I am trying to create a pane on the drupal commerce checkout page which will will give the user some options to change which product is in the cart. I want this done with ajax, without leaving the checkout page.

This is the code I have written so far:

  global $user;
  $product_id = 3;
  $order_id = commerce_cart_order_id($user->uid);
  commerce_order_delete($order_id); //delete the present order
  $newOrder = commerce_order_new($user->uid); //and create a new one
  commerce_order_save($newOrder);   //NEED?
  $product = commerce_product_load($product_id);  
  $lineItem = commerce_product_line_item_new($product, 1, $newOrder->order_id);
  commerce_line_item_save($lineItem); //NEED?

  // Add the line item to the order using fago's rockin' wrapper.
  $order_wrapper = entity_metadata_wrapper('commerce_order', $order);
  $order_wrapper->commerce_line_items[] = $line_item;

  // Save the order again to update its line item reference field.

  return $form;

However, this code gives me an ajax error

Failed to load resource: the server responded with a status of 500 (Internal Server Error) http://example.com/system/ajax

Am I making a code error? A Commerce error?

  • Check your server logs, they will contain a proper error message. – Clive Oct 30 '13 at 13:28

Going out on a limb a bit...

There's no function called commerce_new_order, you probably mean commerce_order_new()

Same thing with commerce_load_product() and commerce_product_load()

  • You're right. I changed that, an now I get a different error pop up: An AJAX HTTP error occured: Debugging information follows. Path /system/ajax StatusText: error ResponseText: EntityMetadataWrapperException: MIssing data values. in EntityMetadataWrapper->value() line 83 etc – user1015214 Oct 30 '13 at 13:45
  • It doesn't look like you've initialised the $order variable – Clive Oct 30 '13 at 13:46
  • your right, edited that above. But still have the same error. – user1015214 Oct 30 '13 at 13:51
  • You still haven't initialised an $order variable. The problems you're having are all to do with incorrectly named variables. Do yourself a favour - delete the code you have, and start again from fresh, paying close attention to the names of the variables you're creating, and how you're then using them – Clive Oct 30 '13 at 13:55
  • sorry, did a full edit now. I think it might work, just not sure yet because I think I have some rules set up which are messing with the order as well. – user1015214 Oct 30 '13 at 13:56

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