OneToMany with subclass Inheritance

[Ivan Horomanski]

Hello ,

i would like to know if is possible to embed on the declaration of an Admin form a relationship one to many with a subclass entity. Im following the example of demo.sonata-project.org for car entity, and  this is my case:

Class Family

     /**
     * @ORM\OneToMany(targetEntity="FamilyChild", mappedBy="family")
     */
    private $childs;


**
 * @ORM\Entity
 * @ORM\InheritanceType("SINGLE_TABLE")
 * @ORM\DiscriminatorColumn(name="type", type="string")
 * @ORM\DiscriminatorMap({"ProspectChild"="ProspectChild","FamilyChild"="FamilyChild"})
 */
Class Child


...some fields



/**
 * @ORM\Entity
 */
class FamilyChild extends Child
{
... some fields


this is my admin service declaration:

 <service id="eenfants.family.admin.child" class="Eenfants\FamilyBundle\Admin\ChildAdmin">
            <tag name="sonata.admin" manager_type="orm" group="Demo" label="Car" />

            <argument />
            <argument>Eenfants\FamilyBundle\Entity\Child</argument>
            <argument />

            <call method="setSubClasses">
                <argument type="collection">
                    <argument key="FamilyChild">Eenfants\FamilyBundle\Entity\FamilyChild</argument>
                    <argument key="ProspectChild">Eenfants\FamilyBundle\Entity\ProspectChild</argument>
                </argument>
            </call>

        </service>

this is what im doing on my form declaration:

 /**
     * @param FormMapper $formMapper
     */
    protected function configureFormFields(FormMapper $formMapper)
    {
        $formMapper ->add('childs','sonata_type_collection', array('by_reference' => false), array(
                'edit' => 'inline',
                'inline' => 'table',
                'link_parameters'   => array('subclass' => 'FamilyChild'),
                'admin_code' => 'eenfants.family.admin.child')

but is not working , im getting this exception:

Feature not implemented: an embedded admin cannot have subclass

some help would be highly appreciated!

best