symfony - OneToMany relationship with checkboxes as choices in a form using custom FormType -

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i have model costtypeconnection has 1 many relation departmentconnection.

i want, departmentconnection displayed checkboxes.

my costtypeconnection class has variable $costtype, entity costtype, has $name varaible in it.

my departmentconnection class has variable $department, entity department, has $name variable.

my costtypeformtype: 

  ....         public function buildform(formbuilderinterface $builder, array $options)     {         $builder             ->add('costtype', 'text', array(                 'label' => 'costtype'             ))             ->add('departmentconnections', 'collection', array(                 'type' => new departmentconnectiontype(),                 'allow_add'    => false,                 'label' => false,                 'by_reference' => false,                 'options' => array('label' => false),              ))         ;     } ...

my departmentconnection:

... public function buildform(formbuilderinterface $builder, array $options)     {         $builder             ->add('department', 'text', array(                 'label' => false             ))         ;     }...

so not possible define checkbox-type in formbuilder department, because entity , not variable. has idea can do? doesnt work in departmentconnectiontype class:

public function buildform(formbuilderinterface $builder, array $options)     {         $builder             ->add('department', 'choice', array(                 'label' => false             ))         ;     }

it finishs error:

the value of type "object" cannot converted valid array key

thanks help!!!

note : recommended minimum version symfony 2.7

you should use \symfony\bridge\doctrine\form\type\entitytype in form.

see http://symfony.com/doc/2.7/reference/forms/types/choice.html , http://symfony.com/doc/2.7/reference/forms/types/entity.html

here's example :

public function buildform(formbuilderinterface $builder, array $options) {     $builder         ->add('costtype', 'text', array(             'label' => 'cost type :' // -> <label class="required">cost type :</label><input value="<?php echo $costtypeconnection->getcosttype(); ?> required>         ))         ->add('departmentconnections', 'entity', array(             'class' => 'acme\bundle\entity\departmentconnection',             // before 2.7 use 'property' instead of 'choice_label'             'choice_label' => 'type', // equals $costtypeconnections->getdepartmentconnexion()->gettype();             'label' => 'department connexion :',             'expanded' => true, // output set of inputs instead of select tag             'multiple' => true, // output checkboxes instead of radio buttons             'required' => true, // unused multiple true         ))     ; } ...

would output :

<div id="form_cost_type_connexion_department_connections">     department connexion :     <input type="checkbox" value="on" ... <label>$costtypeconnections->getdepartmentconnections()->gettype()     ...

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