Work on swag documentation

app/services/cart_service.py

@@ -23,17 +23,18 @@ class CartService:
 				cursor.execute("select count from cart_item where cart_id = %s and product_id = %s", (user_id, product_id))
 				result = cursor.fetchone()
 
-				if cursor.rowcount != 0:
+				if cursor.rowcount == 1:
 					cursor.execute("update cart_item set count = count + %s where cart_id = %s and product_id = %s", (count, user_id, product_id))
 				else:
 					cursor.execute("insert into cart_item(cart_id, product_id, count) values (%s, %s, %s)", (user_id, product_id, count))
 
 				db_connection.commit()
 
-				return {"Success": "Successfully added to cart"}, 200
 
 		except Error as e:
-			return {"Failed": f"Failed to add item to cart. Reason: {e}"}, 400
+			return {"Failed": f"Failed to add item to cart. Reason: {e}"}, 500
+
+		return {"Success": "Successfully added to cart"}, 200
 
 	@staticmethod
 	def update_count(user_id: str, product_id: int, count: int) -> Tuple[Union[dict, str], int]: