Sonata Admin custom query in configureListFields
You can change the type of your field to null or entity and add a query_builder option to adapt the query used :
protected function configureListFields(ListMapper $listMapper){ $listMapper ->addIdentifier('name') ->add('products', null, array( 'query_builder' => function(EntityRepository $er) { return $er->createQueryBuilder('qb') ->leftjoin('qb.products', 'p') ->where('p.active = :act') ->setParameter('act', true) } ));}I didn't test it with a oneToMany relation.
There are some information in this topic