php - Symfony2 create new entity element in the form itself -

i using sonataadminbundle , in form want display mapped information. main object skin mapped cmselemnt, in witch content saved. need acces in form able update it.

i have mapped information:

skin.php

/**  * @orm\onetomany(targetentity="cmselement", mappedby="content")  */ private $navbar; 

cmselement.php

/**  * @orm\manytoone(targetentity="skin", inversedby="navbar")  * @orm\joincolumn(name="page_id", referencedcolumnname="id")  */ private $content; 

i tried using symfony dcumentation here:

http://symfony.com/doc/current/book/forms.html#embedding-a-single-object

so created service load cmselement information:

class skinelementtype extends abstracttype {     public function buildform(formbuilderinterface $builder, array $options) {          $builder             ->add('content', 'textarea');      }      public function setdefaultoptions(optionsresolverinterface $resolver)     {         $resolver->setdefaults(array(             'data_class' => 'mp\shopbundle\entity\cmselement',         ));     }      public function getname()     {         return 'skin_element_type_cms';     } } 

registered it:

skin_element_type_cms:     class: mp\shopbundle\form\type\skinelementtype     tags:         -  { name: form.type } 

now in skin admin this:

    /**      * @param formmapper $formmapper      */     protected function configureformfields(formmapper $formmapper)     {         $formmapper //            ->add('id', 'hidden')               ->add('name')             ->add('status', null, array('required' => false))         ->add('skin_element_type_cms', new cmselement(), array(             'required' => false,             'attr' => array('cols' => '8', 'rows' => '8'))) } 

i error:

please define type field `skin_element_type_cms` in `mp\shopbundle\admin\skinadmin` 

you don't have create custom form manage relations. can use sonata_type_collection manage onetomany relations.

skinadmin.php

protected function configureformfields(formmapper $formmapper) {     $formmapper         ->add('name')         ->add('status', null, array('required' => false))         ->add('navbar', 'sonata_type_collection', array(), array(             'edit' => 'inline',             'inline' => 'table'         ))    ; } 

check official documentation more details : https://sonata-project.org/bundles/doctrine-orm-admin/master/doc/reference/form_field_definition.html#advanced-usage-one-to-many