title: Nested Attributes not saving inside a form in Rails
body: <p>I have Tours, which has_many Photos... Photos belong_to Tours... This is all going okay, but when I try to edit the attributes of an uploaded photo, it will not save in the database... ( I have imported some data, and this saves fine, but it just won't save any changes)</p>
  
  <p>I have a form with nested_attributes</p>
  
  <pre><code>= semantic_form_for ([:admin, @tour]), :html =&gt; {:multipart =&gt; true} do |f|
  ... 
   - @tour.photos.each do |photo|
   ...
   = f.semantic_fields_for photo do |p|
      ...  
      = p.inputs :alt, :description, :temp_src, :remote_image_url
  </code></pre>
  
  <p>The fields populate correctly, but when I save the form.. they do not update...</p>
  
  <p>Any clues?</p>