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apps/shop/services/order_item.py

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+import json
+from decimal import Decimal
+from apps.shop.models import OrderItem as OrderItemModel
+
+
+def create_order_items(items: str, order_id: int):
+
+    json_items = json.loads(items)
+
+    for item in json_items:
+        order_item_obj = OrderItemModel()
+        order_item_obj.order_id = order_id
+        order_item_obj.price = Decimal(item.price)
+        order_item_obj.amount = int(item.amount)
+        order_item_obj.product_id = int(item.product)
+
+        order_item_obj.full_clean()
+        order_item_obj.save()