title: Sonata Admin configureListFields show through query
body: <p>I am using sonata admin bundle for admin panel. I want to show data in configureListFields through query. I have table userChoiceProduct and fields :-</p>
  
  <pre><code>User_Id
  Product_Id
  </code></pre>
  
  <p>These fields automatically fill when user select any product and submit form. But these fields no relationship to other table.and I want to show User Email and Product Name in configureListFields
  bases on User_Id and Product_Id.</p>
  
  <p>Thanks!</p>