/");
+    cookies.add(cookie);
+
+    let mut header = HeaderMap::new();
+    header.insert(header::LOCATION, HeaderValue::from_static("/"));
+
+    (StatusCode::SEE_OTHER, header)
+}

examples/axum_example/src/main.rs

@@ -0,0 +1,221 @@
+mod flash;
+mod post;
+mod setup;
+
+use axum::{
+    error_handling::HandleErrorExt,
+    extract::{Extension, Form, Path, Query},
+    http::StatusCode,
+    response::Html,
+    routing::{get, post, service_method_routing},
+    AddExtensionLayer, Router, Server,
+};
+use flash::{get_flash_cookie, post_response, PostResponse};
+use post::Entity as Post;
+use sea_orm::{prelude::*, Database, QueryOrder, Set};
+use serde::{Deserialize, Serialize};
+use std::str::FromStr;
+use std::{env, net::SocketAddr};
+use tera::Tera;
+use tower::ServiceBuilder;
+use tower_cookies::{CookieManagerLayer, Cookies};
+use tower_http::services::ServeDir;
+
+#[tokio::main]
+async fn main() -> anyhow::Result<()> {
+    env::set_var("RUST_LOG", "debug");
+    env_logger::init();
+
+    dotenv::dotenv().ok();
+    let db_url = env::var("DATABASE_URL").expect("DATABASE_URL is not set in .env file");
+    let host = env::var("HOST").expect("HOST is not set in .env file");
+    let port = env::var("PORT").expect("PORT is not set in .env file");
+    let server_url = format!("{}:{}", host, port);
+
+    let conn = Database::connect(db_url)
+        .await
+        .expect("Database connection failed");
+    let _ = setup::create_post_table(&conn).await;
+    let templates = Tera::new(concat!(env!("CARGO_MANIFEST_DIR"), "/templates/**/*"))
+        .expect("Tera initialization failed");
+    // let state = AppState { templates, conn };
+
+    let app = Router::new()
+        .route("/", get(list_posts).post(create_post))
+        .route("/:id", get(edit_post).post(update_post))
+        .route("/new", get(new_post))
+        .route("/delete/:id", post(delete_post))
+        .nest(
+            "/static",
+            service_method_routing::get(ServeDir::new(concat!(
+                env!("CARGO_MANIFEST_DIR"),
+                "/static"
+            )))
+            .handle_error(|error: std::io::Error| {
+                (
+                    StatusCode::INTERNAL_SERVER_ERROR,
+                    format!("Unhandled internal error: {}", error),
+                )
+            }),
+        )
+        .layer(
+            ServiceBuilder::new()
+                .layer(CookieManagerLayer::new())
+                .layer(AddExtensionLayer::new(conn))
+                .layer(AddExtensionLayer::new(templates)),
+        );
+
+    let addr = SocketAddr::from_str(&server_url).unwrap();
+    Server::bind(&addr).serve(app.into_make_service()).await?;
+
+    Ok(())
+}
+
+#[derive(Deserialize)]
+struct Params {
+    page: Option<usize>,
+    posts_per_page: Option<usize>,
+}
+
+#[derive(Deserialize, Serialize, Debug, Clone)]
+struct FlashData {
+    kind: String,
+    message: String,
+}
+
+async fn list_posts(
+    Extension(ref templates): Extension<Tera>,
+    Extension(ref conn): Extension<DatabaseConnection>,
+    Query(params): Query<Params>,
+    cookies: Cookies,
+) -> Result<Html<String>, (StatusCode, &'static str)> {
+    let page = params.page.unwrap_or(1);
+    let posts_per_page = params.posts_per_page.unwrap_or(5);
+    let paginator = Post::find()
+        .order_by_asc(post::Column::Id)
+        .paginate(conn, posts_per_page);
+    let num_pages = paginator.num_pages().await.ok().unwrap();
+    let posts = paginator
+        .fetch_page(page - 1)
+        .await
+        .expect("could not retrieve posts");
+
+    let mut ctx = tera::Context::new();
+    ctx.insert("posts", &posts);
+    ctx.insert("page", &page);
+    ctx.insert("posts_per_page", &posts_per_page);
+    ctx.insert("num_pages", &num_pages);
+
+    if let Some(value) = get_flash_cookie::<FlashData>(&cookies) {
+        ctx.insert("flash", &value);
+    }
+
+    let body = templates
+        .render("index.html.tera", &ctx)
+        .map_err(|_| (StatusCode::INTERNAL_SERVER_ERROR, "Template error"))?;
+
+    Ok(Html(body))
+}
+
+async fn new_post(
+    Extension(ref templates): Extension<Tera>,
+) -> Result<Html<String>, (StatusCode, &'static str)> {
+    let ctx = tera::Context::new();
+    let body = templates
+        .render("new.html.tera", &ctx)
+        .map_err(|_| (StatusCode::INTERNAL_SERVER_ERROR, "Template error"))?;
+
+    Ok(Html(body))
+}
+
+async fn create_post(
+    Extension(ref conn): Extension<DatabaseConnection>,
+    form: Form<post::Model>,
+    mut cookies: Cookies,
+) -> Result<PostResponse, (StatusCode, &'static str)> {
+    let model = form.0;
+
+    post::ActiveModel {
+        title: Set(model.title.to_owned()),
+        text: Set(model.text.to_owned()),
+        ..Default::default()
+    }
+    .save(conn)
+    .await
+    .expect("could not insert post");
+
+    let data = FlashData {
+        kind: "success".to_owned(),
+        message: "Post succcessfully added".to_owned(),
+    };
+
+    Ok(post_response(&mut cookies, data))
+}
+
+async fn edit_post(
+    Extension(ref templates): Extension<Tera>,
+    Extension(ref conn): Extension<DatabaseConnection>,
+    Path(id): Path<i32>,
+) -> Result<Html<String>, (StatusCode, &'static str)> {
+    let post: post::Model = Post::find_by_id(id)
+        .one(conn)
+        .await
+        .expect("could not find post")
+        .unwrap();
+
+    let mut ctx = tera::Context::new();
+    ctx.insert("post", &post);
+
+    let body = templates
+        .render("edit.html.tera", &ctx)
+        .map_err(|_| (StatusCode::INTERNAL_SERVER_ERROR, "Template error"))?;
+
+    Ok(Html(body))
+}
+
+async fn update_post(
+    Extension(ref conn): Extension<DatabaseConnection>,
+    Path(id): Path<i32>,
+    form: Form<post::Model>,
+    mut cookies: Cookies,
+) -> Result<PostResponse, (StatusCode, String)> {
+    let model = form.0;
+
+    post::ActiveModel {
+        id: Set(id),
+        title: Set(model.title.to_owned()),
+        text: Set(model.text.to_owned()),
+    }
+    .save(conn)
+    .await
+    .expect("could not edit post");
+
+    let data = FlashData {
+        kind: "success".to_owned(),
+        message: "Post succcessfully updated".to_owned(),
+    };
+
+    Ok(post_response(&mut cookies, data))
+}
+
+async fn delete_post(
+    Extension(ref conn): Extension<DatabaseConnection>,
+    Path(id): Path<i32>,
+    mut cookies: Cookies,
+) -> Result<PostResponse, (StatusCode, &'static str)> {
+    let post: post::ActiveModel = Post::find_by_id(id)
+        .one(conn)
+        .await
+        .unwrap()
+        .unwrap()
+        .into();
+
+    post.delete(conn).await.unwrap();
+
+    let data = FlashData {
+        kind: "success".to_owned(),
+        message: "Post succcessfully deleted".to_owned(),
+    };
+
+    Ok(post_response(&mut cookies, data))
+}

examples/axum_example/src/post.rs

@@ -0,0 +1,26 @@
+//! SeaORM Entity. Generated by sea-orm-codegen 0.3.2
+
+use sea_orm::entity::prelude::*;
+use serde::{Deserialize, Serialize};
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Serialize, Deserialize)]
+#[sea_orm(table_name = "posts")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    #[serde(skip_deserializing)]
+    pub id: i32,
+    pub title: String,
+    #[sea_orm(column_type = "Text")]
+    pub text: String,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter)]
+pub enum Relation {}
+
+impl RelationTrait for Relation {
+    fn def(&self) -> RelationDef {
+        panic!("No RelationDef")
+    }
+}
+
+impl ActiveModelBehavior for ActiveModel {}

examples/axum_example/src/setup.rs

@@ -0,0 +1,33 @@
+use sea_orm::sea_query::{ColumnDef, TableCreateStatement};
+use sea_orm::{error::*, sea_query, ConnectionTrait, DbConn, ExecResult};
+
+async fn create_table(db: &DbConn, stmt: &TableCreateStatement) -> Result<ExecResult, DbErr> {
+    let builder = db.get_database_backend();
+    db.execute(builder.build(stmt)).await
+}
+
+pub async fn create_post_table(db: &DbConn) -> Result<ExecResult, DbErr> {
+    let stmt = sea_query::Table::create()
+        .table(super::post::Entity)
+        .if_not_exists()
+        .col(
+            ColumnDef::new(super::post::Column::Id)
+                .integer()
+                .not_null()
+                .auto_increment()
+                .primary_key(),
+        )
+        .col(
+            ColumnDef::new(super::post::Column::Title)
+                .string()
+                .not_null(),
+        )
+        .col(
+            ColumnDef::new(super::post::Column::Text)
+                .string()
+                .not_null(),
+        )
+        .to_owned();
+
+    create_table(db, &stmt).await
+}

