Merge pull request #81 from tarunbhardwaj/develop

Added add_to method to copy sale_line to new sale #6889

cart.py

@@ -439,9 +439,7 @@ def _login_event_handler(cls, user=None):
             to_cart = cls.open_cart(True)
             # Transfer lines from one cart to another
             for from_line in guest_cart.sale.lines:
-                sale_line = to_cart.sale._add_or_update(
-                    from_line.product.id, from_line.quantity
-                )
+                sale_line = from_line.add_to(to_cart.sale)
                 sale_line.save()
 
         # Clear and delete the old cart

sale.py

@@ -172,3 +172,16 @@ def serialize(self, purpose=None):
                 ),
             })
         return res
+
+    def add_to(self, sale):
+        """
+        Copy sale_line to new sale.
+
+        Downstream modules can override this method to add change this behaviour
+        of copying.
+
+        :param sale: Sale active record.
+
+        :return: Newly created sale_line
+        """
+        return sale._add_or_update(self.product.id, self.quantity)