catalogue operations, db migr and so on.

pre release version.

repositories/categories.py

@@ -1,6 +1,7 @@
+from typing import Optional
 from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select
-from typing import Optional
+from sqlalchemy.orm import aliased
 
 from db.models import Category
 
@@ -19,3 +20,36 @@ class CategoriesRepository:
         result = await session.scalars(stmt)
 
         return list(result)
+
+    async def get_category_path(self, session: AsyncSession, category_id: int):
+        base = select(Category.id, Category.parent_id, Category.name).where(
+            Category.id == category_id
+        )
+
+        cte = base.cte(name="path", recursive=True)
+
+        parent = aliased(Category)
+
+        cte = cte.union_all(
+            select(parent.id, parent.parent_id, parent.name).join(
+                cte, cte.c.parent_id == parent.id
+            )
+        )
+
+        stmt = select(cte)
+
+        result = await session.execute(stmt)
+
+        rows = result.all()
+
+        return list(reversed(rows))
+
+    async def add_category(
+        self, session: AsyncSession, *, name: str, parent_id: Optional[int]
+    ) -> Category:
+        category = Category(name=name, parent_id=parent_id)
+
+        session.add(category)
+        await session.commit()
+
+        return category