examples/axum_example/static/css/normalize.css

@@ -0,0 +1,427 @@
+/*! normalize.css v3.0.2 | MIT License | git.io/normalize */
+
+/**
+ * 1. Set default font family to sans-serif.
+ * 2. Prevent iOS text size adjust after orientation change, without disabling
+ *    user zoom.
+ */
+
+html {
+  font-family: sans-serif; /* 1 */
+  -ms-text-size-adjust: 100%; /* 2 */
+  -webkit-text-size-adjust: 100%; /* 2 */
+}
+
+/**
+ * Remove default margin.
+ */
+
+body {
+  margin: 0;
+}
+
+/* HTML5 display definitions
+   ========================================================================== */
+
+/**
+ * Correct `block` display not defined for any HTML5 element in IE 8/9.
+ * Correct `block` display not defined for `details` or `summary` in IE 10/11
+ * and Firefox.
+ * Correct `block` display not defined for `main` in IE 11.
+ */
+
+article,
+aside,
+details,
+figcaption,
+figure,
+footer,
+header,
+hgroup,
+main,
+menu,
+nav,
+section,
+summary {
+  display: block;
+}
+
+/**
+ * 1. Correct `inline-block` display not defined in IE 8/9.
+ * 2. Normalize vertical alignment of `progress` in Chrome, Firefox, and Opera.
+ */
+
+audio,
+canvas,
+progress,
+video {
+  display: inline-block; /* 1 */
+  vertical-align: baseline; /* 2 */
+}
+
+/**
+ * Prevent modern browsers from displaying `audio` without controls.
+ * Remove excess height in iOS 5 devices.
+ */
+
+audio:not([controls]) {
+  display: none;
+  height: 0;
+}
+
+/**
+ * Address `[hidden]` styling not present in IE 8/9/10.
+ * Hide the `template` element in IE 8/9/11, Safari, and Firefox < 22.
+ */
+
+[hidden],
+template {
+  display: none;
+}
+
+/* Links
+   ========================================================================== */
+
+/**
+ * Remove the gray background color from active links in IE 10.
+ */
+
+a {
+  background-color: transparent;
+}
+
+/**
+ * Improve readability when focused and also mouse hovered in all browsers.
+ */
+
+a:active,
+a:hover {
+  outline: 0;
+}
+
+/* Text-level semantics
+   ========================================================================== */
+
+/**
+ * Address styling not present in IE 8/9/10/11, Safari, and Chrome.
+ */
+
+abbr[title] {
+  border-bottom: 1px dotted;
+}
+
+/**
+ * Address style set to `bolder` in Firefox 4+, Safari, and Chrome.
+ */
+
+b,
+strong {
+  font-weight: bold;
+}
+
+/**
+ * Address styling not present in Safari and Chrome.
+ */
+
+dfn {
+  font-style: italic;
+}
+
+/**
+ * Address variable `h1` font-size and margin within `section` and `article`
+ * contexts in Firefox 4+, Safari, and Chrome.
+ */
+
+h1 {
+  font-size: 2em;
+  margin: 0.67em 0;
+}
+
+/**
+ * Address styling not present in IE 8/9.
+ */
+
+mark {
+  background: #ff0;
+  color: #000;
+}
+
+/**
+ * Address inconsistent and variable font size in all browsers.
+ */
+
+small {
+  font-size: 80%;
+}
+
+/**
+ * Prevent `sub` and `sup` affecting `line-height` in all browsers.
+ */
+
+sub,
+sup {
+  font-size: 75%;
+  line-height: 0;
+  position: relative;
+  vertical-align: baseline;
+}
+
+sup {
+  top: -0.5em;
+}
+
+sub {
+  bottom: -0.25em;
+}
+
+/* Embedded content
+   ========================================================================== */
+
+/**
+ * Remove border when inside `a` element in IE 8/9/10.
+ */
+
+img {
+  border: 0;
+}
+
+/**
+ * Correct overflow not hidden in IE 9/10/11.
+ */
+
+svg:not(:root) {
+  overflow: hidden;
+}
+
+/* Grouping content
+   ========================================================================== */
+
+/**
+ * Address margin not present in IE 8/9 and Safari.
+ */
+
+figure {
+  margin: 1em 40px;
+}
+
+/**
+ * Address differences between Firefox and other browsers.
+ */
+
+hr {
+  -moz-box-sizing: content-box;
+  box-sizing: content-box;
+  height: 0;
+}
+
+/**
+ * Contain overflow in all browsers.
+ */
+
+pre {
+  overflow: auto;
+}
+
+/**
+ * Address odd `em`-unit font size rendering in all browsers.
+ */
+
+code,
+kbd,
+pre,
+samp {
+  font-family: monospace, monospace;
+  font-size: 1em;
+}
+
+/* Forms
+   ========================================================================== */
+
+/**
+ * Known limitation: by default, Chrome and Safari on OS X allow very limited
+ * styling of `select`, unless a `border` property is set.
+ */
+
+/**
+ * 1. Correct color not being inherited.
+ *    Known issue: affects color of disabled elements.
+ * 2. Correct font properties not being inherited.
+ * 3. Address margins set differently in Firefox 4+, Safari, and Chrome.
+ */
+
+button,
+input,
+optgroup,
+select,
+textarea {
+  color: inherit; /* 1 */
+  font: inherit; /* 2 */
+  margin: 0; /* 3 */
+}
+
+/**
+ * Address `overflow` set to `hidden` in IE 8/9/10/11.
+ */
+
+button {
+  overflow: visible;
+}
+
+/**
+ * Address inconsistent `text-transform` inheritance for `button` and `select`.
+ * All other form control elements do not inherit `text-transform` values.
+ * Correct `button` style inheritance in Firefox, IE 8/9/10/11, and Opera.
+ * Correct `select` style inheritance in Firefox.
+ */
+
+button,
+select {
+  text-transform: none;
+}
+
+/**
+ * 1. Avoid the WebKit bug in Android 4.0.* where (2) destroys native `audio`
+ *    and `video` controls.
+ * 2. Correct inability to style clickable `input` types in iOS.
+ * 3. Improve usability and consistency of cursor style between image-type
+ *    `input` and others.
+ */
+
+button,
+html input[type="button"], /* 1 */
+input[type="reset"],
+input[type="submit"] {
+  -webkit-appearance: button; /* 2 */
+  cursor: pointer; /* 3 */
+}
+
+/**
+ * Re-set default cursor for disabled elements.
+ */
+
+button[disabled],
+html input[disabled] {
+  cursor: default;
+}
+
+/**
+ * Remove inner padding and border in Firefox 4+.
+ */
+
+button::-moz-focus-inner,
+input::-moz-focus-inner {
+  border: 0;
+  padding: 0;
+}
+
+/**
+ * Address Firefox 4+ setting `line-height` on `input` using `!important` in
+ * the UA stylesheet.
+ */
+
+input {
+  line-height: normal;
+}
+
+/**
+ * It's recommended that you don't attempt to style these elements.
+ * Firefox's implementation doesn't respect box-sizing, padding, or width.
+ *
+ * 1. Address box sizing set to `content-box` in IE 8/9/10.
+ * 2. Remove excess padding in IE 8/9/10.
+ */
+
+input[type="checkbox"],
+input[type="radio"] {
+  box-sizing: border-box; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Fix the cursor style for Chrome's increment/decrement buttons. For certain
+ * `font-size` values of the `input`, it causes the cursor style of the
+ * decrement button to change from `default` to `text`.
+ */
+
+input[type="number"]::-webkit-inner-spin-button,
+input[type="number"]::-webkit-outer-spin-button {
+  height: auto;
+}
+
+/**
+ * 1. Address `appearance` set to `searchfield` in Safari and Chrome.
+ * 2. Address `box-sizing` set to `border-box` in Safari and Chrome
+ *    (include `-moz` to future-proof).
+ */
+
+input[type="search"] {
+  -webkit-appearance: textfield; /* 1 */
+  -moz-box-sizing: content-box;
+  -webkit-box-sizing: content-box; /* 2 */
+  box-sizing: content-box;
+}
+
+/**
+ * Remove inner padding and search cancel button in Safari and Chrome on OS X.
+ * Safari (but not Chrome) clips the cancel button when the search input has
+ * padding (and `textfield` appearance).
+ */
+
+input[type="search"]::-webkit-search-cancel-button,
+input[type="search"]::-webkit-search-decoration {
+  -webkit-appearance: none;
+}
+
+/**
+ * Define consistent border, margin, and padding.
+ */
+
+fieldset {
+  border: 1px solid #c0c0c0;
+  margin: 0 2px;
+  padding: 0.35em 0.625em 0.75em;
+}
+
+/**
+ * 1. Correct `color` not being inherited in IE 8/9/10/11.
+ * 2. Remove padding so people aren't caught out if they zero out fieldsets.
+ */
+
+legend {
+  border: 0; /* 1 */
+  padding: 0; /* 2 */
+}
+
+/**
+ * Remove default vertical scrollbar in IE 8/9/10/11.
+ */
+
+textarea {
+  overflow: auto;
+}
+
+/**
+ * Don't inherit the `font-weight` (applied by a rule above).
+ * NOTE: the default cannot safely be changed in Chrome and Safari on OS X.
+ */
+
+optgroup {
+  font-weight: bold;
+}
+
+/* Tables
+   ========================================================================== */
+
+/**
+ * Remove most spacing between table cells.
+ */
+
+table {
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+
+td,
+th {
+  padding: 0;
+}

