Symfony2 form queryBuilder find distinct object - symfony

Question

I have an Organization entity.
Acme\BaseBundle\Entity\Organization:
type: entity
...
oneToMany:
childOrganizations:
targetEntity: Organization
mappedBy: parentOrganization
manyToOne:
parentOrganization:
targetEntity: Organization
inversedBy: childOrganizations
nullable: true
I have this form:
->add('parentOrganization', 'entity', array(
'class' => "AcmeBaseBundle:Organization",
'property' => 'name',
'required' => false,
'query_builder' => function(EntityRepository $er)
{
return $er
->createQueryBuilder('o')
->select('o')
->add('groupBy', 'o.name');
},
))
Then I would like to show only different organizations. I mean if I have first, second and third organization. Then I have a form for the first organization and I would like to have just two choices in parentOrganization entity field (second and third), but in this case I have three choices (first can be parent of first).
Is there some way to leave out possibility to connect with own org?
EDIT: The problem is that I am working in form class and I don't know how to handle Organization object here. This is my code:
class OrganizationType extends AbstractType
{
/**
* #param FormBuilderInterface $builder
* #param array $options
*/
public function buildForm(FormBuilderInterface $builder, array $options)
{
$builder
->add('name', null, array('max_length' => 100))
->add('type')
->add('parentOrganization', 'entity', array(
'class' => "AcmeBaseBundle:Organization",
'property' => 'name',
'required' => false,
'query_builder' => function(EntityRepository $er)
{
return $er->createQueryBuilder('o')
->select('o')
->add('groupBy', 'o.name');
}
))
->add('addresses', 'bootstrap_collection', array(
'type' => new AddressType(),
'allow_add' => true,
'allow_delete' => true,
'add_button_text' => '+',
'delete_button_text' => '-',
'by_reference' => false,
'sub_widget_col' => 9,
'button_col' => 3
))
}
/**
* #param OptionsResolverInterface $resolver
*/
public function setDefaultOptions(OptionsResolverInterface $resolver)
{
$resolver->setDefaults(array(
'data_class' => 'Acme\BaseBundle\Entity\Organization'
));
}
public function getName()
{
return 'acme_basebundle_organization';
}
}

Answer 1

If you create form as written in doc (through method createForm of controller), then your current entity available in $options['data']. And your code will look like:
$entity = $options['data'];
...
'query_builder' => function(EntityRepository $er) use ($entity)
{
return $er->createQueryBuilder('o')
->select('o')
->add('groupBy', 'o.name')
->add('where', 'o.id != ?1')
->setParameter(1, $entity->getId());
}