refactor: repository get by id mixin

repositories/deal.py

@@ -1,18 +1,21 @@
 from typing import Optional
 
-from sqlalchemy import select
+from sqlalchemy import select, Select
 from sqlalchemy.orm import joinedload
 
 from models import Deal, CardStatusHistory, Board
 from repositories.base import BaseRepository
-from repositories.mixins import RepDeleteMixin, RepCreateMixin
+from repositories.mixins import RepDeleteMixin, RepCreateMixin, GetByIdMixin
 from schemas.base import SortDir
 from schemas.deal import UpdateDealSchema, CreateDealSchema
 from utils.sorting import apply_sorting
 
 
 class DealRepository(
-    BaseRepository, RepDeleteMixin[Deal], RepCreateMixin[Deal, CreateDealSchema]
+    BaseRepository,
+    RepDeleteMixin[Deal],
+    RepCreateMixin[Deal, CreateDealSchema],
+    GetByIdMixin[Deal],
 ):
     entity_class = Deal
 
@@ -58,14 +61,8 @@ class DealRepository(
         result = await self.session.execute(stmt)
         return list(result.scalars().all()), total_items
 
-    async def get_by_id(self, deal_id: int) -> Optional[Deal]:
-        stmt = (
-            select(Deal)
-            .options(joinedload(Deal.status), joinedload(Deal.board))
-            .where(Deal.id == deal_id, Deal.is_deleted.is_(False))
-        )
-        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(joinedload(Deal.status), joinedload(Deal.board))
 
     async def update(self, deal: Deal, data: UpdateDealSchema) -> Deal:
         deal.lexorank = data.lexorank if data.lexorank else deal.lexorank