examples/axum_example/static/css/skeleton.css

@@ -0,0 +1,421 @@
+/*
+* Skeleton V2.0.4
+* Copyright 2014, Dave Gamache
+* www.getskeleton.com
+* Free to use under the MIT license.
+* https://opensource.org/licenses/mit-license.php
+* 12/29/2014
+*/
+
+
+/* Table of contents
+––––––––––––––––––––––––––––––––––––––––––––––––––
+- Grid
+- Base Styles
+- Typography
+- Links
+- Buttons
+- Forms
+- Lists
+- Code
+- Tables
+- Spacing
+- Utilities
+- Clearing
+- Media Queries
+*/
+
+
+/* Grid
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+.container {
+  position: relative;
+  width: 100%;
+  max-width: 960px;
+  margin: 0 auto;
+  padding: 0 20px;
+  box-sizing: border-box; }
+.column,
+.columns {
+  width: 100%;
+  float: left;
+  box-sizing: border-box; }
+
+/* For devices larger than 400px */
+@media (min-width: 400px) {
+  .container {
+    width: 85%;
+    padding: 0; }
+}
+
+/* For devices larger than 550px */
+@media (min-width: 550px) {
+  .container {
+    width: 80%; }
+  .column,
+  .columns {
+    margin-left: 4%; }
+  .column:first-child,
+  .columns:first-child {
+    margin-left: 0; }
+
+  .one.column,
+  .one.columns                    { width: 4.66666666667%; }
+  .two.columns                    { width: 13.3333333333%; }
+  .three.columns                  { width: 22%;            }
+  .four.columns                   { width: 30.6666666667%; }
+  .five.columns                   { width: 39.3333333333%; }
+  .six.columns                    { width: 48%;            }
+  .seven.columns                  { width: 56.6666666667%; }
+  .eight.columns                  { width: 65.3333333333%; }
+  .nine.columns                   { width: 74.0%;          }
+  .ten.columns                    { width: 82.6666666667%; }
+  .eleven.columns                 { width: 91.3333333333%; }
+  .twelve.columns                 { width: 100%; margin-left: 0; }
+
+  .one-third.column               { width: 30.6666666667%; }
+  .two-thirds.column              { width: 65.3333333333%; }
+
+  .one-half.column                { width: 48%; }
+
+  /* Offsets */
+  .offset-by-one.column,
+  .offset-by-one.columns          { margin-left: 8.66666666667%; }
+  .offset-by-two.column,
+  .offset-by-two.columns          { margin-left: 17.3333333333%; }
+  .offset-by-three.column,
+  .offset-by-three.columns        { margin-left: 26%;            }
+  .offset-by-four.column,
+  .offset-by-four.columns         { margin-left: 34.6666666667%; }
+  .offset-by-five.column,
+  .offset-by-five.columns         { margin-left: 43.3333333333%; }
+  .offset-by-six.column,
+  .offset-by-six.columns          { margin-left: 52%;            }
+  .offset-by-seven.column,
+  .offset-by-seven.columns        { margin-left: 60.6666666667%; }
+  .offset-by-eight.column,
+  .offset-by-eight.columns        { margin-left: 69.3333333333%; }
+  .offset-by-nine.column,
+  .offset-by-nine.columns         { margin-left: 78.0%;          }
+  .offset-by-ten.column,
+  .offset-by-ten.columns          { margin-left: 86.6666666667%; }
+  .offset-by-eleven.column,
+  .offset-by-eleven.columns       { margin-left: 95.3333333333%; }
+
+  .offset-by-one-third.column,
+  .offset-by-one-third.columns    { margin-left: 34.6666666667%; }
+  .offset-by-two-thirds.column,
+  .offset-by-two-thirds.columns   { margin-left: 69.3333333333%; }
+
+  .offset-by-one-half.column,
+  .offset-by-one-half.columns     { margin-left: 52%; }
+
+}
+
+
+/* Base Styles
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+/* NOTE
+html is set to 62.5% so that all the REM measurements throughout Skeleton
+are based on 10px sizing. So basically 1.5rem = 15px :) */
+html {
+  font-size: 62.5%; }
+body {
+  font-size: 1.5em; /* currently ems cause chrome bug misinterpreting rems on body element */
+  line-height: 1.6;
+  font-weight: 400;
+  font-family: "Raleway", "HelveticaNeue", "Helvetica Neue", Helvetica, Arial, sans-serif;
+  color: #222; }
+
+
+/* Typography
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+h1, h2, h3, h4, h5, h6 {
+  margin-top: 0;
+  margin-bottom: 2rem;
+  font-weight: 300; }
+h1 { font-size: 4.0rem; line-height: 1.2;  letter-spacing: -.1rem;}
+h2 { font-size: 3.6rem; line-height: 1.25; letter-spacing: -.1rem; }
+h3 { font-size: 3.0rem; line-height: 1.3;  letter-spacing: -.1rem; }
+h4 { font-size: 2.4rem; line-height: 1.35; letter-spacing: -.08rem; }
+h5 { font-size: 1.8rem; line-height: 1.5;  letter-spacing: -.05rem; }
+h6 { font-size: 1.5rem; line-height: 1.6;  letter-spacing: 0; }
+
+/* Larger than phablet */
+@media (min-width: 550px) {
+  h1 { font-size: 5.0rem; }
+  h2 { font-size: 4.2rem; }
+  h3 { font-size: 3.6rem; }
+  h4 { font-size: 3.0rem; }
+  h5 { font-size: 2.4rem; }
+  h6 { font-size: 1.5rem; }
+}
+
+p {
+  margin-top: 0; }
+
+
+/* Links
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+a {
+  color: #1EAEDB; }
+a:hover {
+  color: #0FA0CE; }
+
+
+/* Buttons
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+.button,
+button,
+input[type="submit"],
+input[type="reset"],
+input[type="button"] {
+  display: inline-block;
+  height: 38px;
+  padding: 0 30px;
+  color: #555;
+  text-align: center;
+  font-size: 11px;
+  font-weight: 600;
+  line-height: 38px;
+  letter-spacing: .1rem;
+  text-transform: uppercase;
+  text-decoration: none;
+  white-space: nowrap;
+  background-color: transparent;
+  border-radius: 4px;
+  border: 1px solid #bbb;
+  cursor: pointer;
+  box-sizing: border-box; }
+.button:hover,
+button:hover,
+input[type="submit"]:hover,
+input[type="reset"]:hover,
+input[type="button"]:hover,
+.button:focus,
+button:focus,
+input[type="submit"]:focus,
+input[type="reset"]:focus,
+input[type="button"]:focus {
+  color: #333;
+  border-color: #888;
+  outline: 0; }
+.button.button-primary,
+button.button-primary,
+button.primary,
+input[type="submit"].button-primary,
+input[type="reset"].button-primary,
+input[type="button"].button-primary {
+  color: #FFF;
+  background-color: #33C3F0;
+  border-color: #33C3F0; }
+.button.button-primary:hover,
+button.button-primary:hover,
+button.primary:hover,
+input[type="submit"].button-primary:hover,
+input[type="reset"].button-primary:hover,
+input[type="button"].button-primary:hover,
+.button.button-primary:focus,
+button.button-primary:focus,
+button.primary:focus,
+input[type="submit"].button-primary:focus,
+input[type="reset"].button-primary:focus,
+input[type="button"].button-primary:focus {
+  color: #FFF;
+  background-color: #1EAEDB;
+  border-color: #1EAEDB; }
+
+
+/* Forms
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+input[type="email"],
+input[type="number"],
+input[type="search"],
+input[type="text"],
+input[type="tel"],
+input[type="url"],
+input[type="password"],
+textarea,
+select {
+  height: 38px;
+  padding: 6px 10px; /* The 6px vertically centers text on FF, ignored by Webkit */
+  background-color: #fff;
+  border: 1px solid #D1D1D1;
+  border-radius: 4px;
+  box-shadow: none;
+  box-sizing: border-box; }
+/* Removes awkward default styles on some inputs for iOS */
+input[type="email"],
+input[type="number"],
+input[type="search"],
+input[type="text"],
+input[type="tel"],
+input[type="url"],
+input[type="password"],
+textarea {
+  -webkit-appearance: none;
+     -moz-appearance: none;
+          appearance: none; }
+textarea {
+  min-height: 65px;
+  padding-top: 6px;
+  padding-bottom: 6px; }
+input[type="email"]:focus,
+input[type="number"]:focus,
+input[type="search"]:focus,
+input[type="text"]:focus,
+input[type="tel"]:focus,
+input[type="url"]:focus,
+input[type="password"]:focus,
+textarea:focus,
+select:focus {
+  border: 1px solid #33C3F0;
+  outline: 0; }
+label,
+legend {
+  display: block;
+  margin-bottom: .5rem;
+  font-weight: 600; }
+fieldset {
+  padding: 0;
+  border-width: 0; }
+input[type="checkbox"],
+input[type="radio"] {
+  display: inline; }
+label > .label-body {
+  display: inline-block;
+  margin-left: .5rem;
+  font-weight: normal; }
+
+
+/* Lists
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+ul {
+  list-style: circle inside; }
+ol {
+  list-style: decimal inside; }
+ol, ul {
+  padding-left: 0;
+  margin-top: 0; }
+ul ul,
+ul ol,
+ol ol,
+ol ul {
+  margin: 1.5rem 0 1.5rem 3rem;
+  font-size: 90%; }
+li {
+  margin-bottom: 1rem; }
+
+
+/* Code
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+code {
+  padding: .2rem .5rem;
+  margin: 0 .2rem;
+  font-size: 90%;
+  white-space: nowrap;
+  background: #F1F1F1;
+  border: 1px solid #E1E1E1;
+  border-radius: 4px; }
+pre > code {
+  display: block;
+  padding: 1rem 1.5rem;
+  white-space: pre; }
+
+
+/* Tables
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+th,
+td {
+  padding: 12px 15px;
+  text-align: left;
+  border-bottom: 1px solid #E1E1E1; }
+th:first-child,
+td:first-child {
+  padding-left: 0; }
+th:last-child,
+td:last-child {
+  padding-right: 0; }
+
+
+/* Spacing
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+button,
+.button {
+  margin-bottom: 1rem; }
+input,
+textarea,
+select,
+fieldset {
+  margin-bottom: 1.5rem; }
+pre,
+blockquote,
+dl,
+figure,
+table,
+p,
+ul,
+ol,
+form {
+  margin-bottom: 2.5rem; }
+
+
+/* Utilities
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+.u-full-width {
+  width: 100%;
+  box-sizing: border-box; }
+.u-max-full-width {
+  max-width: 100%;
+  box-sizing: border-box; }
+.u-pull-right {
+  float: right; }
+.u-pull-left {
+  float: left; }
+
+
+/* Misc
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+hr {
+  margin-top: 3rem;
+  margin-bottom: 3.5rem;
+  border-width: 0;
+  border-top: 1px solid #E1E1E1; }
+
+
+/* Clearing
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+
+/* Self Clearing Goodness */
+.container:after,
+.row:after,
+.u-cf {
+  content: "";
+  display: table;
+  clear: both; }
+
+
+/* Media Queries
+–––––––––––––––––––––––––––––––––––––––––––––––––– */
+/*
+Note: The best way to structure the use of media queries is to create the queries
+near the relevant code. For example, if you wanted to change the styles for buttons
+on small devices, paste the mobile query code up in the buttons section and style it
+there.
+*/
+
+
+/* Larger than mobile */
+@media (min-width: 400px) {}
+
+/* Larger than phablet (also point when grid becomes active) */
+@media (min-width: 550px) {}
+
+/* Larger than tablet */
+@media (min-width: 750px) {}
+
+/* Larger than desktop */
+@media (min-width: 1000px) {}
+
+/* Larger than Desktop HD */
+@media (min-width: 1200px) {}

examples/axum_example/static/css/style.css

@@ -0,0 +1,73 @@
+.field-error {
+  border: 1px solid #ff0000 !important;
+}
+
+.field-error-flash {
+  color: #ff0000;
+  display: block;
+  margin: -10px 0 10px 0;
+}
+
+.field-success {
+  border: 1px solid #5ab953 !important;
+}
+
+.field-success-flash {
+  color: #5ab953;
+  display: block;
+  margin: -10px 0 10px 0;
+}
+
+span.completed {
+  text-decoration: line-through;
+}
+
+form.inline {
+  display: inline;
+}
+
+form.link,
+button.link {
+  display: inline;
+  color: #1eaedb;
+  border: none;
+  outline: none;
+  background: none;
+  cursor: pointer;
+  padding: 0;
+  margin: 0 0 0 0;
+  height: inherit;
+  text-decoration: underline;
+  font-size: inherit;
+  text-transform: none;
+  font-weight: normal;
+  line-height: inherit;
+  letter-spacing: inherit;
+}
+
+form.link:hover,
+button.link:hover {
+  color: #0fa0ce;
+}
+
+button.small {
+  height: 20px;
+  padding: 0 10px;
+  font-size: 10px;
+  line-height: 20px;
+  margin: 0 2.5px;
+}
+
+.post:hover {
+  background-color: #bce2ee;
+}
+
+.post td {
+  padding: 5px;
+  width: 150px;
+}
+
+#delete-button {
+  color: red;
+  border-color: red;
+}

examples/axum_example/templates/edit.html.tera

@@ -0,0 +1,49 @@
+{% extends "layout.html.tera" %} {% block content %}
+<div class="row">
+  <h4>Edit Post</h4>
+  <div class="twelve columns">
+    <div class="ten columns">
+      <form action="/{{ post.id }}" method="post">
+        <div class="twelve columns">
+          <input
+            type="text"
+            placeholder="title"
+            name="title"
+            id="title"
+            value="{{ post.title }}"
+            autofocus
+            class="u-full-width"
+          />
+          <input
+            type="text"
+            placeholder="content"
+            name="text"
+            id="text"
+            value="{{ post.text }}"
+            autofocus
+            class="u-full-width"
+          />
+        </div>
+        <div class="twelve columns">
+          <div class="two columns">
+            <a href="/">
+              <input type="button" value="cancel" />
+            </a>
+          </div>
+          <div class="eight columns"></div>
+          <div class="two columns">
+            <input type="submit" value="save post" />
+          </div>
+        </div>
+      </form>
+    </div>
+    <div class="two columns">
+      <form action="/delete/{{ post.id }}" method="post">
+        <div class="two columns">
+          <input id="delete-button" type="submit" value="delete post" />
+        </div>
+      </form>
+    </div>
+  </div>
+</div>
+{% endblock content %}

examples/axum_example/templates/error/404.html.tera

@@ -0,0 +1,11 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta charset="utf-8" />
+    <title>404 - tera</title>
+  </head>
+  <body>
+    <h1>404: Hey! There's nothing here.</h1>
+    The page at {{ uri }} does not exist!
+  </body>
+</html>

examples/axum_example/templates/index.html.tera

@@ -0,0 +1,52 @@
+{% extends "layout.html.tera" %} {% block content %}
+<div class="container">
+  <p><!--Nothing to see here --></p>
+  <h1>Posts</h1>
+  {% if flash %}
+  <small class="field-{{ flash.kind }}-flash">
+    {{ flash.message }}
+  </small>
+  {% endif %}
+  <table>
+    <tbody>
+      <thead>
+        <tr>
+          <th>ID</th>
+          <th>Title</th>
+          <th>Text</th>
+        </tr>
+      </thead>
+      {% for post in posts %}
+      <tr class="post" onclick="window.location='/{{ post.id }}';">
+        <td>{{ post.id }}</td>
+        <td>{{ post.title }}</td>
+        <td>{{ post.text }}</td>
+      </tr>
+      {% endfor %}
+    </tbody>
+    <tfoot>
+      <tr>
+        <td></td>
+        <td>
+          {% if page == 1 %} Previous {% else %}
+          <a href="/?page={{ page - 1 }}&posts_per_page={{ posts_per_page }}"
+            >Previous</a
+          >
+          {% endif %} | {% if page == num_pages %} Next {% else %}
+          <a href="/?page={{ page + 1 }}&posts_per_page={{ posts_per_page }}"
+            >Next</a
+          >
+          {% endif %}
+        </td>
+        <td></td>
+      </tr>
+    </tfoot>
+  </table>
+
+  <div class="twelve columns">
+    <a href="/new">
+      <input type="button" value="add post" />
+    </a>
+  </div>
+</div>
+{% endblock content %}

