title: update_attributes on nested forms does not work
body: <p>I have a nested form and trying to update it using update_attributes but it doesnt seem to work. I am using rails 2.3.8</p>
  
  <p>Can you please help?</p>
  
  <p>Aanu</p>
  
  <p>adding some code</p>
  
  <p>controller code:</p>
  
  <pre><code>update
  @app.update_attributes(params[:application])
  end 
  </code></pre>
  
  <p>@_params:</p>
  
  <pre><code>{"authenticity_token"=&gt;"AdSr8o51u7GfnOwLSpEOe5xAPINd7ImxDpuayPk12No=", "_method"=&gt;"put", "action"=&gt;"update", "id"=&gt;"10006", "stype"=&gt;"Save", 
  "application"=&gt;{
      "contact_attributes"=&gt;{"city"=&gt;"Denver", "address"=&gt;"7000 Drive", "zip"=&gt;"22222", "first_name"=&gt;"Randy"}, "details_attributes"=&gt;{
          "2"=&gt;{ "coverage"=&gt;"false", "same_fee"=&gt;"true", "fee_rate"=&gt;"2000", "id"=&gt;"10018", "year_estabilished"=&gt;"2005"}
      }}
  }
  </code></pre>