Add derive DeriveIntoActiveModel

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

@@ -0,0 +1,101 @@
+use bae::FromAttributes;
+use proc_macro2::{Span, TokenStream};
+use quote::{quote, quote_spanned};
+
+#[derive(Default, FromAttributes)]
+pub struct SeaOrm {
+    pub active_model: Option<syn::Ident>,
+}
+
+enum Error {
+    InputNotStruct,
+    Syn(syn::Error),
+}
+
+struct IntoActiveModel {
+    attrs: SeaOrm,
+    fields: syn::punctuated::Punctuated<syn::Field, syn::token::Comma>,
+    field_idents: Vec<syn::Ident>,
+    ident: syn::Ident,
+}
+
+impl IntoActiveModel {
+    fn new(input: syn::DeriveInput) -> Result<Self, Error> {
+        let fields = match input.data {
+            syn::Data::Struct(syn::DataStruct {
+                fields: syn::Fields::Named(syn::FieldsNamed { named, .. }),
+                ..
+            }) => named,
+            _ => return Err(Error::InputNotStruct),
+        };
+
+        let attrs = SeaOrm::try_from_attributes(&input.attrs)
+            .map_err(Error::Syn)?
+            .unwrap_or_default();
+
+        let ident = input.ident;
+
+        let field_idents = fields
+            .iter()
+            .map(|field| field.ident.as_ref().unwrap().clone())
+            .collect();
+
+        Ok(IntoActiveModel {
+            attrs,
+            fields,
+            field_idents,
+            ident,
+        })
+    }
+
+    fn expand(&self) -> syn::Result<TokenStream> {
+        let expanded_impl_into_active_model = self.impl_into_active_model();
+
+        Ok(expanded_impl_into_active_model)
+    }
+
+    fn impl_into_active_model(&self) -> TokenStream {
+        let Self {
+            attrs,
+            ident,
+            field_idents,
+            fields,
+        } = self;
+
+        let active_model_ident = attrs
+            .active_model
+            .clone()
+            .unwrap_or_else(|| syn::Ident::new("ActiveModel", Span::call_site()));
+
+        let expanded_fields_into_active_model = fields.iter().map(|field| {
+            let field_ident = field.ident.as_ref().unwrap();
+
+            quote!(
+                ::sea_orm::IntoActiveValue::<_>::into_active_value(self.#field_ident).into()
+            )
+        });
+
+        quote!(
+            impl ::sea_orm::IntoActiveModel<#active_model_ident> for #ident {
+                fn into_active_model(self) -> #active_model_ident {
+                    #active_model_ident {
+                        #( #field_idents: #expanded_fields_into_active_model, )*
+                        ..::std::default::Default::default()
+                    }
+                }
+            }
+        )
+    }
+}
+
+pub fn expand_into_active_model(input: syn::DeriveInput) -> syn::Result<TokenStream> {
+    let ident_span = input.ident.span();
+
+    match IntoActiveModel::new(input) {
+        Ok(model) => model.expand(),
+        Err(Error::InputNotStruct) => Ok(quote_spanned! {
+            ident_span => compile_error!("you can only derive IntoActiveModel on structs");
+        }),
+        Err(Error::Syn(err)) => Err(err),
+    }
+}

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

@@ -4,6 +4,7 @@ mod column;
 mod entity;
 mod entity_model;
 mod from_query_result;
+mod into_active_model;
 mod model;
 mod primary_key;
 mod relation;
@@ -14,6 +15,7 @@ pub use column::*;
 pub use entity::*;
 pub use entity_model::*;
 pub use from_query_result::*;
+pub use into_active_model::*;
 pub use model::*;
 pub use primary_key::*;
 pub use relation::*;

sea-orm-macros/src/lib.rs

@@ -84,6 +84,14 @@ pub fn derive_active_model(input: TokenStream) -> TokenStream {
     }
 }
 
+#[proc_macro_derive(DeriveIntoActiveModel, attributes(sea_orm))]
+pub fn derive_into_active_model(input: TokenStream) -> TokenStream {
+    let input = parse_macro_input!(input as DeriveInput);
+    derives::expand_into_active_model(input)
+        .unwrap_or_else(Error::into_compile_error)
+        .into()
+}
+
 #[proc_macro_derive(DeriveActiveModelBehavior)]
 pub fn derive_active_model_behavior(input: TokenStream) -> TokenStream {
     let DeriveInput { ident, data, .. } = parse_macro_input!(input);

src/entity/prelude.rs

@@ -8,7 +8,7 @@ pub use crate::{
 #[cfg(feature = "macros")]
 pub use crate::{
     DeriveActiveModel, DeriveActiveModelBehavior, DeriveColumn, DeriveCustomColumn, DeriveEntity,
-    DeriveEntityModel, DeriveModel, DerivePrimaryKey, DeriveRelation,
+    DeriveEntityModel, DeriveModel, DerivePrimaryKey, DeriveRelation, DeriveIntoActiveModel
 };
 
 #[cfg(feature = "with-json")]

src/lib.rs

@@ -287,7 +287,7 @@ pub use schema::*;
 #[cfg(feature = "macros")]
 pub use sea_orm_macros::{
     DeriveActiveModel, DeriveActiveModelBehavior, DeriveColumn, DeriveCustomColumn, DeriveEntity,
-    DeriveEntityModel, DeriveModel, DerivePrimaryKey, DeriveRelation, FromQueryResult,
+    DeriveEntityModel, DeriveModel, DerivePrimaryKey, DeriveRelation, FromQueryResult, DeriveIntoActiveModel,
 };
 
 pub use sea_query;