Join with table alias (SeaQL/sea-orm#852)

SeaQL · Jul 13, 2022 · fc7b230 · fc7b230
1 parent d9b1b8f
commit fc7b230
Showing 1 changed file with 19 additions and 2 deletions.
diff --git a/SeaORM/docs/09-advanced-query/04-custom-joins.md b/SeaORM/docs/09-advanced-query/04-custom-joins.md
@@ -9,8 +9,12 @@ use sea_query::Expr;
 assert_eq!(
     cake::Entity::find()
         .column_as(filling::Column::Id.count(), "count")
+        .column_as(
+            Expr::tbl(Alias::new("fruit_alias"), fruit::Column::Name).into_simple_expr(),
+            "fruit_name"
+        )
+        // construct `RelationDef` on the fly
         .join_rev(
-            // construct `RelationDef` on the fly
             JoinType::InnerJoin,
             cake_filling::Entity::belongs_to(cake::Entity)
                 .from(cake_filling::Column::CakeId)
@@ -19,14 +23,27 @@ assert_eq!(
         )
         // reuse a `Relation` from existing Entity
         .join(JoinType::InnerJoin, cake_filling::Relation::Filling.def())
+        // join with table alias and custom on condition
+        .join_as(
+            JoinType::LeftJoin,
+            cake::Relation::Fruit
+                .def()
+                .on_condition(|_left, right| {
+                    Expr::tbl(right, fruit::Column::Name)
+                        .like("%tropical%")
+                        .into_condition()
+                }),
+            Alias::new("fruit_alias")
+        )
         .group_by(cake::Column::Id)
         .having(filling::Column::Id.count().equals(Expr::value(2)))
         .build(DbBackend::MySql)
         .to_string(),
     [
-        "SELECT `cake`.`id`, `cake`.`name`, COUNT(`filling`.`id`) AS `count` FROM `cake`",
+        "SELECT `cake`.`id`, `cake`.`name`, COUNT(`filling`.`id`) AS `count`, `fruit_alias`.`name` AS `fruit_name` FROM `cake`",
         "INNER JOIN `cake_filling` ON `cake_filling`.`cake_id` = `cake`.`id`",
         "INNER JOIN `filling` ON `cake_filling`.`filling_id` = `filling`.`id`",
+        "LEFT JOIN `fruit` AS `fruit_alias` ON `cake`.`id` = `fruit_alias`.`cake_id` AND `fruit_alias`.`name` LIKE '%tropical%'",
         "GROUP BY `cake`.`id`",
         "HAVING COUNT(`filling`.`id`) = 2",
     ]