Saving HABTM with extra fields?

Question

I am trying to save an order, and the products in the order.

The order is being saved, but the products are not.

I have an orders table and a

Answer 1

It could be that your orders_products table does not have it's own primary key. You will get this error unless your table looks something like this

CREATE TABLE orders_products (
  id integer,
  order_id integer,
  product_id integer,
  ...

I only just now had this same problem. Sorry such a simple answer did not get to you sooner.