php - Variable as name of row in TWIG : Symfony 2 -

i have problem in symfony2 application. in controller i'm getting array of facebook users , posting form class, create checkboxes. in template need print theese checkboxes pictures of these users. try print : {{form_row(form.{{girl.id}})}}, twig template doesn't allow use variable {{girl.id}} name of row , don't know how print theese checkboxes pictures. can me ?

this ma controller action

public function indexaction()     {          $facebook = $this->get('facebook');         $friends = $facebook->api('me/friends?fields=id,name,gender');          $friends = $friends['data'];         foreach($friends $friend){              if(array_key_exists('gender',$friend))             {             if($friend['gender'] =='female')                 $girls[]=$friend;             }             }             ($i=0; $i <5; $i++) {                  $default[]=$girls[$i];             }         $formular = new friendsform();         $formular->addfriend($default);          $form = $this->createform($formular);             return array('girls'=>$default,'form' => $form->createview());     } 

this form class

class friendsform extends abstracttype {     private $friends;      public function buildform(formbuilderinterface $builder, array $options)     {         $friends = $this->friends;          foreach($friends $friend)         {             $builder             ->add($friend['id'],'checkbox',array('label' => false,'required'=>false, 'value'=>$friend['']));         ;             }      }       public function getname()     {         return '';      }       public function addfriend($data)     {         $this->friends = $data;     }  } 

this template

<p> {%if girls defined%} {{form_start(form)}} {%for girl in girls%} {{form.row(form.{{girl.id}})}} {%endfor%} {{form_end(form)}} {%endif%} </p> 

you can use attribute built-in function (as of 1.2).

http://twig.sensiolabs.org/doc/functions/attribute.html says

attribute can used access "dynamic" attribute of variable

in such case can write below:

{{ form_row(attribute(form, girl.id)) }}