examples/axum_example/templates/layout.html.tera

@@ -0,0 +1,26 @@
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+    <meta charset="utf-8" />
+    <title>Axum Example</title>
+    <meta name="description" content="Axum - SeaOrm integration example" />
+    <meta name="author" content="Yoshiera Huang" />
+    <meta name="viewport" content="width=device-width, initial-scale=1" />
+
+    <link
+      href="//fonts.googleapis.com/css?family=Raleway:400,300,600"
+      rel="stylesheet"
+      type="text/css"
+    />
+    <link rel="stylesheet" href="/static/css/normalize.css" />
+    <link rel="stylesheet" href="/static/css/skeleton.css" />
+    <link rel="stylesheet" href="/static/css/style.css" />
+    <link rel="icon" type="image/png" href="/static/images/favicon.png" />
+  </head>
+  <body>
+    <div class="container">
+      <p><!--Nothing to see here --></p>
+      {% block content %}{% endblock content %}
+    </div>
+  </body>
+</html>

examples/axum_example/templates/new.html.tera

@@ -0,0 +1,38 @@
+{% extends "layout.html.tera" %} {% block content %}
+<div class="row">
+  <h4>New Post</h4>
+  <form action="/" method="post">
+    <div class="twelve columns">
+      <input
+        type="text"
+        placeholder="enter title"
+        name="title"
+        id="title"
+        value=""
+        autofocus
+        class="u-full-width"
+      />
+      <input
+        type="text"
+        placeholder="enter content"
+        name="text"
+        id="text"
+        value=""
+        autofocus
+        class="u-full-width"
+      />
+    </div>
+    <div class="twelve columns">
+      <div class="two columns">
+        <a href="/">
+          <input type="button" value="cancel" />
+        </a>
+      </div>
+      <div class="eight columns"></div>
+      <div class="two columns">
+        <input type="submit" value="save post" />
+      </div>
+    </div>
+  </form>
+</div>
+{% endblock content %}

sea-orm-codegen/src/entity/writer.rs

@@ -328,19 +328,19 @@ impl EntityWriter {
         let relation_defs = entity.get_relation_defs();
         let quoted = if relation_ref_tables_camel_case.is_empty() {
             quote! {
-                _ => panic!("No RelationDef"),
+                panic!("No RelationDef")
             }
         } else {
             quote! {
-                #(Self::#relation_ref_tables_camel_case => #relation_defs,)*
+                match self {
+                    #(Self::#relation_ref_tables_camel_case => #relation_defs,)*
+                }
             }
         };
         quote! {
             impl RelationTrait for Relation {
                 fn def(&self) -> RelationDef {
-                    match self {
+                    #quoted
-                        #quoted
-                    }
                 }
             }
         }

sea-orm-codegen/tests/compact/filling.rs

@@ -15,9 +15,7 @@ pub enum Relation {}
 
 impl RelationTrait for Relation {
     fn def(&self) -> RelationDef {
-        match self {
+        panic!("No RelationDef")
-            _ => panic!("No RelationDef"),
-        }
     }
 }
 

sea-orm-codegen/tests/compact/rust_keyword.rs

@@ -21,9 +21,7 @@ pub enum Relation {}
 
 impl RelationTrait for Relation {
     fn def(&self) -> RelationDef {
-        match self {
+        panic!("No RelationDef")
-            _ => panic!("No RelationDef"),
-        }
     }
 }
 

sea-orm-codegen/tests/expanded/filling.rs

@@ -51,9 +51,7 @@ impl ColumnTrait for Column {
 
 impl RelationTrait for Relation {
     fn def(&self) -> RelationDef {
-        match self {
+        panic!("No RelationDef")
-            _ => panic!("No RelationDef"),
-        }
     }
 }
 

sea-orm-codegen/tests/expanded/rust_keyword.rs

@@ -70,9 +70,7 @@ impl ColumnTrait for Column {
 
 impl RelationTrait for Relation {
     fn def(&self) -> RelationDef {
-        match self {
+        panic!("No RelationDef")
-            _ => panic!("No RelationDef"),
-        }
     }
 }
 

sea-orm-macros/src/derives/active_enum.rs

@@ -0,0 +1,286 @@
+use heck::CamelCase;
+use proc_macro2::TokenStream;
+use quote::{quote, quote_spanned};
+use syn::{punctuated::Punctuated, token::Comma, Lit, LitInt, LitStr, Meta};
+
+enum Error {
+    InputNotEnum,
+    Syn(syn::Error),
+    TT(TokenStream),
+}
+
+struct ActiveEnum {
+    ident: syn::Ident,
+    enum_name: String,
+    rs_type: TokenStream,
+    db_type: TokenStream,
+    is_string: bool,
+    variants: Vec<ActiveEnumVariant>,
+}
+
+struct ActiveEnumVariant {
+    ident: syn::Ident,
+    string_value: Option<LitStr>,
+    num_value: Option<LitInt>,
+}
+
+impl ActiveEnum {
+    fn new(input: syn::DeriveInput) -> Result<Self, Error> {
+        let ident_span = input.ident.span();
+        let ident = input.ident;
+
+        let mut enum_name = ident.to_string().to_camel_case();
+        let mut rs_type = Err(Error::TT(quote_spanned! {
+            ident_span => compile_error!("Missing macro attribute `rs_type`");
+        }));
+        let mut db_type = Err(Error::TT(quote_spanned! {
+            ident_span => compile_error!("Missing macro attribute `db_type`");
+        }));
+        for attr in input.attrs.iter() {
+            if let Some(ident) = attr.path.get_ident() {
+                if ident != "sea_orm" {
+                    continue;
+                }
+            } else {
+                continue;
+            }
+            if let Ok(list) = attr.parse_args_with(Punctuated::<Meta, Comma>::parse_terminated) {
+                for meta in list.iter() {
+                    if let Meta::NameValue(nv) = meta {
+                        if let Some(name) = nv.path.get_ident() {
+                            if name == "rs_type" {
+                                if let Lit::Str(litstr) = &nv.lit {
+                                    rs_type = syn::parse_str::<TokenStream>(&litstr.value())
+                                        .map_err(Error::Syn);
+                                }
+                            } else if name == "db_type" {
+                                if let Lit::Str(litstr) = &nv.lit {
+                                    let s = litstr.value();
+                                    match s.as_ref() {
+                                        "Enum" => {
+                                            db_type = Ok(quote! {
+                                                Enum(Self::name(), Self::values())
+                                            })
+                                        }
+                                        _ => {
+                                            db_type = syn::parse_str::<TokenStream>(&s)
+                                                .map_err(Error::Syn);
+                                        }
+                                    }
+                                }
+                            } else if name == "enum_name" {
+                                if let Lit::Str(litstr) = &nv.lit {
+                                    enum_name = litstr.value();
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+        }
+
+        let variant_vec = match input.data {
+            syn::Data::Enum(syn::DataEnum { variants, .. }) => variants,
+            _ => return Err(Error::InputNotEnum),
+        };
+
+        let mut is_string = false;
+        let mut is_int = false;
+        let mut variants = Vec::new();
+        for variant in variant_vec {
+            let variant_span = variant.ident.span();
+            let mut string_value = None;
+            let mut num_value = None;
+            for attr in variant.attrs.iter() {
+                if let Some(ident) = attr.path.get_ident() {
+                    if ident != "sea_orm" {
+                        continue;
+                    }
+                } else {
+                    continue;
+                }
+                if let Ok(list) = attr.parse_args_with(Punctuated::<Meta, Comma>::parse_terminated)
+                {
+                    for meta in list {
+                        if let Meta::NameValue(nv) = meta {
+                            if let Some(name) = nv.path.get_ident() {
+                                if name == "string_value" {
+                                    if let Lit::Str(lit) = nv.lit {
+                                        is_string = true;
+                                        string_value = Some(lit);
+                                    }
+                                } else if name == "num_value" {
+                                    if let Lit::Int(lit) = nv.lit {
+                                        is_int = true;
+                                        num_value = Some(lit);
+                                    }
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            if is_string && is_int {
+                return Err(Error::TT(quote_spanned! {
+                    ident_span => compile_error!("All enum variants should specify the same `*_value` macro attribute, either `string_value` or `num_value` but not both");
+                }));
+            }
+
+            if string_value.is_none() && num_value.is_none() {
+                return Err(Error::TT(quote_spanned! {
+                    variant_span => compile_error!("Missing macro attribute, either `string_value` or `num_value` should be specified");
+                }));
+            }
+
+            variants.push(ActiveEnumVariant {
+                ident: variant.ident,
+                string_value,
+                num_value,
+            });
+        }
+
+        Ok(ActiveEnum {
+            ident,
+            enum_name,
+            rs_type: rs_type?,
+            db_type: db_type?,
+            is_string,
+            variants,
+        })
+    }
+
+    fn expand(&self) -> syn::Result<TokenStream> {
+        let expanded_impl_active_enum = self.impl_active_enum();
+
+        Ok(expanded_impl_active_enum)
+    }
+
+    fn impl_active_enum(&self) -> TokenStream {
+        let Self {
+            ident,
+            enum_name,
+            rs_type,
+            db_type,
+            is_string,
+            variants,
+        } = self;
+
+        let variant_idents: Vec<syn::Ident> = variants
+            .iter()
+            .map(|variant| variant.ident.clone())
+            .collect();
+
+        let variant_values: Vec<TokenStream> = variants
+            .iter()
+            .map(|variant| {
+                let variant_span = variant.ident.span();
+
+                if let Some(string_value) = &variant.string_value {
+                    let string = string_value.value();
+                    quote! { #string }
+                } else if let Some(num_value) = &variant.num_value {
+                    quote! { #num_value }
+                } else {
+                    quote_spanned! {
+                        variant_span => compile_error!("Missing macro attribute, either `string_value` or `num_value` should be specified");
+                    }
+                }
+            })
+            .collect();
+
+        let val = if *is_string {
+            quote! { v.as_ref() }
+        } else {
+            quote! { v }
+        };
+
+        quote!(
+            #[automatically_derived]
+            impl sea_orm::ActiveEnum for #ident {
+                type Value = #rs_type;
+
+                fn name() -> String {
+                    #enum_name.to_owned()
+                }
+
+                fn to_value(&self) -> Self::Value {
+                    match self {
+                        #( Self::#variant_idents => #variant_values, )*
+                    }
+                    .to_owned()
+                }
+
+                fn try_from_value(v: &Self::Value) -> Result<Self, sea_orm::DbErr> {
+                    match #val {
+                        #( #variant_values => Ok(Self::#variant_idents), )*
+                        _ => Err(sea_orm::DbErr::Type(format!(
+                            "unexpected value for {} enum: {}",
+                            stringify!(#ident),
+                            v
+                        ))),
+                    }
+                }
+
+                fn db_type() -> sea_orm::ColumnDef {
+                    sea_orm::ColumnType::#db_type.def()
+                }
+            }
+
+            #[automatically_derived]
+            #[allow(clippy::from_over_into)]
+            impl Into<sea_orm::sea_query::Value> for #ident {
+                fn into(self) -> sea_orm::sea_query::Value {
+                    <Self as sea_orm::ActiveEnum>::to_value(&self).into()
+                }
+            }
+
+            #[automatically_derived]
+            impl sea_orm::TryGetable for #ident {
+                fn try_get(res: &sea_orm::QueryResult, pre: &str, col: &str) -> Result<Self, sea_orm::TryGetError> {
+                    let value = <<Self as sea_orm::ActiveEnum>::Value as sea_orm::TryGetable>::try_get(res, pre, col)?;
+                    <Self as sea_orm::ActiveEnum>::try_from_value(&value).map_err(sea_orm::TryGetError::DbErr)
+                }
+            }
+
+            #[automatically_derived]
+            impl sea_orm::sea_query::ValueType for #ident {
+                fn try_from(v: sea_orm::sea_query::Value) -> Result<Self, sea_orm::sea_query::ValueTypeErr> {
+                    let value = <<Self as sea_orm::ActiveEnum>::Value as sea_orm::sea_query::ValueType>::try_from(v)?;
+                    <Self as sea_orm::ActiveEnum>::try_from_value(&value).map_err(|_| sea_orm::sea_query::ValueTypeErr)
+                }
+
+                fn type_name() -> String {
+                    <<Self as sea_orm::ActiveEnum>::Value as sea_orm::sea_query::ValueType>::type_name()
+                }
+
+                fn column_type() -> sea_orm::sea_query::ColumnType {
+                    <Self as sea_orm::ActiveEnum>::db_type()
+                        .get_column_type()
+                        .to_owned()
+                        .into()
+                }
+            }
+
+            #[automatically_derived]
+            impl sea_orm::sea_query::Nullable for #ident {
+                fn null() -> sea_orm::sea_query::Value {
+                    <<Self as sea_orm::ActiveEnum>::Value as sea_orm::sea_query::Nullable>::null()
+                }
+            }
+        )
+    }
+}
+
+pub fn expand_derive_active_enum(input: syn::DeriveInput) -> syn::Result<TokenStream> {
+    let ident_span = input.ident.span();
+
+    match ActiveEnum::new(input) {
+        Ok(model) => model.expand(),
+        Err(Error::InputNotEnum) => Ok(quote_spanned! {
+            ident_span => compile_error!("you can only derive ActiveEnum on enums");
+        }),
+        Err(Error::TT(token_stream)) => Ok(token_stream),
+        Err(Error::Syn(e)) => Err(e),
+    }
+}

