php - How to render json into a twig in Symfony2 -

the question how pass json twig render template. i've tried pass json jsonresponse object did not find way render template.

tarifascontroller.php

<?php  /*  * file part of symfony package.  *  * (c) fabien potencier <fabien@symfony.com>  *  * full copyright , license information, please view license  * file distributed source code.  */  namespace appbundle\controller\admin;  use symfony\component\httpfoundation\request; use symfony\component\httpfoundation\response; use symfony\component\httpfoundation\jsonresponse; use symfony\bundle\frameworkbundle\controller\controller; use sensio\bundle\frameworkextrabundle\configuration\method; use sensio\bundle\frameworkextrabundle\configuration\route; use sensio\bundle\frameworkextrabundle\configuration\security; use appbundle\entity\tarifa;  /**  *  * @route("/tarifas")  */ class tarifascontroller extends controller {      /**      * @route("/", name="tarifa_index")      */     public function indexaction()     {         $entitymanager = $this->getdoctrine()->getmanager();         $tarifas = $entitymanager->getrepository('appbundle:tarifa')->findall();          return $this->render('admin/tarifas/index.html.twig', array('tarifas' => $tarifas));         //return new jsonresponse(array('json_tarifas' => json_encode($tarifas)));      } } 

index.html.twig

{% extends 'admin/layout.html.twig' %}  {% block body_id 'admin_post_show' %}  {% block main %}      <h1>{{ 'label.project_list'|trans }}</h1>      <table id="tarifas_index" class="table table-striped">         <thead>         <tr>             <th>{{ 'id' }}</th>             <th><i class="fa fa-user"></i> {{ 'label.title'|trans }}</th>             <th><i class="fa fa-calendar"></i> {{ 'label.summary'|trans }}</th>             <th><i class="fa fa-calendar"></i> {{ 'label.content'|trans }}</th>             <th><i class="fa fa-cogs"></i> {{ 'label.actions'|trans }}</th>         </tr>         </thead>         <tbody>         {% tarifa in tarifas %}             <tr>                 <td>{{ tarifa.id }}</td>                 <td>{{ tarifa.codigo }}</td>                 <td>{{ tarifa.nombre }}</td>                 <td>{{ tarifa.razon }}</td>                 <td>                     <div class="item-actions">                         <a href="{{ path('project_detail', { id: tarifa.id }) }}" class="btn btn-sm btn-default">                             {{ 'action.show'|trans }}                         </a>                     </div>                 </td>             </tr>         {% endfor %}         </tbody>     </table>      <script>         $(document).ready( function () {             $('#tarifas_index').datatable({                 data: tarifas             });         } );     </script>  {% endblock %} 

how can pass json controller use in datatable (in twig template) mantaining render in controller. please, can me?

i don't understand trying achieve can send json encoded , normal data twig, use how want

return $this->render('admin/tarifas/index.html.twig', array(     'tarifas' => $tarifas     'json_tarifas' => json_encode($tarifas) ));