Symfony Validation with Data-Transformers - forms

Question

I have a form for a Product entity and I'm putting tags inside it.
I followed the documentation and used a data-transformer : the user enter a space-separated string which is exploded into a Tag collection.
I now want to validate the string that is transformed into the collection so it cannot use meta-characters.
I tried this, but it doesn't work : (cf. symfony2 entity validation regexp a-z A-Z 0-9)
//AppBundle\Entity\Product.php
/**
* #ORM\ManyToMany(targetEntity="Tag", cascade={"persist", "remove"})
* #Assert\Regex(
* pattern="/[\w\s]+/",
* match=true,
* message="Your property should match my damn regex !"
* )
* #ORM\JoinTable(
* name="contenus_tags",
* joinColumns={#ORM\JoinColumn(name="contenu_id", referencedColumnName="id")},
* inverseJoinColumns={#ORM\JoinColumn(name="tag_id", referencedColumnName="id")}
* )
*/
private $tags;
How can I make this ?

Answer 1

Add a validation in the tag class on its name, and a "valid" assertion on tags in your product class:
//AppBundle\Entity\Tag.php
/**
* #Assert\Regex(
* pattern="/^[a-Z0-9]+$/",
* match=true,
* message="Your property should match my damn regex !"
* )
*/
private $name;
//AppBundle\Entity\Product.php
/**
* #ORM\ManyToMany(targetEntity="Tag", cascade={"persist", "remove"})
* #Assert\Valid()
* #Assert\Regex(
* pattern="/[\w\s]+/",
* match=true,
* message="Your property should match my damn regex !"
* )
* #ORM\JoinTable(
* name="contenus_tags",
* joinColumns={#ORM\JoinColumn(name="contenu_id", referencedColumnName="id")},
* inverseJoinColumns={#ORM\JoinColumn(name="tag_id", referencedColumnName="id")}
* )
*/
private $tags;