sea-orm-macros/src/derives/entity_model.rs

@@ -1,7 +1,7 @@
 use crate::util::{escape_rust_keyword, trim_starting_raw_identifier};
 use heck::CamelCase;
 use proc_macro2::{Ident, Span, TokenStream};
-use quote::quote;
+use quote::{format_ident, quote, quote_spanned};
 use syn::{
     parse::Error, punctuated::Punctuated, spanned::Spanned, token::Comma, Attribute, Data, Fields,
     Lit, Meta,
@@ -193,8 +193,8 @@ pub fn expand_derive_entity_model(data: Data, attrs: Vec<Attribute>) -> syn::Res
                         primary_keys.push(quote! { #field_name });
                     }
 
-                    let field_type = match sql_type {
+                    let col_type = match sql_type {
-                        Some(t) => t,
+                        Some(t) => quote! { sea_orm::prelude::ColumnType::#t.def() },
                         None => {
                             let field_type = &field.ty;
                             let temp = quote! { #field_type }
@@ -206,7 +206,7 @@ pub fn expand_derive_entity_model(data: Data, attrs: Vec<Attribute>) -> syn::Res
                             } else {
                                 temp.as_str()
                             };
-                            match temp {
+                            let col_type = match temp {
                                 "char" => quote! { Char(None) },
                                 "String" | "&str" => quote! { String(None) },
                                 "u8" | "i8" => quote! { TinyInteger },
@@ -229,16 +229,24 @@ pub fn expand_derive_entity_model(data: Data, attrs: Vec<Attribute>) -> syn::Res
                                 "Decimal" => quote! { Decimal(None) },
                                 "Vec<u8>" => quote! { Binary },
                                 _ => {
-                                    return Err(Error::new(
+                                    // Assumed it's ActiveEnum if none of the above type matches
-                                        field.span(),
+                                    quote! {}
-                                        format!("unrecognized type {}", temp),
-                                    ))
                                 }
+                            };
+                            if col_type.is_empty() {
+                                let field_span = field.span();
+                                let ty = format_ident!("{}", temp);
+                                let def = quote_spanned! { field_span => {
+                                    <#ty as ActiveEnum>::db_type()
+                                }};
+                                quote! { #def }
+                            } else {
+                                quote! { sea_orm::prelude::ColumnType::#col_type.def() }
                             }
                         }
                     };
 
-                    let mut match_row = quote! { Self::#field_name => sea_orm::prelude::ColumnType::#field_type.def() };
+                    let mut match_row = quote! { Self::#field_name => #col_type };
                     if nullable {
                         match_row = quote! { #match_row.nullable() };
                     }

sea-orm-macros/src/derives/mod.rs

@@ -1,3 +1,4 @@
+mod active_enum;
 mod active_model;
 mod active_model_behavior;
 mod column;
@@ -9,6 +10,7 @@ mod model;
 mod primary_key;
 mod relation;
 
+pub use active_enum::*;
 pub use active_model::*;
 pub use active_model_behavior::*;
 pub use column::*;

sea-orm-macros/src/lib.rs

@@ -492,6 +492,41 @@ pub fn derive_active_model_behavior(input: TokenStream) -> TokenStream {
     }
 }
 
+/// A derive macro to implement `sea_orm::ActiveEnum` trait for enums.
+///
+/// # Limitations
+///
+/// This derive macros can only be used on enums.
+///
+/// # Macro Attributes
+///
+/// All macro attributes listed below have to be annotated in the form of `#[sea_orm(attr = value)]`.
+///
+/// - For enum
+///     - `rs_type`: Define `ActiveEnum::Value`
+///         - Possible values: `String`, `i8`, `i16`, `i32`, `i64`, `u8`, `u16`, `u32`, `u64`
+///         - Note that value has to be passed as string, i.e. `rs_type = "i8"`
+///     - `db_type`: Define `ColumnType` returned by `ActiveEnum::db_type()`
+///         - Possible values: all available enum variants of `ColumnType`, e.g. `String(None)`, `String(Some(1))`, `Integer`
+///         - Note that value has to be passed as string, i.e. `db_type = "Integer"`
+///     - `enum_name`: Define `String` returned by `ActiveEnum::name()`
+///         - This attribute is optional with default value being the name of enum in camel-case
+///         - Note that value has to be passed as string, i.e. `db_type = "Integer"`
+///
+/// - For enum variant
+///     - `string_value` or `num_value`:
+///         - For `string_value`, value should be passed as string, i.e. `string_value = "A"`
+///         - For `num_value`, value should be passed as integer, i.e. `num_value = 1` or `num_value = 1i32`
+///         - Note that only one of it can be specified, and all variants of an enum have to annotate with the same `*_value` macro attribute
+#[proc_macro_derive(DeriveActiveEnum, attributes(sea_orm))]
+pub fn derive_active_enum(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+    match derives::expand_derive_active_enum(input) {
+        Ok(ts) => ts.into(),
+        Err(e) => e.to_compile_error().into(),
+    }
+}
+
 /// Convert a query result into the corresponding Model.
 ///
 /// ### Usage

src/database/statement.rs

@@ -82,6 +82,15 @@ macro_rules! build_any_stmt {
     };
 }
 
+macro_rules! build_postgres_stmt {
+    ($stmt: expr, $db_backend: expr) => {
+        match $db_backend {
+            DbBackend::Postgres => $stmt.to_string(PostgresQueryBuilder),
+            DbBackend::MySql | DbBackend::Sqlite => unimplemented!(),
+        }
+    };
+}
+
 macro_rules! build_query_stmt {
     ($stmt: ty) => {
         impl StatementBuilder for $stmt {
@@ -114,3 +123,18 @@ build_schema_stmt!(sea_query::TableDropStatement);
 build_schema_stmt!(sea_query::TableAlterStatement);
 build_schema_stmt!(sea_query::TableRenameStatement);
 build_schema_stmt!(sea_query::TableTruncateStatement);
+
+macro_rules! build_type_stmt {
+    ($stmt: ty) => {
+        impl StatementBuilder for $stmt {
+            fn build(&self, db_backend: &DbBackend) -> Statement {
+                let stmt = build_postgres_stmt!(self, db_backend);
+                Statement::from_string(*db_backend, stmt)
+            }
+        }
+    };
+}
+
+build_type_stmt!(sea_query::extension::postgres::TypeAlterStatement);
+build_type_stmt!(sea_query::extension::postgres::TypeCreateStatement);
+build_type_stmt!(sea_query::extension::postgres::TypeDropStatement);

