Symfony does not validate object constraints

Question

I have a Silex project where i use the FormServiceProvider and ValidatorServiceProvider. I have made a form with the form.factory builder, added fields, and use an object as dataset:

$form = $app['form.factory']->createBuilder('form', $object)

I then try to validate the form on submition the "normal way":

if ($app['request']->getMethod() == 'POST') {
    $form->bind($app['request']);
    if ($form->isValid()) {
        (...)
    }
}

In the object, i have added a loadValidatorMetadata static method:

static public function loadValidatorMetadata(ClassMetadata $metadata) {
    $metadata->addPropertyConstraint('name', new Assert\MinLength(5, array('message' => 'Name too short')));
}

When I submit the form with a shorter name field, isValid still return true. If I run a validate method on the object like this:

$errors = $app['validator']->validate($object)

it returns an error based on the constraint, but the form isValid does not find this error. When i looked into the symfony Form class, i found that isValid skips checking child fields when the disable config is true. This is the case for my form, but I have no idea why. I have just registered the Silex service providers the normal way without any special config. Any idea how to make the form fail validation based on the object constraints?

ooXei1sh ooXei1sh · Accepted Answer · 2015-09-06T22:14:59

The following seems to be working fine in my Silex setup. Maybe you just needed to call the $form->handleRequest() method?

Controller

$app->match('/form', function (Request $request) use ($app) {

    $object = new \My\Namespaced\Entity\Object();

    $form = $app['form.factory']->createBuilder('form', $object)
        ->add('name')
        ->add('submit', 'submit')
        ->getForm();

    $form->handleRequest($request);
    if ($form->isValid()) {
        $app['session']->getFlashBag()->add('success', 'Success flash message');
    }
    else {
        $app['session']->getFlashBag()->add('danger', 'Error flash message');
    }

    return new Response($app['twig']->render('form.html.twig', array(
        'form' => $form->createView(),
    )));   

})->bind('form');

Object Class

<?php

namespace My\Namespaced\Entity;

use Symfony\Component\Validator\Mapping\ClassMetadata;
use Symfony\Component\Validator\Constraints as Assert;

class Object 
{
    private $name;

    static public function loadValidatorMetadata(ClassMetadata $metadata) {
        $metadata->addPropertyConstraint('name', new Assert\Length(array(
            'min' => 5,
            'minMessage' => 'Name too short',
        )))
        ->addPropertyConstraint('name', new Assert\NotBlank(array(
            'message' => 'Name is required field.'
        )));
    }

    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    public function getName()
    {
        return $this->name;
    }
}

Twig Template

{% extends 'layout.html.twig' %}
{% block content %}
    {{ form(form, {action: path('form'), attr:{ 'novalidate': 'novalidate' }}) }}
{% endblock %}

Symfony does not validate object constraints

1 Answers