formualrio.php

<?php
    public function newAction($id)
    {


        $entity = new Entrada();
       $material = new Material($id);
      $entity->setMaterial($material);

        $form   = $this->createCreateForm($entity);
        $form->

        return $this->render('CooperativaRedeBundle:Entrada:new.html.twig', array(
            'entity' => $entity,
            'form'   => $form->createView(),

        ));
    }