title: embedForm saving problem - Symfony
body: <p>I have schema like:</p>
  
  <p>Schema:</p>
  
  <pre><code> article:
     id:                                      ~
     title:                                   { type: VARCHAR, size: '255', required: true }
     created_at:                              { type: TIMESTAMP, required: true }
     updated_at:                              { type: TIMESTAMP, required: true }
  
   article_data:
     id:                                      ~
     article_data:                            { type: BLOB, required: true } 
     article_filename:                        { type: VARCHAR, size: '255'}
     article_id:                              { type: INTEGER, required: true, foreignTable: article, foreignReference: id, onDelete: cascade }
  </code></pre>
  
  <p>So, in my article admin module, I'd like to display the article_data widget, which is a file upload.</p>
  
  <p>Everything is fine. But when saving the uploaded file to the server, the article_id field is null.</p>
  
  <p>Is there a way i could get the id of the article and save it as the article_id of the article_data table?</p>
  
  <p>Thanks</p>
  
  <p>EDIT:</p>
  
  <p>I think I need to override the saveEmbeddedForm() method, but I am not sure what I'd need to do.</p>
  
  <p>Could someone help with some code for a saveEmbeddedForm()?</p>
  
  <p>Thanks</p>