src/entity/active_enum.rs

@@ -0,0 +1,308 @@
+use crate::{ColumnDef, DbErr, Iterable, TryGetable};
+use sea_query::{Nullable, Value, ValueType};
+
+/// A Rust representation of enum defined in database.
+///
+/// # Implementations
+///
+/// You can implement [ActiveEnum] manually by hand or use the derive macro [DeriveActiveEnum](sea_orm_macros::DeriveActiveEnum).
+///
+/// # Examples
+///
+/// Implementing it manually versus using the derive macro [DeriveActiveEnum](sea_orm_macros::DeriveActiveEnum).
+///
+/// > See [DeriveActiveEnum](sea_orm_macros::DeriveActiveEnum) for the full specification of macro attributes.
+///
+/// ```rust
+/// use sea_orm::entity::prelude::*;
+///
+/// // Using the derive macro
+/// #[derive(Debug, PartialEq, EnumIter, DeriveActiveEnum)]
+/// #[sea_orm(
+///     rs_type = "String",
+///     db_type = "String(Some(1))",
+///     enum_name = "category"
+/// )]
+/// pub enum DeriveCategory {
+///     #[sea_orm(string_value = "B")]
+///     Big,
+///     #[sea_orm(string_value = "S")]
+///     Small,
+/// }
+///
+/// // Implementing it manually
+/// #[derive(Debug, PartialEq, EnumIter)]
+/// pub enum Category {
+///     Big,
+///     Small,
+/// }
+///
+/// impl ActiveEnum for Category {
+///     // The macro attribute `rs_type` is being pasted here
+///     type Value = String;
+///
+///     // Will be atomically generated by `DeriveActiveEnum`
+///     fn name() -> String {
+///         "category".to_owned()
+///     }
+///
+///     // Will be atomically generated by `DeriveActiveEnum`
+///     fn to_value(&self) -> Self::Value {
+///         match self {
+///             Self::Big => "B",
+///             Self::Small => "S",
+///         }
+///         .to_owned()
+///     }
+///
+///     // Will be atomically generated by `DeriveActiveEnum`
+///     fn try_from_value(v: &Self::Value) -> Result<Self, DbErr> {
+///         match v.as_ref() {
+///             "B" => Ok(Self::Big),
+///             "S" => Ok(Self::Small),
+///             _ => Err(DbErr::Type(format!(
+///                 "unexpected value for Category enum: {}",
+///                 v
+///             ))),
+///         }
+///     }
+///
+///     fn db_type() -> ColumnDef {
+///         // The macro attribute `db_type` is being pasted here
+///         ColumnType::String(Some(1)).def()
+///     }
+/// }
+/// ```
+///
+/// Using [ActiveEnum] on Model.
+///
+/// ```
+/// use sea_orm::entity::prelude::*;
+///
+/// // Define the `Category` active enum
+/// #[derive(Debug, Clone, PartialEq, EnumIter, DeriveActiveEnum)]
+/// #[sea_orm(rs_type = "String", db_type = "String(Some(1))")]
+/// pub enum Category {
+///     #[sea_orm(string_value = "B")]
+///     Big,
+///     #[sea_orm(string_value = "S")]
+///     Small,
+/// }
+///
+/// #[derive(Clone, Debug, PartialEq, DeriveEntityModel)]
+/// #[sea_orm(table_name = "active_enum")]
+/// pub struct Model {
+///     #[sea_orm(primary_key)]
+///     pub id: i32,
+///     // Represents a db column using `Category` active enum
+///     pub category: Category,
+///     pub category_opt: Option<Category>,
+/// }
+///
+/// #[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+/// pub enum Relation {}
+///
+/// impl ActiveModelBehavior for ActiveModel {}
+/// ```
+pub trait ActiveEnum: Sized + Iterable {
+    /// Define the Rust type that each enum variant represents.
+    type Value: Into<Value> + ValueType + Nullable + TryGetable;
+
+    /// Get the name of enum
+    fn name() -> String;
+
+    /// Convert enum variant into the corresponding value.
+    fn to_value(&self) -> Self::Value;
+
+    /// Try to convert the corresponding value into enum variant.
+    fn try_from_value(v: &Self::Value) -> Result<Self, DbErr>;
+
+    /// Get the database column definition of this active enum.
+    fn db_type() -> ColumnDef;
+
+    /// Convert an owned enum variant into the corresponding value.
+    fn into_value(self) -> Self::Value {
+        Self::to_value(&self)
+    }
+
+    /// Get the name of all enum variants
+    fn values() -> Vec<Self::Value> {
+        Self::iter().map(Self::into_value).collect()
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate as sea_orm;
+    use crate::{entity::prelude::*, *};
+    use pretty_assertions::assert_eq;
+
+    #[test]
+    fn active_enum_string() {
+        #[derive(Debug, PartialEq, EnumIter)]
+        pub enum Category {
+            Big,
+            Small,
+        }
+
+        impl ActiveEnum for Category {
+            type Value = String;
+
+            fn name() -> String {
+                "category".to_owned()
+            }
+
+            fn to_value(&self) -> Self::Value {
+                match self {
+                    Self::Big => "B",
+                    Self::Small => "S",
+                }
+                .to_owned()
+            }
+
+            fn try_from_value(v: &Self::Value) -> Result<Self, DbErr> {
+                match v.as_ref() {
+                    "B" => Ok(Self::Big),
+                    "S" => Ok(Self::Small),
+                    _ => Err(DbErr::Type(format!(
+                        "unexpected value for Category enum: {}",
+                        v
+                    ))),
+                }
+            }
+
+            fn db_type() -> ColumnDef {
+                ColumnType::String(Some(1)).def()
+            }
+        }
+
+        #[derive(Debug, PartialEq, EnumIter, DeriveActiveEnum)]
+        #[sea_orm(
+            rs_type = "String",
+            db_type = "String(Some(1))",
+            enum_name = "category"
+        )]
+        pub enum DeriveCategory {
+            #[sea_orm(string_value = "B")]
+            Big,
+            #[sea_orm(string_value = "S")]
+            Small,
+        }
+
+        assert_eq!(Category::Big.to_value(), "B".to_owned());
+        assert_eq!(Category::Small.to_value(), "S".to_owned());
+        assert_eq!(DeriveCategory::Big.to_value(), "B".to_owned());
+        assert_eq!(DeriveCategory::Small.to_value(), "S".to_owned());
+
+        assert_eq!(
+            Category::try_from_value(&"A".to_owned()).err(),
+            Some(DbErr::Type(
+                "unexpected value for Category enum: A".to_owned()
+            ))
+        );
+        assert_eq!(
+            Category::try_from_value(&"B".to_owned()).ok(),
+            Some(Category::Big)
+        );
+        assert_eq!(
+            Category::try_from_value(&"S".to_owned()).ok(),
+            Some(Category::Small)
+        );
+        assert_eq!(
+            DeriveCategory::try_from_value(&"A".to_owned()).err(),
+            Some(DbErr::Type(
+                "unexpected value for DeriveCategory enum: A".to_owned()
+            ))
+        );
+        assert_eq!(
+            DeriveCategory::try_from_value(&"B".to_owned()).ok(),
+            Some(DeriveCategory::Big)
+        );
+        assert_eq!(
+            DeriveCategory::try_from_value(&"S".to_owned()).ok(),
+            Some(DeriveCategory::Small)
+        );
+
+        assert_eq!(Category::db_type(), ColumnType::String(Some(1)).def());
+        assert_eq!(DeriveCategory::db_type(), ColumnType::String(Some(1)).def());
+
+        assert_eq!(Category::name(), DeriveCategory::name());
+        assert_eq!(Category::values(), DeriveCategory::values());
+    }
+
+    #[test]
+    fn active_enum_derive_signed_integers() {
+        macro_rules! test_int {
+            ($ident: ident, $rs_type: expr, $db_type: expr, $col_def: ident) => {
+                #[derive(Debug, PartialEq, EnumIter, DeriveActiveEnum)]
+                #[sea_orm(rs_type = $rs_type, db_type = $db_type)]
+                pub enum $ident {
+                    #[sea_orm(num_value = 1)]
+                    Big,
+                    #[sea_orm(num_value = 0)]
+                    Small,
+                    #[sea_orm(num_value = -10)]
+                    Negative,
+                }
+
+                assert_eq!($ident::Big.to_value(), 1);
+                assert_eq!($ident::Small.to_value(), 0);
+                assert_eq!($ident::Negative.to_value(), -10);
+
+                assert_eq!($ident::try_from_value(&1).ok(), Some($ident::Big));
+                assert_eq!($ident::try_from_value(&0).ok(), Some($ident::Small));
+                assert_eq!($ident::try_from_value(&-10).ok(), Some($ident::Negative));
+                assert_eq!(
+                    $ident::try_from_value(&2).err(),
+                    Some(DbErr::Type(format!(
+                        "unexpected value for {} enum: 2",
+                        stringify!($ident)
+                    )))
+                );
+
+                assert_eq!($ident::db_type(), ColumnType::$col_def.def());
+            };
+        }
+
+        test_int!(I8, "i8", "TinyInteger", TinyInteger);
+        test_int!(I16, "i16", "SmallInteger", SmallInteger);
+        test_int!(I32, "i32", "Integer", Integer);
+        test_int!(I64, "i64", "BigInteger", BigInteger);
+    }
+
+    #[test]
+    fn active_enum_derive_unsigned_integers() {
+        macro_rules! test_uint {
+            ($ident: ident, $rs_type: expr, $db_type: expr, $col_def: ident) => {
+                #[derive(Debug, PartialEq, EnumIter, DeriveActiveEnum)]
+                #[sea_orm(rs_type = $rs_type, db_type = $db_type)]
+                pub enum $ident {
+                    #[sea_orm(num_value = 1)]
+                    Big,
+                    #[sea_orm(num_value = 0)]
+                    Small,
+                }
+
+                assert_eq!($ident::Big.to_value(), 1);
+                assert_eq!($ident::Small.to_value(), 0);
+
+                assert_eq!($ident::try_from_value(&1).ok(), Some($ident::Big));
+                assert_eq!($ident::try_from_value(&0).ok(), Some($ident::Small));
+                assert_eq!(
+                    $ident::try_from_value(&2).err(),
+                    Some(DbErr::Type(format!(
+                        "unexpected value for {} enum: 2",
+                        stringify!($ident)
+                    )))
+                );
+
+                assert_eq!($ident::db_type(), ColumnType::$col_def.def());
+            };
+        }
+
+        test_uint!(U8, "u8", "TinyInteger", TinyInteger);
+        test_uint!(U16, "u16", "SmallInteger", SmallInteger);
+        test_uint!(U32, "u32", "Integer", Integer);
+        test_uint!(U64, "u64", "BigInteger", BigInteger);
+    }
+}

src/entity/column.rs

@@ -1,5 +1,5 @@
 use crate::{EntityName, IdenStatic, Iterable};
-use sea_query::{DynIden, Expr, SeaRc, SelectStatement, SimpleExpr, Value};
+use sea_query::{Alias, BinOper, DynIden, Expr, SeaRc, SelectStatement, SimpleExpr, Value};
 use std::str::FromStr;
 
 /// Defines a Column for an Entity
@@ -62,6 +62,8 @@ pub enum ColumnType {
     Custom(String),
     /// A Universally Unique IDentifier that is specified in  RFC 4122
     Uuid,
+    /// `ENUM` data type with name and variants
+    Enum(String, Vec<String>),
 }
 
 macro_rules! bind_oper {
@@ -76,6 +78,25 @@ macro_rules! bind_oper {
     };
 }
 
+macro_rules! bind_oper_with_enum_casting {
+    ( $op: ident, $bin_op: ident ) => {
+        #[allow(missing_docs)]
+        fn $op<V>(&self, v: V) -> SimpleExpr
+        where
+            V: Into<Value>,
+        {
+            let val = Expr::val(v);
+            let col_def = self.def();
+            let col_type = col_def.get_column_type();
+            let expr = match col_type.get_enum_name() {
+                Some(enum_name) => val.as_enum(Alias::new(enum_name)),
+                None => val.into(),
+            };
+            Expr::tbl(self.entity_name(), *self).binary(BinOper::$bin_op, expr)
+        }
+    };
+}
+
 macro_rules! bind_func_no_params {
     ( $func: ident ) => {
         /// See also SeaQuery's method with same name.
@@ -128,8 +149,8 @@ pub trait ColumnTrait: IdenStatic + Iterable + FromStr {
         (self.entity_name(), SeaRc::new(*self) as DynIden)
     }
 
-    bind_oper!(eq);
+    bind_oper_with_enum_casting!(eq, Equal);
-    bind_oper!(ne);
+    bind_oper_with_enum_casting!(ne, NotEqual);
     bind_oper!(gt);
     bind_oper!(gte);
     bind_oper!(lt);
@@ -281,6 +302,13 @@ impl ColumnType {
             indexed: false,
         }
     }
+
+    pub(crate) fn get_enum_name(&self) -> Option<&String> {
+        match self {
+            ColumnType::Enum(s, _) => Some(s),
+            _ => None,
+        }
+    }
 }
 
 impl ColumnDef {
@@ -306,6 +334,11 @@ impl ColumnDef {
         self.indexed = true;
         self
     }
+
+    /// Get [ColumnType] as reference
+    pub fn get_column_type(&self) -> &ColumnType {
+        &self.col_type
+    }
 }
 
 impl From<ColumnType> for sea_query::ColumnType {
@@ -331,7 +364,7 @@ impl From<ColumnType> for sea_query::ColumnType {
             ColumnType::Money(s) => sea_query::ColumnType::Money(s),
             ColumnType::Json => sea_query::ColumnType::Json,
             ColumnType::JsonBinary => sea_query::ColumnType::JsonBinary,
-            ColumnType::Custom(s) => {
+            ColumnType::Custom(s) | ColumnType::Enum(s, _) => {
                 sea_query::ColumnType::Custom(sea_query::SeaRc::new(sea_query::Alias::new(&s)))
             }
             ColumnType::Uuid => sea_query::ColumnType::Uuid,

src/entity/mod.rs

@@ -95,6 +95,7 @@
 /// // to create an ActiveModel using the [ActiveModelBehavior]
 /// impl ActiveModelBehavior for ActiveModel {}
 /// ```
+mod active_enum;
 mod active_model;
 mod base_entity;
 mod column;
@@ -106,6 +107,7 @@ pub mod prelude;
 mod primary_key;
 mod relation;
 
