I'm using fields_for in my form like so

<%= form_for @user %>
  ...
  <%= f.fields_for :photos do |f2| %>
    <%= f2.radio_button :public, 'true' %>
  <% end %>
  ...
<% end %>

Here are the radio buttons it generates:

<input id="user_photos_attributes_0_public_true" name="user[photos_attributes][0][public]" type="radio" value="true" /> 
<input id="user_photos_attributes_0_id" name="user[photos_attributes][0][id]" type="hidden" value="1" /> 

<input id="user_photos_attributes_1_public_true" name="user[photos_attributes][1][public]" type="radio" value="true" /> 
<input id="user_photos_attributes_1_id" name="user[photos_attributes][1][id]" type="hidden" value="4" /> 

<input id="user_photos_attributes_2_public_true" name="user[photos_attributes][2][public]" type="radio" value="true" /> 
<input id="user_photos_attributes_2_id" name="user[photos_attributes][2][id]" type="hidden" value="5" />
...

I have this in user.rb

  has_many :photos
  accepts_nested_attributes_for :photos

When form is submitted I get this error:

Error during failsafe response: ActionView::Template::Error
TypeError (expected Hash (got Array) for param `photos_attributes'):

Does anyone know why this is happening?

Btw, I'm using Rails 3.0.0.rc2

ruby-on-rails ruby-on-rails-3
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