Select to many

src/executor/select.rs

@@ -1,6 +1,6 @@
 use crate::{
-    query::combine, DatabaseConnection, EntityTrait, FromQueryResult, JsonValue, Paginator,
-    QueryErr, QueryResult, Select, SelectTwo, TypeErr,
+    query::combine, DatabaseConnection, EntityTrait, FromQueryResult, Iterable, JsonValue,
+    ModelTrait, Paginator, PrimaryKeyToColumn, QueryErr, QueryResult, Select, SelectTwo, TypeErr,
 };
 use sea_query::SelectStatement;
 use std::marker::PhantomData;
@@ -125,6 +125,33 @@ where
         }
     }
 
+    fn parse_query_result(rows: Vec<(E::Model, F::Model)>) -> Vec<(E::Model, Vec<F::Model>)> {
+        let mut acc = Vec::new();
+        for (l_model, r_model) in rows {
+            if acc.is_empty() {
+                acc.push((l_model, vec![r_model]));
+                continue;
+            }
+            let (last_l, last_r) = acc.last_mut().unwrap();
+            let mut l_equal = true;
+            for pk_col in <E::PrimaryKey as Iterable>::iter() {
+                let col = pk_col.into_column();
+                let curr_val = l_model.get(col);
+                let last_val = last_l.get(col);
+                if !curr_val.eq(&last_val) {
+                    l_equal = false;
+                    break;
+                }
+            }
+            if l_equal {
+                last_r.push(r_model);
+            } else {
+                acc.push((l_model, vec![r_model]));
+            }
+        }
+        acc
+    }
+
     pub async fn one(
         self,
         db: &DatabaseConnection,
@@ -132,8 +159,12 @@ where
         self.into_model::<E::Model, F::Model>().one(db).await
     }
 
-    pub async fn all(self, db: &DatabaseConnection) -> Result<Vec<(E::Model, F::Model)>, QueryErr> {
-        self.into_model::<E::Model, F::Model>().all(db).await
+    pub async fn all(
+        self,
+        db: &DatabaseConnection,
+    ) -> Result<Vec<(E::Model, Vec<F::Model>)>, QueryErr> {
+        let rows = self.into_model::<E::Model, F::Model>().all(db).await?;
+        Ok(Self::parse_query_result(rows))
     }
 }
 

src/query/combine.rs

@@ -1,7 +1,7 @@
 use crate::{EntityTrait, IntoSimpleExpr, Iterable, QueryTrait, Select, SelectTwo};
 use core::marker::PhantomData;
 pub use sea_query::JoinType;
-use sea_query::{Alias, ColumnRef, Iden, SeaRc, SelectExpr, SelectStatement, SimpleExpr};
+use sea_query::{Alias, ColumnRef, Iden, Order, SeaRc, SelectExpr, SelectStatement, SimpleExpr};
 
 pub const SELECT_A: &str = "A_";
 pub const SELECT_B: &str = "B_";
@@ -48,11 +48,12 @@ where
     F: EntityTrait,
 {
     pub(crate) fn new(query: SelectStatement) -> Self {
-        let myself = Self {
+        Self {
             query,
             entity: PhantomData,
-        };
-        myself.prepare_select()
+        }
+        .prepare_select()
+        .prepare_order_by()
     }
 
     fn prepare_select(mut self) -> Self {
@@ -65,6 +66,13 @@ where
         }
         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
+    }
 }
 
 #[cfg(test)]
@@ -97,6 +105,7 @@ mod tests {
                 "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(" ")
         );
     }
@@ -116,6 +125,7 @@ mod tests {
                 "`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(" ")
         );
     }