Show on edit screens

By default, has_and_belongs_to_many is only visible on the Show page. If you want to enable it on the Edit page, too, you need to add the show_on: :edit option.

WARNING

Adding associations on the New screen is not currently supported. The association needs some information from the parent record that hasn't been created yet (because the user is on the New screen).

You may use the redirect helpers to have the following flow:

1. User is on the New view. They can't see the association panels yet.
2. User creates the record.
3. They get redirected to the Show/Edit view, where they can see the association panels.
4. User attaches associations.