How to submit multiple NEW items via Rails 3.2 mass-assignment

Question

I have a pretty standard use-case. I have a parent object and a list of child objects. I want to have a tabular form where I can edit all the children at once, as rows in th

Answer 1

Maybe you should just cheat. Put the new records in a different faux attribute that is a decorator for the actual one.

parent[children_attributes][0][fieldname]
parent[new_children_attributes][][fieldname]

It's not pretty, but it should work. It might take some extra effort to support round-trips to the form for validation errors.

Answer 2

long post deleted

Ryan has an episode on this: http://railscasts.com/episodes/196-nested-model-form-revised

It looks like you need to generate the unique index manually. Ryan uses the object_id for this.