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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

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