title: Symfony2 - Give a default filter in a list of elements of Sonata Admin
body: <p>I have a list of elements of type Vehicle and I show these elements with Sonata Admin. I allow to filter these elements by the "status" field, but I want that, when the list is showed, only the active vehicles are showed, and if somebody wants to see the inactive vehicles, uses the filter and select the inactive status. I would like to know if somebody Knows the way to apply filters by default for a list of elements using Sonata Admin.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>public function configureListFields(ListMapper $listMapper)
  {
      $listMapper
          -&gt;addIdentifier('name')
          -&gt;add('status')
      ;
  }
  
  protected function configureDatagridFilters(DatagridMapper $mapper)
   {
       $mapper
           -&gt;add('name')
           -&gt;add('status')
       ;
   }
  </code></pre>
  
  <p>Is there any option that can be added to the status field in configureDatagridFilters() to achieve this goal? Other options?</p>
  
  <p>Thanks in advance.</p>