+pub use active_enum::*;
 pub use active_model::*;
 pub use base_entity::*;
 pub use column::*;

src/entity/prelude.rs

@@ -1,14 +1,15 @@
 pub use crate::{
-    error::*, ActiveModelBehavior, ActiveModelTrait, ColumnDef, ColumnTrait, ColumnType,
+    error::*, ActiveEnum, ActiveModelBehavior, ActiveModelTrait, ColumnDef, ColumnTrait,
-    DatabaseConnection, DbConn, EntityName, EntityTrait, EnumIter, ForeignKeyAction, Iden,
+    ColumnType, DatabaseConnection, DbConn, EntityName, EntityTrait, EnumIter, ForeignKeyAction,
-    IdenStatic, Linked, ModelTrait, PrimaryKeyToColumn, PrimaryKeyTrait, QueryFilter, QueryResult,
+    Iden, IdenStatic, Linked, ModelTrait, PrimaryKeyToColumn, PrimaryKeyTrait, QueryFilter,
-    Related, RelationDef, RelationTrait, Select, Value,
+    QueryResult, Related, RelationDef, RelationTrait, Select, Value,
 };
 
 #[cfg(feature = "macros")]
 pub use crate::{
-    DeriveActiveModel, DeriveActiveModelBehavior, DeriveColumn, DeriveCustomColumn, DeriveEntity,
+    DeriveActiveEnum, DeriveActiveModel, DeriveActiveModelBehavior, DeriveColumn,
-    DeriveEntityModel, DeriveIntoActiveModel, DeriveModel, DerivePrimaryKey, DeriveRelation,
+    DeriveCustomColumn, DeriveEntity, DeriveEntityModel, DeriveIntoActiveModel, DeriveModel,
+    DerivePrimaryKey, DeriveRelation,
 };
 
 #[cfg(feature = "with-json")]

src/error.rs

@@ -11,6 +11,8 @@ pub enum DbErr {
     RecordNotFound(String),
     /// A custom error
     Custom(String),
+    /// Error occurred while parsing value as target type
+    Type(String),
 }
 
 impl std::error::Error for DbErr {}
@@ -23,6 +25,7 @@ impl std::fmt::Display for DbErr {
             Self::Query(s) => write!(f, "Query Error: {}", s),
             Self::RecordNotFound(s) => write!(f, "RecordNotFound Error: {}", s),
             Self::Custom(s) => write!(f, "Custom Error: {}", s),
+            Self::Type(s) => write!(f, "Type Error: {}", s),
         }
     }
 }

src/lib.rs

@@ -27,9 +27,10 @@
 //! #### SeaORM is a relational ORM to help you build light weight and concurrent web services in Rust.
 //!
 //! [![Getting Started](https://img.shields.io/badge/Getting%20Started-brightgreen)](https://www.sea-ql.org/SeaORM/docs/index)
-//! [![Usage Example](https://img.shields.io/badge/Usage%20Example-yellow)](https://github.com/SeaQL/sea-orm/tree/master/examples/basic)
+//! [![Usage Example](https://img.shields.io/badge/Usage%20Example-green)](https://github.com/SeaQL/sea-orm/tree/master/examples/basic)
+//! [![Rocket Example](https://img.shields.io/badge/Rocket%20Example-red)](https://github.com/SeaQL/sea-orm/tree/master/examples/rocket_example)
 //! [![Actix Example](https://img.shields.io/badge/Actix%20Example-blue)](https://github.com/SeaQL/sea-orm/tree/master/examples/actix_example)
-//! [![Rocket Example](https://img.shields.io/badge/Rocket%20Example-orange)](https://github.com/SeaQL/sea-orm/tree/master/examples/rocket_example)
+//! [![Axum Example](https://img.shields.io/badge/Axum%20Example-yellow)](https://github.com/SeaQL/sea-orm/tree/master/examples/axum_example)
 //! [![Discord](https://img.shields.io/discord/873880840487206962?label=Discord)](https://discord.com/invite/uCPdDXzbdv)
 //!
 //! ## Features
@@ -292,9 +293,9 @@ pub use schema::*;
 
 #[cfg(feature = "macros")]
 pub use sea_orm_macros::{
-    DeriveActiveModel, DeriveActiveModelBehavior, DeriveColumn, DeriveCustomColumn, DeriveEntity,
+    DeriveActiveEnum, DeriveActiveModel, DeriveActiveModelBehavior, DeriveColumn,
-    DeriveEntityModel, DeriveIntoActiveModel, DeriveModel, DerivePrimaryKey, DeriveRelation,
+    DeriveCustomColumn, DeriveEntity, DeriveEntityModel, DeriveIntoActiveModel, DeriveModel,
-    FromQueryResult,
+    DerivePrimaryKey, DeriveRelation, FromQueryResult,
 };
 
 pub use sea_query;

src/query/insert.rs

@@ -1,9 +1,9 @@
 use crate::{
-    ActiveModelTrait, EntityName, EntityTrait, IntoActiveModel, Iterable, PrimaryKeyTrait,
+    ActiveModelTrait, ColumnTrait, EntityName, EntityTrait, IntoActiveModel, Iterable,
-    QueryTrait,
+    PrimaryKeyTrait, QueryTrait,
 };
 use core::marker::PhantomData;
-use sea_query::{InsertStatement, ValueTuple};
+use sea_query::{Alias, Expr, InsertStatement, ValueTuple};
 
 /// Performs INSERT operations on a ActiveModel
 #[derive(Debug)]
@@ -133,11 +133,18 @@ where
             }
             if av_has_val {
                 columns.push(col);
-                values.push(av.into_value().unwrap());
+                let val = Expr::val(av.into_value().unwrap());
+                let col_def = col.def();
+                let col_type = col_def.get_column_type();
+                let expr = match col_type.get_enum_name() {
+                    Some(enum_name) => val.as_enum(Alias::new(enum_name)),
+                    None => val.into(),
+                };
+                values.push(expr);
             }
         }
         self.query.columns(columns);
-        self.query.values_panic(values);
+        self.query.exprs_panic(values);
         self
     }
 

src/query/select.rs

@@ -2,7 +2,7 @@ use crate::{ColumnTrait, EntityTrait, Iterable, QueryFilter, QueryOrder, QuerySe
 use core::fmt::Debug;
 use core::marker::PhantomData;
 pub use sea_query::JoinType;
-use sea_query::{DynIden, IntoColumnRef, SeaRc, SelectStatement, SimpleExpr};
+use sea_query::{Alias, DynIden, Expr, IntoColumnRef, SeaRc, SelectStatement, SimpleExpr};
 
 /// Defines a structure to perform select operations
 #[derive(Clone, Debug)]
@@ -114,13 +114,24 @@ where
     }
 
     fn prepare_select(mut self) -> Self {
-        self.query.columns(self.column_list());
+        self.query.exprs(self.column_list());
         self
     }
 
-    fn column_list(&self) -> Vec<(DynIden, E::Column)> {
+    fn column_list(&self) -> Vec<SimpleExpr> {
         let table = SeaRc::new(E::default()) as DynIden;
-        E::Column::iter().map(|col| (table.clone(), col)).collect()
+        let text_type = SeaRc::new(Alias::new("text")) as DynIden;
+        E::Column::iter()
+            .map(|col| {
+                let expr = Expr::tbl(table.clone(), col);
+                let col_def = col.def();
+                let col_type = col_def.get_column_type();
+                match col_type.get_enum_name() {
+                    Some(_) => expr.as_enum(text_type.clone()),
+                    None => expr.into(),
+                }
+            })
+            .collect()
     }
 
     fn prepare_from(mut self) -> Self {

src/query/update.rs

@@ -3,7 +3,7 @@ use crate::{
     QueryTrait,
 };
 use core::marker::PhantomData;
-use sea_query::{IntoIden, SimpleExpr, UpdateStatement};
+use sea_query::{Alias, Expr, IntoIden, SimpleExpr, UpdateStatement};
 
 /// Defines a structure to perform UPDATE query operations on a ActiveModel
 #[derive(Clone, Debug)]
@@ -109,7 +109,14 @@ where
             }
             let av = self.model.get(col);
             if av.is_set() {
-                self.query.value(col, av.unwrap());
+                let val = Expr::val(av.into_value().unwrap());
+                let col_def = col.def();
+                let col_type = col_def.get_column_type();
+                let expr = match col_type.get_enum_name() {
+                    Some(enum_name) => val.as_enum(Alias::new(enum_name)),
+                    None => val.into(),
+                };
+                self.query.value_expr(col, expr);
             }
         }
         self

src/schema/entity.rs

@@ -1,20 +1,58 @@
 use crate::{
-    unpack_table_ref, ColumnTrait, EntityTrait, Identity, Iterable, PrimaryKeyToColumn,
+    unpack_table_ref, ColumnTrait, ColumnType, DbBackend, EntityTrait, Identity, Iterable,
-    PrimaryKeyTrait, RelationTrait, Schema,
+    PrimaryKeyToColumn, PrimaryKeyTrait, RelationTrait, Schema,
+};
+use sea_query::{
+    extension::postgres::{Type, TypeCreateStatement},
+    Alias, ColumnDef, ForeignKeyCreateStatement, Iden, Index, TableCreateStatement,
 };
-use sea_query::{ColumnDef, ForeignKeyCreateStatement, Iden, Index, TableCreateStatement};
 
 impl Schema {
-    /// Creates a table from an Entity. See [TableCreateStatement] for more details
+    /// Creates Postgres enums from an Entity. See [TypeCreateStatement] for more details
-    pub fn create_table_from_entity<E>(entity: E) -> TableCreateStatement
+    pub fn create_enum_from_entity<E>(entity: E, db_backend: DbBackend) -> Vec<TypeCreateStatement>
     where
         E: EntityTrait,
     {
-        create_table_from_entity(entity)
+        create_enum_from_entity(entity, db_backend)
+    }
+
+    /// Creates a table from an Entity. See [TableCreateStatement] for more details
+    pub fn create_table_from_entity<E>(entity: E, db_backend: DbBackend) -> TableCreateStatement
+    where
+        E: EntityTrait,
+    {
+        create_table_from_entity(entity, db_backend)
     }
 }
 
-pub(crate) fn create_table_from_entity<E>(entity: E) -> TableCreateStatement
+pub(crate) fn create_enum_from_entity<E>(_: E, db_backend: DbBackend) -> Vec<TypeCreateStatement>
+where
+    E: EntityTrait,
+{
+    if matches!(db_backend, DbBackend::MySql | DbBackend::Sqlite) {
+        return Vec::new();
+    }
+    let mut vec = Vec::new();
+    for col in E::Column::iter() {
+        let col_def = col.def();
+        let col_type = col_def.get_column_type();
+        if !matches!(col_type, ColumnType::Enum(_, _)) {
+            continue;
+        }
+        let (name, values) = match col_type {
+            ColumnType::Enum(s, v) => (s.as_str(), v),
+            _ => unreachable!(),
+        };
+        let stmt = Type::create()
+            .as_enum(Alias::new(name))
+            .values(values.iter().map(|val| Alias::new(val.as_str())))
+            .to_owned();
+        vec.push(stmt);
+    }
+    vec
+}
+
+pub(crate) fn create_table_from_entity<E>(entity: E, db_backend: DbBackend) -> TableCreateStatement
 where
     E: EntityTrait,
 {
@@ -22,7 +60,17 @@ where
 
     for column in E::Column::iter() {
         let orm_column_def = column.def();
-        let types = orm_column_def.col_type.into();
+        let types = match orm_column_def.col_type {
+            ColumnType::Enum(s, variants) => match db_backend {
+                DbBackend::MySql => {
+                    ColumnType::Custom(format!("ENUM('{}')", variants.join("', '")))
+                }
+                DbBackend::Postgres => ColumnType::Custom(s),
+                DbBackend::Sqlite => ColumnType::Text,
+            }
+            .into(),
+            _ => orm_column_def.col_type.into(),
+        };
         let mut column_def = ColumnDef::new_with_type(column, types);
         if !orm_column_def.null {
             column_def.not_null();
@@ -122,13 +170,14 @@ where
 
