refactor: repository get by id mixin

repositories/project.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.project import Project
 from repositories.base import BaseRepository
-from repositories.mixins import RepDeleteMixin, RepCreateMixin
+from repositories.mixins import RepDeleteMixin, RepCreateMixin, GetByIdMixin
 from schemas.project import CreateProjectSchema, UpdateProjectSchema
 
 
@@ -13,6 +11,7 @@ class ProjectRepository(
     BaseRepository,
     RepDeleteMixin[Project],
     RepCreateMixin[Project, CreateProjectSchema],
+    GetByIdMixin[Project],
 ):
     entity_class = Project
 
@@ -21,14 +20,8 @@ class ProjectRepository(
         result = await self.session.execute(stmt)
         return list(result.scalars().all())
 
-    async def get_by_id(self, project_id: int) -> Optional[Project]:
-        stmt = (
-            select(Project)
-            .where(Project.id == project_id, Project.is_deleted.is_(False))
-            .options(selectinload(Project.boards))
-        )
-        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(Project.boards))
 
     async def update(self, project: Project, data: UpdateProjectSchema) -> Project:
         project.name = data.name if data.name else project.name