Nothing shows up under fields_for when referring to a valid association

Hi,

I have something like this:

    class Group < ActiveRecord::Base
      has_many :members
      accepts_nested_attributes_for :members
    end

    class Member < ActiveRecord::Base
      belongs_to :group
    end

    -form_for @group do |form|
      -form.fields_for :members do |member|
        =member.text_field :display_name

and nothing shows up under "form.fields_for :members do |member|". In
fact, if I put invalid code there, it's not even evaluated. However,
if I specify an invalid assocation like "form.fields_for :memberszzzz
do |member|", the text field for :display_name does show up.

Does anyone know what could be problem?

Thanks!

Bob

Ok, it turns out the problem was that I needed to specify
attr_accessible :members_attributes in the model, and
@group.members.build in the controller for it to work.

Found the solution here:
http://stream.btucker.org/post/93887650/accepts-nested-attributes-for-fields-for