 #[cfg(test)]
 mod tests {
-    use crate::{sea_query::*, tests_cfg::*, Schema};
+    use crate::{sea_query::*, tests_cfg::*, DbBackend, Schema};
     use pretty_assertions::assert_eq;
 
     #[test]
     fn test_create_table_from_entity() {
         assert_eq!(
-            Schema::create_table_from_entity(CakeFillingPrice).to_string(MysqlQueryBuilder),
+            Schema::create_table_from_entity(CakeFillingPrice, DbBackend::MySql)
+                .to_string(MysqlQueryBuilder),
             Table::create()
                 .table(CakeFillingPrice)
                 .col(

tests/active_enum_tests.rs

@@ -0,0 +1,92 @@
+pub mod common;
+
+pub use common::{features::*, setup::*, TestContext};
+use sea_orm::{entity::prelude::*, entity::*, DatabaseConnection};
+
+#[sea_orm_macros::test]
+#[cfg(any(
+    feature = "sqlx-mysql",
+    feature = "sqlx-sqlite",
+    feature = "sqlx-postgres"
+))]
+async fn main() -> Result<(), DbErr> {
+    let ctx = TestContext::new("active_enum_tests").await;
+    create_tables(&ctx.db).await?;
+    insert_active_enum(&ctx.db).await?;
+    ctx.delete().await;
+
+    Ok(())
+}
+
+pub async fn insert_active_enum(db: &DatabaseConnection) -> Result<(), DbErr> {
+    use active_enum::*;
+
+    let am = ActiveModel {
+        category: Set(None),
+        color: Set(None),
+        tea: Set(None),
+        ..Default::default()
+    }
+    .insert(db)
+    .await?;
+
+    let model = Entity::find().one(db).await?.unwrap();
+    assert_eq!(
+        model,
+        Model {
+            id: 1,
+            category: None,
+            color: None,
+            tea: None,
+        }
+    );
+    assert_eq!(
+        model,
+        Entity::find()
+            .filter(Column::Id.is_not_null())
+            .filter(Column::Category.is_null())
+            .filter(Column::Color.is_null())
+            .filter(Column::Tea.is_null())
+            .one(db)
+            .await?
+            .unwrap()
+    );
+
+    let am = ActiveModel {
+        category: Set(Some(Category::Big)),
+        color: Set(Some(Color::Black)),
+        tea: Set(Some(Tea::EverydayTea)),
+        ..am
+    }
+    .save(db)
+    .await?;
+
+    let model = Entity::find().one(db).await?.unwrap();
+    assert_eq!(
+        model,
+        Model {
+            id: 1,
+            category: Some(Category::Big),
+            color: Some(Color::Black),
+            tea: Some(Tea::EverydayTea),
+        }
+    );
+    assert_eq!(
+        model,
+        Entity::find()
+            .filter(Column::Id.eq(1))
+            .filter(Column::Category.eq(Category::Big))
+            .filter(Column::Color.eq(Color::Black))
+            .filter(Column::Tea.eq(Tea::EverydayTea))
+            .one(db)
+            .await?
+            .unwrap()
+    );
+
+    let res = am.delete(db).await?;
+
+    assert_eq!(res.rows_affected, 1);
+    assert_eq!(Entity::find().one(db).await?, None);
+
+    Ok(())
+}

tests/common/features/active_enum.rs

@@ -0,0 +1,43 @@
+use sea_orm::entity::prelude::*;
+
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel)]
+#[sea_orm(table_name = "active_enum")]
+pub struct Model {
+    #[sea_orm(primary_key)]
+    pub id: i32,
+    pub category: Option<Category>,
+    pub color: Option<Color>,
+    pub tea: Option<Tea>,
+}
+
+#[derive(Copy, Clone, Debug, EnumIter, DeriveRelation)]
+pub enum Relation {}
+
+impl ActiveModelBehavior for ActiveModel {}
+
+#[derive(Debug, Clone, PartialEq, EnumIter, DeriveActiveEnum)]
+#[sea_orm(rs_type = "String", db_type = "String(Some(1))")]
+pub enum Category {
+    #[sea_orm(string_value = "B")]
+    Big,
+    #[sea_orm(string_value = "S")]
+    Small,
+}
+
+#[derive(Debug, Clone, PartialEq, EnumIter, DeriveActiveEnum)]
+#[sea_orm(rs_type = "i32", db_type = r#"Integer"#)]
+pub enum Color {
+    #[sea_orm(num_value = 0)]
+    Black,
+    #[sea_orm(num_value = 1)]
+    White,
+}
+
+#[derive(Debug, Clone, PartialEq, EnumIter, DeriveActiveEnum)]
+#[sea_orm(rs_type = "String", db_type = "Enum", enum_name = "tea")]
+pub enum Tea {
+    #[sea_orm(string_value = "EverydayTea")]
+    EverydayTea,
+    #[sea_orm(string_value = "BreakfastTea")]
+    BreakfastTea,
+}

tests/common/features/mod.rs

@@ -1,3 +1,4 @@
+pub mod active_enum;
 pub mod applog;
 pub mod byte_primary_key;
 pub mod metadata;
@@ -5,6 +6,7 @@ pub mod repository;
 pub mod schema;
 pub mod self_join;
 
+pub use active_enum::Entity as ActiveEnum;
 pub use applog::Entity as Applog;
 pub use byte_primary_key::Entity as BytePrimaryKey;
 pub use metadata::Entity as Metadata;

tests/common/features/schema.rs

@@ -1,11 +1,11 @@
 pub use super::super::bakery_chain::*;
 
 use super::*;
-use crate::common::setup::{create_table, create_table_without_asserts};
+use crate::common::setup::{create_enum, create_table, create_table_without_asserts};
 use sea_orm::{
     error::*, sea_query, ConnectionTrait, DatabaseConnection, DbBackend, DbConn, ExecResult,
 };
-use sea_query::{ColumnDef, ForeignKeyCreateStatement};
+use sea_query::{extension::postgres::Type, Alias, ColumnDef, ForeignKeyCreateStatement};
 
 pub async fn create_tables(db: &DatabaseConnection) -> Result<(), DbErr> {
     create_log_table(db).await?;
@@ -13,6 +13,7 @@ pub async fn create_tables(db: &DatabaseConnection) -> Result<(), DbErr> {
     create_repository_table(db).await?;
     create_self_join_table(db).await?;
     create_byte_primary_key_table(db).await?;
+    create_active_enum_table(db).await?;
 
     Ok(())
 }
@@ -123,3 +124,40 @@ pub async fn create_byte_primary_key_table(db: &DbConn) -> Result<ExecResult, Db
 
     create_table_without_asserts(db, &stmt).await
 }
+
+pub async fn create_active_enum_table(db: &DbConn) -> Result<ExecResult, DbErr> {
+    let db_backend = db.get_database_backend();
+    let tea_enum = Alias::new("tea");
+
+    let create_enum_stmts = match db_backend {
+        DbBackend::MySql | DbBackend::Sqlite => Vec::new(),
+        DbBackend::Postgres => vec![Type::create()
+            .as_enum(tea_enum.clone())
+            .values(vec![Alias::new("EverydayTea"), Alias::new("BreakfastTea")])
+            .to_owned()],
+    };
+
+    create_enum(db, &create_enum_stmts, ActiveEnum).await?;
+
+    let mut tea_col = ColumnDef::new(active_enum::Column::Tea);
+    match db_backend {
+        DbBackend::MySql => tea_col.custom(Alias::new("ENUM('EverydayTea', 'BreakfastTea')")),
+        DbBackend::Sqlite => tea_col.text(),
+        DbBackend::Postgres => tea_col.custom(tea_enum),
+    };
+    let create_table_stmt = sea_query::Table::create()
+        .table(active_enum::Entity)
+        .col(
+            ColumnDef::new(active_enum::Column::Id)
+                .integer()
+                .not_null()
+                .auto_increment()
+                .primary_key(),
+        )
+        .col(ColumnDef::new(active_enum::Column::Category).string_len(1))
+        .col(ColumnDef::new(active_enum::Column::Color).integer())
+        .col(&mut tea_col)
+        .to_owned();
+
+    create_table(db, &create_table_stmt, ActiveEnum).await
+}

tests/common/setup/mod.rs

@@ -1,9 +1,12 @@
+use pretty_assertions::assert_eq;
 use sea_orm::{
-    ConnectionTrait, Database, DatabaseBackend, DatabaseConnection, DbBackend, DbConn, DbErr,
+    ColumnTrait, ColumnType, ConnectionTrait, Database, DatabaseBackend, DatabaseConnection,
-    EntityTrait, ExecResult, Schema, Statement,
+    DbBackend, DbConn, DbErr, EntityTrait, ExecResult, Iterable, Schema, Statement,
+};
+use sea_query::{
+    extension::postgres::{Type, TypeCreateStatement},
+    Alias, Table, TableCreateStatement,
 };
-
-use sea_query::{Alias, Table, TableCreateStatement};
 
 pub async fn setup(base_url: &str, db_name: &str) -> DatabaseConnection {
     let db = if cfg!(feature = "sqlx-mysql") {
@@ -74,6 +77,51 @@ pub async fn tear_down(base_url: &str, db_name: &str) {
     };
 }
 
+pub async fn create_enum<E>(
+    db: &DbConn,
+    creates: &[TypeCreateStatement],
+    entity: E,
+) -> Result<(), DbErr>
+where
+    E: EntityTrait,
+{
+    let builder = db.get_database_backend();
+    if builder == DbBackend::Postgres {
+        for col in E::Column::iter() {
+            let col_def = col.def();
+            let col_type = col_def.get_column_type();
+            if !matches!(col_type, ColumnType::Enum(_, _)) {
+                continue;
+            }
+            let name = match col_type {
+                ColumnType::Enum(s, _) => s.as_str(),
+                _ => unreachable!(),
+            };
+            let drop_type_stmt = Type::drop()
+                .name(Alias::new(name))
+                .if_exists()
+                .cascade()
+                .to_owned();
+            let stmt = builder.build(&drop_type_stmt);
+            db.execute(stmt).await?;
+        }
+    }
+
+    let expect_stmts: Vec<Statement> = creates.iter().map(|stmt| builder.build(stmt)).collect();
+    let create_from_entity_stmts: Vec<Statement> = Schema::create_enum_from_entity(entity, builder)
+        .iter()
+        .map(|stmt| builder.build(stmt))
+        .collect();
+
+    assert_eq!(expect_stmts, create_from_entity_stmts);
+
+    for stmt in expect_stmts {
+        db.execute(stmt).await.map(|_| ())?;
+    }
+
+    Ok(())
+}
+
 pub async fn create_table<E>(
     db: &DbConn,
     create: &TableCreateStatement,
@@ -84,7 +132,7 @@ where
 {
     let builder = db.get_database_backend();
     assert_eq!(
-        builder.build(&Schema::create_table_from_entity(entity)),
+        builder.build(&Schema::create_table_from_entity(entity, builder)),
         builder.build(create)
     );