refactor: repository get by id mixin

repositories/board.py

@@ -1,11 +1,9 @@
-from typing import Optional
-
-from sqlalchemy import select
+from sqlalchemy import select, Select
 from sqlalchemy.orm import selectinload
 
 from models import Board
 from repositories.base import BaseRepository
-from repositories.mixins import RepDeleteMixin, RepCreateMixin
+from repositories.mixins import RepDeleteMixin, RepCreateMixin, GetByIdMixin
 from schemas.board import UpdateBoardSchema, CreateBoardSchema
 
 
@@ -13,6 +11,7 @@ class BoardRepository(
     BaseRepository,
     RepDeleteMixin[Board],
     RepCreateMixin[Board, CreateBoardSchema],
+    GetByIdMixin[Board],
 ):
     entity_class = Board
 
@@ -25,14 +24,8 @@ class BoardRepository(
         result = await self.session.execute(stmt)
         return list(result.scalars().all())
 
-    async def get_by_id(self, board_id: int) -> Optional[Board]:
-        stmt = (
-            select(Board)
-            .where(Board.id == board_id, Board.is_deleted.is_(False))
-            .options(selectinload(Board.deals))
-        )
-        result = await self.session.execute(stmt)
-        return result.scalar_one_or_none()
+    def _process_get_by_id_stmt(self, stmt: Select) -> Select:
+        return stmt.options(selectinload(Board.deals))
 
     async def update(self, board: Board, data: UpdateBoardSchema) -> Board:
         board.lexorank = data.lexorank if data.lexorank else board.lexorank