[Rails] Rails 3 - Nested Forms, using Builder -- Check_box issue

Hello, I have the following:

My Controller:

def new
.
.
@teammembers.each do |teammember|
request = @request_thread.requests.build(:recipient_id =>
teammember.user_id, :full_name => 'Billy Bob T')
end

My View:
.
.
<%= f.fields_for :requests do |builder| %>

<div class="field">
<%= builder.label :full_name %>
<%= builder.check_box :recipient_id, :checked => false %>
</div>
<% end %>
.
.
The nested form for requests only holds the user_id, not the
user.name... Problem is in the nested form, I need to show the
user.name next to the check_box. So I tried adding a virtual attribute
in the model (attr_accessor :full_name), so I could use full_name but
I can't see to access that in the nested form (inside builder).

Also, the checkbox doesn't have the recipient_id as the value being
set? I want to use the checkbox to tell Rails whether or not to create
the record or not on submit using something like this in the model
":reject_if => lambda { |a| a[:recipient_id].blank? }"

Anyone with fields_for experience?

Any tips or suggestions from the pros?

Thanks

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