refactor: entity not found exceptions handler

modules/fulfillment_base/repositories/deal_service.py

@@ -10,6 +10,7 @@ from modules.fulfillment_base.schemas.deal_service import (
 )
 from repositories.base import BaseRepository
 from repositories.mixins import RepGetAllMixin, RepUpdateMixin
+from utils.exceptions import ObjectNotFoundException
 
 
 class DealServiceRepository(
@@ -29,14 +30,18 @@ class DealServiceRepository(
             .order_by(DealService.service_id)
         )
 
-    async def get_by_id(self, deal_id: int, service_id: int) -> Optional[DealService]:
+    async def get_by_id(
+        self, deal_id: int, service_id: int, raise_if_not_found: Optional[bool] = True
+    ) -> Optional[DealService]:
         stmt = (
             select(DealService)
             .options(joinedload(DealService.service))
             .where(DealService.deal_id == deal_id, DealService.service_id == service_id)
         )
-        result = await self.session.execute(stmt)
-        return result.scalar_one_or_none()
+        result = (await self.session.execute(stmt)).scalar_one_or_none()
+        if result is None and raise_if_not_found:
+            raise ObjectNotFoundException("Связь сделки с услугой не найдена")
+        return result
 
     async def create(self, data: CreateDealServiceSchema):
         deal_service = DealService(**data.model_dump())