product management, unification of kb and so on.

services/orders.py

@@ -52,7 +52,7 @@ class OrderService:
                 session, order_item.id, quantity=order_item.quantity + quantity
             )
 
-        return order_item.quantity + quantity
+        return order_item.quantity
 
     async def remove_from_cart(
         self,
@@ -162,7 +162,9 @@ class OrderService:
 
         return CartDTO(items=cart_items, total=total, order_id=order.id)
 
-    async def build_full_cart_dto(self, session: AsyncSession, customer: int):
+    async def build_full_cart_dto(
+        self, session: AsyncSession, customer: int
+    ) -> CartDTO:
         order = await self.order_repo.get_draft_order_by_user(session, customer)
 
         cart_items = []