Symfony 2 form + showing data from a relation - forms

Question

I am using Symfony 2 with doctrine. I currently have an entity called Worker and in the Worker entity there is a Many To One relationship with a User entity.
/**
* #ORM\ManyToOne(targetEntity="User")
* #ORM\JoinColumn(name="user_id", referencedColumnName="id")
*/
private $user;
There are more entities like Worker as well such as Manager and such. I want to create a form that creates a Job entity. In the form I am trying to create a select option that selects a Worker, but the worker's name is stored in the user database. Is there any way to print the worker's name from the user database in the form options.
$builder->add('workers','entity', [
'label' => 'Workers:',
'property' => 't.user.firstName',
'empty_value' => 'Choose a Worker',
'class' => 'Company\CompanyBundle\Entity\Worker',
'query_builder' => function (\Company\CompanyBundle\Repository\WorkerRepository $repository) {
return $repository->createQueryBuilder('t')
->add('orderBy', 't.user.firstName ASC');
}
]);
Any ideas?

Answer 1

I think that it would be enoough to do something like this:
$builder->add('workers', 'entity', array(
'class' => 'Company\CompanyBundle\Entity\Worker',
) );
Besides, you should implement a "__toString()" method in your Worker entity where you would return whatever you want to show (in this case, the worker name), so your __toString method in the Worker entity would be something like this:
function __toString() {
return $this->getName();
}
It's the way I usually implement this kind of relations, I hope it helps!

Answer 2

If you prefer, you could do this other option:
$builder->add('workers', 'entity', array(
'class' => 'Company\CompanyBundle\Entity\Worker',
'property' => 'property_name'
));
If you defined the option "property" you don't need implement the "_toString()" in the entity class