sea-orm/src/entity/model.rs
2021-10-04 13:13:36 +08:00

93 lines
2.8 KiB
Rust

use crate::{
DbErr, EntityTrait, Linked, QueryFilter, QueryResult, Related, Select, SelectModel,
SelectorRaw, Statement,
};
pub use sea_query::Value;
use std::fmt::Debug;
pub trait ModelTrait: Clone + Send + Debug {
type Entity: EntityTrait;
fn get(&self, c: <Self::Entity as EntityTrait>::Column) -> Value;
fn set(&mut self, c: <Self::Entity as EntityTrait>::Column, v: Value);
fn find_related<R>(&self, _: R) -> Select<R>
where
R: EntityTrait,
Self::Entity: Related<R>,
{
<Self::Entity as Related<R>>::find_related().belongs_to(self)
}
fn find_linked<L>(&self, l: L) -> Select<L::ToEntity>
where
L: Linked<FromEntity = Self::Entity>,
{
let tbl_alias = &format!("r{}", l.link().len() - 1);
l.find_linked().belongs_to_tbl_alias(self, tbl_alias)
}
}
pub trait FromQueryResult: Sized {
fn from_query_result(res: &QueryResult, pre: &str) -> Result<Self, DbErr>;
fn from_query_result_optional(res: &QueryResult, pre: &str) -> Result<Option<Self>, DbErr> {
Ok(Self::from_query_result(res, pre).ok())
}
/// ```
/// # #[cfg(feature = "mock")]
/// # use sea_orm::{error::*, tests_cfg::*, MockDatabase, Transaction, DbBackend};
/// #
/// # let db = MockDatabase::new(DbBackend::Postgres)
/// # .append_query_results(vec![vec![
/// # maplit::btreemap! {
/// # "name" => Into::<Value>::into("Chocolate Forest"),
/// # "num_of_cakes" => Into::<Value>::into(2),
/// # },
/// # ]])
/// # .into_connection();
/// #
/// use sea_orm::{query::*, FromQueryResult};
///
/// #[derive(Debug, PartialEq, FromQueryResult)]
/// struct SelectResult {
/// name: String,
/// num_of_cakes: i32,
/// }
///
/// # let _: Result<(), DbErr> = smol::block_on(async {
/// #
/// let res: Vec<SelectResult> = SelectResult::find_by_statement(Statement::from_sql_and_values(
/// DbBackend::Postgres,
/// r#"SELECT "name", COUNT(*) AS "num_of_cakes" FROM "cake" GROUP BY("name")"#,
/// vec![],
/// ))
/// .all(&db)
/// .await?;
///
/// assert_eq!(
/// res,
/// vec![SelectResult {
/// name: "Chocolate Forest".to_owned(),
/// num_of_cakes: 2,
/// },]
/// );
/// #
/// # Ok(())
/// # });
/// # assert_eq!(
/// # db.into_transaction_log(),
/// # vec![Transaction::from_sql_and_values(
/// # DbBackend::Postgres,
/// # r#"SELECT "name", COUNT(*) AS "num_of_cakes" FROM "cake" GROUP BY("name")"#,
/// # vec![]
/// # ),]
/// # );
/// ```
fn find_by_statement(stmt: Statement) -> SelectorRaw<SelectModel<Self>> {
SelectorRaw::<SelectModel<Self>>::from_statement(stmt)
}
}