gistfile1.rb

class FoosController
  
  def new
    @foo = Foo.new
    @foo.attribute = "asdf"
    
    @foo.bars.build(:name => "blah")
    
    
    @default_questions = {}
    @default_questions[:multipe_choice] = Question.new(....)
  end
  
  
  
  
end




form_for @foo |f|
  ....
  f.fields_for questions, :index => "" do |ff|
    ....
    #name=foo[][bar]
    # name=foo[questions][]...
    
    ff.fields_for @default_qeustions[:multiple_choice]
    
    ....
  end
  ....

end






class Foo
  has_many :bars
end