Fixed type hints, added cart item counter on main

repositories/order_items.py

@@ -2,7 +2,7 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select, update
 from typing import Optional
 
-from db.models.orders import OrderItem
+from db.models.orders import Order, OrderItem
 
 
 class OrderItemRepository:
@@ -12,6 +12,14 @@ class OrderItemRepository:
         stmt = select(OrderItem).where(OrderItem.id == item_id)
         return await session.scalar(stmt)
 
+    async def get_items_by_order(
+        self, session: AsyncSession, order_id: int
+    ) -> list[OrderItem]:
+        stmt = select(OrderItem).where(OrderItem.order_id == order_id)
+        result = await session.scalars(stmt)
+
+        return list(result)
+
     async def get_item_by_order_and_product(
         self, session: AsyncSession, *, order_id: int, product_id: int
     ) -> Optional[OrderItem]: