Fix the query for the sub department (#557)

Author: PoetryL

backend/app/admin/crud/crud_dept.py

@@ -100,18 +100,17 @@ async def get_with_relation(self, db: AsyncSession, dept_id: int) -> list[User]:
         user_relation = result.scalars().first()
         return user_relation.users
 
-    async def get_children(self, db: AsyncSession, dept_id: int) -> list[Dept]:
+    async def get_children(self, db: AsyncSession, dept_id: int) -> Sequence[Dept]:
         """
         获取子部门
 
         :param db:
         :param dept_id:
         :return:
         """
-        stmt = select(self.model).options(selectinload(self.model.children)).where(self.model.id == dept_id)
+        stmt = select(self.model).where(self.model.parent_id == dept_id, self.model.del_flag == 0)
         result = await db.execute(stmt)
-        dept = result.scalars().first()
-        return dept.children
+        return result.scalars().all()
 
 
 dept_dao: CRUDDept = CRUDDept(Dept)