I'd like to know weather is possible and how to configure a filter for the list view as the following with SonataAdminBundle in Symfony 2

Say I have entities Order, pointing to entities User, pointing to entities Company. I want to configure filters both for filtering by User and also for filtering by Company (User's Company) The first is straight forward. The second is what I try to clearify.

In the class OrderAdmin I would overwrite configureDatagridFilters as:

protected function configureDatagridFilters(DatagridMapper $datagridMapper)
{
     $datagridMapper
         ->add('created_at')
         //... some other filters on Order fields, as usual

         // the filter on User, provided 'user', no ploblem
         ->add('user')

         // and the filter by Company 
         ->add('user.company') // this doesn't work, of course
    ;
}

That syntax for the company filter is inpired by sonta docs: http://sonata-project.org/bundles/doctrine-orm-admin/2-0/doc/reference/filter_field_definition.html

Is not intended for what I try to acomplish, but cannot find where to look at.

Hope someone has a clue on this.

Thanks

symfony sonata-admin
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