php - Symfony form CollectionType Field -

hi i'm quite new in symfony 2. i'm dealing problem several hours now, i'm forced ask comunity.

i have 2 entities

user --> language (onetomany)

user entity

/**  *   * @orm\onetomany(targetentity="user_language", mappedby="user")  */ private $languages;  public function __construct() {     $this->languages = new arraycollection(); } 

user_language entity

/** @orm\column(type="string", length=50) */ private $language;  /**  * @orm\manytoone(targetentity="user", inversedby="languages")  */ private $user; 

user_languagetyp

public function buildform(formbuilderinterface $builder, array $options) {      $builder         ->add( 'language' ); } 

i'm trying build form user can add/edit/delete speaking languages

user_language in database

when getting data database (in controller) - $user->getlanguages() got persistantcollection, querybuilder() got array

is there way, how pass createform() function?

$form = $this->createform( user_languagetype::class, $user->getlanguages() ); 

i'm getting 2 erros:

the form's view data expected instance of class arpanetruzicja7estatesbundle\entity\user_language, instance of class doctrine\orm\persistentcollection. 

or

the form's view data expected instance of class arpanetruzicja7estatesbundle\entity\user_language, a(n) array. can avoid error setting "data_class" option null or adding view transformer transforms a(n) array instance of arpanetruzicja7estatesbundle\entity\user_language. 

setting 'data_class' => null, did not help.

thanks lot.

if want allow user add/delete number of languages, have use collection type field. http://symfony.com/doc/2.7/reference/forms/types/collection.html

here use it: http://symfony.com/doc/2.7/form/form_collections.html

you create form user entity, add collection field type on user_languagetype, , have add javascript manage adding , deleting language.

i don't write example, symfony doc perfect :)

but assume have form/usertype, can add collection field :

->add('tags', 'collection', [         'type'         => new user_languagetype(),         'allow_add'    => true,         'allow_delete' => true,     ]); 

(for symfony3)

->add('tags', 'collection', [         'type'         => user_languagetype::class,         'allow_add'    => true,         'allow_delete' => true,     ]); 

the array short syntaxe [] needs php5.4 min, if not use array()