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POPass custom parameters to custom ValidationConstraint in Symfony2
 

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  1. POPass custom parameters to custom ValidationConstraint in Symfony2
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    <p>I'm creating a form in Symfony2. The form only contains one <code>book</code> field which allows the user to choose between a list of <code>Books</code> entities. I need to check whether the selected <code>Book</code> belongs to an <code>Author</code> I have in my controller.</p> <pre class="lang-php prettyprint-override"><code>public class MyFormType extends AbstractType { protected $author; public function __construct(Author $author) { $this-&gt;author = $author; } public function buildForm(FormBuilderInterface $builder, array $options) { $builder-&gt;add('book', 'entity', array('class' =&gt; 'AcmeDemoBundle:Book', 'field' =&gt; 'title'); } // ... } </code></pre> <p>I want to check, after submitting the form, that the selected <code>Book</code> is written by the <code>$author</code> in my controller:</p> <pre class="lang-php prettyprint-override"><code>public class MyController { public function doStuffAction() { $author = ...; $form = $this-&gt;createForm(new MyFormType($author)); $form-&gt;bind($this-&gt;getRequest()); // ... } } </code></pre> <p>Unfortunately, I cannot find any way to do that. I tried creating a custom validator constraint as explained in <a href="http://symfony.com/doc/master/cookbook/validation/custom_constraint.html" rel="noreferrer">The Cookbook</a>, but while I can pass the <code>EntityManager</code> as parameter by defining the validator as a service, I cannot pass the <code>$author</code> from the controller to the validator constraint.</p> <pre class="lang-php prettyprint-override"><code>class HasValidAuthorConstraintValidator extends ConstraintValidator { private $entityManager; public function __construct(EntityManager $entityManager) { $this-&gt;entityManager = $entityManager; } public function validate($value, Constraint $constraint) { $book = $this-&gt;entityManager-&gt;getRepository('book')-&gt;findOneById($value); $author = ...; // That's the data I'm missing if(!$book-&gt;belongsTo($author)) { $this-&gt;context-&gt;addViolation(...); } } } </code></pre> <p><a href="https://stackoverflow.com/questions/10514301/custom-validator-constraint-with-arguments-parameters-in-symfony-2">This solution</a> could be exactly the one that I was looking for, but my form is not bound to an Entity and is not meant to be (I'm getting the data from the <code>getData()</code> method).</p> <p>Is there a solution to my problem ? This must be a common case but I really don't know how to solve it.</p>
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