access entity property from type_options - symfony

Question

In my entity I defined a field color with a callback. The colors can only be selected in the COLORS list (const in this class)
/**
* #ORM\Entity(repositoryClass="App\Repository\EventTagRepository")
*/
class EventTag
{
const COLORS = [
"primary"=>"primary",
"secondary"=>"secondary",
"success"=> "success",
"danger"=>"danger",
"warning"=>"warning",
"info"=>"info",
"light"=>"light",
"dark"=>"dark"
];
/**
* #ORM\Column(type="string", length=255)
* #Assert\Choice(callback="getColors")
*/
private $color;
public function getColors()
{
return $this::COLORS;
}
When I'm creating the form in easy-admin, I'd like to access this callback in the choice type options to prevent the user to choose a wrong color.
EventTag:
class: App\Entity\EventTag
list:
actions: ['-delete']
form:
fields:
- { type: 'group', label: 'Content', icon: 'pencil-alt', columns: 8 }
- 'name'
- { property: 'color', type: 'choice', type_options: { expanded: false, multiple: false, choices: 'colors'} }
Unfortunately in the type_options I didn't find a way to access the entity properties, instead of searching for getColors(), IsColors(), hasColors() methods, it only reads the string.
Is it possible to do it another way ?

Answer 1

The callback refers to an entity const:
you can use
#Assert\Choice(choices=EventTag::COLORS)
in the PHP entity and
choices: App\Entity\EventTag::COLORS
in the YAML config
the callback refers to a more specific value:
you need to manually extend the AdminController
public function createCategoryEntityFormBuilder($entity, $view)
{
$formBuilder = parent::createEntityFormBuilder($entity, $view);
$field = $formBuilder->get('type');
$options = $field->getOptions();
$attr = $field->getAttributes();
$options['choices'] = $formBuilder->getData()->getTypeLabels();
$formBuilder->add($field->getName(), ChoiceType::class, $options);
$formBuilder->get($field->getName())
->setAttribute('easyadmin_form_tab', $attr['easyadmin_form_tab'])
->setAttribute('easyadmin_form_group', $attr['easyadmin_form_group']);
return $formBuilder;
}
As $formBuilder->add erases attributes we need to set them again manually. Probably it can be skipped if you are not using Groups/Tabs, otherwise it will throw Exception saying that field was already rendered.