php - form.post_bind is fired twice -

i added form event symfony form. problem event seems fired twice. when debugging, goes twice method , don't know why.

i have form type uses form type. have videofiletype form adding field of imagetype. both of these forms need process done once form submitted.

imagetype

<?php # src/acme/photobundle/form/type/thumbnailtype.php  namespace osc\mediabundle\form\type;  use osc\mediabundle\manager\imagemanager; use symfony\component\dependencyinjection\container; use symfony\component\form\abstracttype; use symfony\component\form\extension\core\choicelist\objectchoicelist; use symfony\component\form\formbuilderinterface; use symfony\component\form\formevent; use symfony\component\form\formevents; use symfony\component\httpkernel\exception\unsupportedmediatypehttpexception; use symfony\component\optionsresolver\optionsresolverinterface;  class imagetype extends abstracttype {     private $imagemanager;      public function __construct(imagemanager $imagemanager) {         $this->imagemanager = $imagemanager;     }       public function buildform(formbuilderinterface $builder, array $options)     {         $builder->add('file', 'file');          $builder->addeventlistener(             formevents::post_submit,             array($this, 'onpostsetdata')         );     }      public function getdefaultoptions(array $options) {         return array('data_class' => 'osc\mediabundle\entity\image');     }      public function setdefaultoptions(optionsresolverinterface $resolver)     {         $resolver->setdefaults(array(             'data_class' => 'osc\mediabundle\entity\image'         ));     }      public function onpostsetdata(formevent $event) {         $image = $event->getdata();         $form = $event->getform();          //we need here update image file new content         $image = $this->imagemanager->uploadimage($image);         $event->setdata($image);     }      public function getname()     {         return 'image';     } } 

videofiletype

<?php # src/acme/photobundle/form/type/thumbnailtype.php  namespace osc\mediabundle\form\type;  use osc\mediabundle\manager\videofilemanager; use symfony\component\dependencyinjection\container; use symfony\component\form\abstracttype; use symfony\component\form\extension\core\choicelist\objectchoicelist; use symfony\component\form\formbuilderinterface; use symfony\component\form\formevent; use symfony\component\form\formevents;  class videofiletype extends abstracttype {      public $container;      public $videopresets = [];      public $videofilemanager;      public function __construct(videofilemanager $videofilemanager, container $container) {         $this->container = $container;         $videopresets = $container->getparameter('osc_media.video.presets');         foreach ($videopresets $key => $videopreset) {             array_push($this->videopresets, $key);         }          $this->videofilemanager = $videofilemanager;      }      public function buildform(formbuilderinterface $builder, array $options)     {         $builder->add('thumbnail', 'image');         $builder->add('file', 'file');         $builder->add('videopreset', 'choice', array(             'choices' => $this->videopresets,             'multiple' => false,             'required' => true         ));         $builder->addeventlistener(             formevents::post_submit,             array($this, 'onpostsetdata')         );         $builder->add('save', 'submit');     }      public function onpostsetdata(formevent $event) {         $videofile = $event->getdata();         $form = $event->getform();          //we upload video file         $videofile = $this->videofilemanager->uploadvideofile($videofile);          $event->setdata($videofile);     }       public function getdefaultoptions(array $options) {         return array('data_class' => 'osc\mediabundle\entity\videofile');     }      public function getname()     {         return 'video_file';     } } 

i don't know why onpostsetdata method called twice...