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use crate::{EntityTrait, IntoSimpleExpr, Iterable, QueryTrait, Select, SelectTwo, SelectTwoMany}; use core::marker::PhantomData; pub use sea_query::JoinType; use sea_query::{Alias, ColumnRef, Iden, Order, SeaRc, SelectExpr, SelectStatement, SimpleExpr}; pub const SELECT_A: &str = "A_"; pub const SELECT_B: &str = "B_"; impl<E> Select<E> where E: EntityTrait, { fn apply_alias(mut self, pre: &str) -> Self { self.query().exprs_mut_for_each(|sel| { match &sel.alias { Some(alias) => { let alias = format!("{}{}", pre, alias.to_string().as_str()); sel.alias = Some(SeaRc::new(Alias::new(&alias))); } None => { let col = match &sel.expr { SimpleExpr::Column(col_ref) => match &col_ref { ColumnRef::Column(col) => col, ColumnRef::TableColumn(_, col) => col, }, _ => panic!("cannot apply alias for expr other than Column"), }; let alias = format!("{}{}", pre, col.to_string().as_str()); sel.alias = Some(SeaRc::new(Alias::new(&alias))); } }; }); self } pub fn select_also<F>(mut self, _: F) -> SelectTwo<E, F> where F: EntityTrait, { self = self.apply_alias(SELECT_A); SelectTwo::new(self.into_query()) } pub fn select_with<F>(mut self, _: F) -> SelectTwoMany<E, F> where F: EntityTrait, { self = self.apply_alias(SELECT_A); SelectTwoMany::new(self.into_query()) } } impl<E, F> SelectTwo<E, F> where E: EntityTrait, F: EntityTrait, { pub(crate) fn new(query: SelectStatement) -> Self { Self { query, entity: PhantomData, } .prepare_select() } fn prepare_select(mut self) -> Self { prepare_select_two::<F, Self>(&mut self); self } } impl<E, F> SelectTwoMany<E, F> where E: EntityTrait, F: EntityTrait, { pub(crate) fn new(query: SelectStatement) -> Self { Self { query, entity: PhantomData, } .prepare_select() .prepare_order_by() } fn prepare_select(mut self) -> Self { prepare_select_two::<F, Self>(&mut self); self } fn prepare_order_by(mut self) -> Self { for col in <E::PrimaryKey as Iterable>::iter() { self.query.order_by((E::default(), col), Order::Asc); } self } } fn prepare_select_two<F, S>(selector: &mut S) where F: EntityTrait, S: QueryTrait<QueryStatement = SelectStatement>, { for col in <F::Column as Iterable>::iter() { let alias = format!("{}{}", SELECT_B, col.to_string().as_str()); selector.query().expr(SelectExpr { expr: col.into_simple_expr(), alias: Some(SeaRc::new(Alias::new(&alias))), }); } } #[cfg(test)] mod tests { use crate::tests_cfg::{cake, fruit}; use crate::{ColumnTrait, DbBackend, EntityTrait, QueryFilter, QuerySelect, QueryTrait}; #[test] fn alias_1() { assert_eq!( cake::Entity::find() .column_as(cake::Column::Id, "B") .apply_alias("A_") .build(DbBackend::MySql) .to_string(), "SELECT `cake`.`id` AS `A_id`, `cake`.`name` AS `A_name`, `cake`.`id` AS `A_B` FROM `cake`", ); } #[test] fn select_also_1() { assert_eq!( cake::Entity::find() .left_join(fruit::Entity) .select_also(fruit::Entity) .build(DbBackend::MySql) .to_string(), [ "SELECT `cake`.`id` AS `A_id`, `cake`.`name` AS `A_name`,", "`fruit`.`id` AS `B_id`, `fruit`.`name` AS `B_name`, `fruit`.`cake_id` AS `B_cake_id`", "FROM `cake` LEFT JOIN `fruit` ON `cake`.`id` = `fruit`.`cake_id`", ].join(" ") ); } #[test] fn select_with_1() { assert_eq!( cake::Entity::find() .left_join(fruit::Entity) .select_with(fruit::Entity) .build(DbBackend::MySql) .to_string(), [ "SELECT `cake`.`id` AS `A_id`, `cake`.`name` AS `A_name`,", "`fruit`.`id` AS `B_id`, `fruit`.`name` AS `B_name`, `fruit`.`cake_id` AS `B_cake_id`", "FROM `cake` LEFT JOIN `fruit` ON `cake`.`id` = `fruit`.`cake_id`", "ORDER BY `cake`.`id` ASC", ].join(" ") ); } #[test] fn select_also_2() { assert_eq!( cake::Entity::find() .left_join(fruit::Entity) .select_also(fruit::Entity) .filter(cake::Column::Id.eq(1)) .filter(fruit::Column::Id.eq(2)) .build(DbBackend::MySql) .to_string(), [ "SELECT `cake`.`id` AS `A_id`, `cake`.`name` AS `A_name`,", "`fruit`.`id` AS `B_id`, `fruit`.`name` AS `B_name`, `fruit`.`cake_id` AS `B_cake_id`", "FROM `cake` LEFT JOIN `fruit` ON `cake`.`id` = `fruit`.`cake_id`", "WHERE `cake`.`id` = 1 AND `fruit`.`id` = 2", ].join(" ") ); } #[test] fn select_with_2() { assert_eq!( cake::Entity::find() .left_join(fruit::Entity) .select_with(fruit::Entity) .filter(cake::Column::Id.eq(1)) .filter(fruit::Column::Id.eq(2)) .build(DbBackend::MySql) .to_string(), [ "SELECT `cake`.`id` AS `A_id`, `cake`.`name` AS `A_name`,", "`fruit`.`id` AS `B_id`, `fruit`.`name` AS `B_name`, `fruit`.`cake_id` AS `B_cake_id`", "FROM `cake` LEFT JOIN `fruit` ON `cake`.`id` = `fruit`.`cake_id`", "WHERE `cake`.`id` = 1 AND `fruit`.`id` = 2", "ORDER BY `cake`.`id` ASC", ].join(" ") ); } }