Mixing forms in Rails

Question

In my app users can register information about a tournament. If the user is a paying customer, she can fill in additional info, otherwise the fields for the additional info are unavailable (visible but disabled).

I laid this out as two objects: Tournament and TournamentExtras where the former has_one :tournament_extras and the latter belongs_to :tournament. Tournament also accepts_nested_attributes_for :tournament_extras.

I would like this to show up as a single form. The fields in the two objects are related, meaning you can add a start date (to Tournament) but only paying customers can add an end date (to TournamentExtras) but since the two fields are logically realted, they should show up after eachother in the form.

How do I do this?

I tried opening the form_for and fields_for loops withing eachother (before adding any fields) hoping that I could add any field whereever I like. That didn't work; apparently you can't reference the form object within the fields loop(?).

Answer 1

form_form and fields_for should work with each other.

Somewhat of a skeleton for this is:

form_for(@tournament) do |f|
  f.fields_for(@tournament.tournament_extra) do |g|
  end
end