form select parent hydration - php

Question

I have a zf2 application that works with doctrine.
I have the following entity:
class Role
{
/**
* #var int
* #ORM\Id
* #ORM\Column(type="integer")
* #ORM\GeneratedValue(strategy="AUTO")
*/
protected $id;
/**
* #var string
* #ORM\Column(type="string", length=255, unique=true, nullable=true)
*/
protected $name;
/**
* #var ArrayCollection
* #ORM\OneToMany(targetEntity="YrmUser\Entity\Role", mappedBy="parent")
*/
protected $children;
/**
* #var Role
* #ORM\ManyToOne(targetEntity="YrmUser\Entity\Role", inversedBy="children", cascade={"persist"})
* #ORM\JoinColumn(name="parent_id", referencedColumnName="id")
*/
protected $parent;
}
for this entity i have a form:
class RoleForm extends Form
{
/**
* [init description]
*
* #return void
*/
public function init()
{
$this->setHydrator(
new DoctrineHydrator($this->objectManager, 'YrmUser\Entity\Role')
)->setObject(new Role());
$this->setAttribute('method', 'post');
$this->add(
array(
'name' => 'name',
'attributes' => array(
'type' => 'text',
'placeholder' =>'Name',
),
'options' => array(
'label' => 'Name',
),
)
);
$this->add(
array(
'type' => 'DoctrineModule\Form\Element\ObjectSelect',
'name' => 'parent',
'attributes' => array(
'id' => 'parent_id',
),
'options' => array(
'label' => 'Parent',
'object_manager' => $this->objectManager,
'property' => 'name',
'is_method' => true,
'empty_option' => '-- none --',
'target_class' => 'YrmUser\Entity\Role',
'is_method' => true,
'find_method' => array(
'name' => 'findBy',
'params' => array(
'criteria' => array('parent' => null),
),
),
),
)
);
}
}
The hydration for the select in the form works as it only shows other roles that don't have a parent.
But when editing a existing entity it shows itself in the select so i can select itself as its parent.
I figured if i would have the id of current entity inside the form i can create a custom repo with a method that retrieves all roles without a parent and does not have the current entity id.
But i cant figure out how to get the id of the currently edited entity from inside the form.
Any help is appreciated.
Cheers,
Yrm

Answer 1

You can fetch the bound entity within the form using $this->getObject().
You have actually already set this with setObject(new Role());. Unfortunately this means that it was not loaded via Doctine and you will have the same issue, no $id to work with.
Therefore you will need to add the 'parent role' options (value_options) after you have bound the role loaded via doctrine.
From within the controller, I normally request the 'edit' form from a service class and pass in the entity instance or id that is being edited. Once set you can then modify existing form elements before passing it back to the controller.
// Controller
class RoleController
{
public function editAction()
{
$id = $this->params('id'); // assumed id passed as param
$service = $this->getRoleService();
$form = $service->getRoleEditForm($id); // Pass the id into the getter
// rest of the controller...
}
}
By passing in the $id when you fetch the form you can then, within a service, modify the form elements for that specific role.
class RoleService implements ObjectManagerAwareInterface, ServiceLocatorAwareInterface
{
protected function loadParentRolesWithoutThisRole(Role $role);
public function getRoleEditForm($id)
{
$form = $this->getServiceLocator()->get('Role\Form\RoleEditForm');
if ($id) {
$role = $this->getObjectManager()->find('Role', $id);
$form->bind($role); // calls $form->setObject() internally
// Now the correct entity is attached to the form
// Load the roles excluding the current
$roles = $this->loadParentRolesWithoutThisRole($role);
// Find the parent select element and set the options
$form->get('parent')->setValueOptions($roles);
}
// Pass form back to the controller
return $form;
}
}
By loading the options after the form has initialized you do not need the current DoctrineModule\Form\Element\ObjectSelect. A normal Select element that has no default value_options defined should be fine.