隐藏字段:DataTransformer:GenemuFormBundle:Select2:Symfoy2中的深度收集表

数据结构：

我的''示例捆绑包''实体''父级：

oneToMany:
    children:
        targetEntity: Children
        mappedBy    : parent
        cascade     : ["persist", "remove"]
manyToMany:
    friends:
      targetEntity  : Friend
      inversedBy    : parents
      cascade       : ["persist"]
      joinTable     :
        name        : my_parents_and_friends
        joinColumns :
            joinColum:
                name                : parent_id
                referencedColumnName: id
                onDelete            : CASCADE
        inverseJoinColumns:
            joinColum:
                name                : friend_id
                referencedColumnName: id
                onDelete            : CASCADE

我的''ExampleBundle''Entity''Children:

manyToOne:
    parent:
        targetEntity: Parent
        inversedBy  : children
        joinColumn  :
            name                : parent_id
            referencedColumnName: id
manyToMany:
    friends:
      targetEntity  : Friend
      inversedBy    : children
      cascade       : ["persist"]
      joinTable     :
        name        : my_children_and_friends
        joinColumns :
            joinColum:
                name                : children_id
                referencedColumnName: id
                onDelete            : CASCADE
        inverseJoinColumns:
            joinColum:
                name                : friends_id
                referencedColumnName: id
                onDelete            : CASCADE

我的''示例捆绑包''实体''朋友：

manyToOne:
    school:
        targetEntity: My'SchoolBundle'Entity'School
        inversedBy  : friends
        joinColumn  :
            name                : school
            referencedColumnName: id
manyToMany:
    parents:
        targetEntity: Parent
        mappedBy    : friends
    children:
        targetEntity: Children
        mappedBy    : friends

我的''学校捆绑包''实体''学校：

oneToMany:
    friends:
        targetEntity: My'ExampleBundle'Entity'Friend
        mappedBy    : school
        cascade     : ["persist", "remove"]

我的''ExampleBundle''Controller''ParentController:

/**
 * Edit Action
 */
public function editAction(Request $request, $id)
{
    //...
    $form = $this->createForm(new ParentType($this->getUser()), $parent);

我的''ExampleBundle''Form''Type''ParentType:

public function buildForm(FormBuilderInterface $builder, array $options)
{
    //...
    $builder->add('children', 'collection', array(
        'type' => new ChildrenType($this->user),
        'options' => array(
            'required' => true,
        ),
        'allow_add'    => true,
        'by_reference' => false,
        'allow_delete' => true,
        'prototype'    => true
    ));
}

我的''示例捆绑包''窗体''类型''儿童类型：

public function buildForm(FormBuilderInterface $builder, array $options)
{
    //...
    $builder->add('friends', 'collection', array(
        'type'    => new FriendType($this->user),
        'options' => array(
            'required' => true,
        ),
        'allow_add'    => true,
        'by_reference' => false,
        'allow_delete' => true,
        'prototype'    => true
    ));

我的''ExampleBundle''Form''Type''FriendType:

public function buildForm(FormBuilderInterface $builder, array $options)
{
    //...
    $builder->add('school', 'genemu_jqueryselect2_hidden');
ERROR:
    The form's view data is expected to be of type scalar,
    array or an instance of 'ArrayAccess, but is an instance of class My'SchoolBundle'Entity'School.
    You can avoid this error by setting the "data_class" option to "My'SchoolBundle'Entity'School"
    or by adding a view transformer that transforms an instance of class My'SchoolBundle'Entity'School to scalar,
    array or an instance of 'ArrayAccess. 

然后：
我的''ExampleBundle''Form''Type''FriendType:

public function buildForm(FormBuilderInterface $builder, array $options)
{
    //...
    $builder->add('school', 'genemu_jqueryselect2_hidden', array(
        'data_class' => 'My'SchoolBundle'Entity'School',
    ));
ERROR:
    ContextErrorException: Catchable Fatal Error: Object of class My'SchoolBundle'Entity'School could not be converted to string
    in /path/to/symfony2/app/cache/dev/twig/b5/df/83d3ad1c70181782da8626f8237b177e7063eb64a745f97ba87b9b8b025d.php line 323
    // View of Twig is simple like this:
    {{ form_widget(friend.school) }}

然后：
我不使用GenemuFormBundle，我试图创建一个个人数据转换器。

$transformer = new SchoolTransformer($this->entityManager);
$builder->add(
    $builder->create('school',
        'hidden',
        array(
            'by_reference' => false,
            'required'     => false,
            'attr'         => array(
                'class' => 'select2'
            ),
        )
    )->addModelTransformer($transformer)
);
ERROR: This is same error above.

所以我认为通常的方法是实体字段，但我想对大量数据应用select2
然而，它未能生成一个隐藏的表单字段

如有任何帮助或想法，我们将不胜感激。