symfony3 Validation Symfony validation using YAML

Example

• Create an Entity in AppBundle/Entity directory. You can do this manually, or by using Symfony's command php bin/console doctrine:generate:entity and filling in the required information in each step. You must specify yml option at Configuration format (yml, xml, php or annotation) step.

<?php
# AppBundle/Entity/Person.php

namespace AppBundle\Entity;

/**
 * Person
 */
class Person
{
    /**
     * @var int
     */
    private $id;

    /**
     * @var string
     */
    private $name;

    /**
     * @var int
     */
    private $age;


    /**
     * Get id
     *
     * @return int
     */
    public function getId()
    {
        return $this->id;
    }

    /**
     * Set name
     *
     * @param string $name
     *
     * @return Person
     */
    public function setName($name)
    {
        $this->name = $name;

        return $this;
    }

    /**
     * Get name
     *
     * @return string
     */
    public function getName()
    {
        return $this->name;
    }

    /**
     * Set age
     *
     * @param integer $age
     *
     * @return Person
     */
    public function setAge($age)
    {
        $this->age = $age;

        return $this;
    }

    /**
     * Get age
     *
     * @return int
     */
    public function getAge()
    {
        return $this->age;
    }
}

• Create the Entity mapping information for the Entity class. If you are using Symfony's command php bin/console doctrine:generate:entity, then the following code will be auto-generated. Otherwise, if you don't use the command, you can create the following code by hand.

# AppBundle/Resources/config/doctrine/Person.orm.yml

AppBundle\Entity\Person:
type: entity
table: persons
repositoryClass: AppBundle\Repository\PersonRepository
id:
    id:
        type: integer
        id: true
        generator:
            strategy: AUTO
fields:
    name:
        type: string
        length: '50'
    age:
        type: integer
lifecycleCallbacks: {  }

• Create the validation for the Entity class.

# AppBundle/Resources/config/validation/person.yml

AppBundle\Entity\Person:
    properties:
        name:
            - NotBlank:
                message: "Name is required"
            - Length:
                min: 3
                max: 50
                minMessage: "Please use at least 3 chars"
                maxMessage: "Please use max 50 chars"
            - Regex:
                pattern: "/^[A-Za-z]+$/"
                message: "Please use only letters"
        age:
            - NotBlank:
                message: "Age is required"
            - Length:
                min: 1
                max: 3
                minMessage: "The age must have at least 1 number in length"
                maxMessage: "The age must have max 3 numbers in length"
            - Regex:
                pattern: "/^[0-9]+$/"
                message: "Please use only numbers"

• Create a new form in AppBundle/Form directory.

<?php
# AppBundle/Form/PersonType.php

namespace AppBundle\Form;

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\OptionsResolver\OptionsResolverInterface;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\IntegerType;

class PersonType extends AbstractType
{
    /**
     * @param FormBuilderInterface $builder
     * @param array $options
     */
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('name', TextType::class, ['label'=>'Name'])
            ->add('age', IntegerType::class, ['label'=>'Age'])
        ;
    }

    /**
     * @param OptionsResolver $resolver
     */
    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults(array(
            'data_class' => 'AppBundle\Entity\Person'
        ));
    }

    public function setDefaultOptions(OptionsResolverInterface $resolver)
    {
        // TODO: Implement setDefaultOptions() method.
    }

    public function getName()
    {
        return 'person_form';
    }
}

• Create a new route in AppBundle/Resources/config/routing.yml

app_person:
    path: /person
    defaults: { _controller: AppBundle:Default:person }

• Now create a new action method for that route.

<?php
# AppBundle/Controller/DefaultController.php

namespace AppBundle\Controller;

use Symfony\Bundle\FrameworkBundle\Controller\Controller;
use Symfony\Component\HttpFoundation\Request;
use AppBundle\Entity\Person;
use AppBundle\Form\PersonType;

class DefaultController extends Controller
{
    public function personAction(Request $request)
    {
        $person = new Person();

        $form = $this->createForm(
            PersonType::class,
            $person,
            [
                'action' => $this->generateUrl('app_person'),
                'method'=>'POST',
                'attr'=>[
                    'id'=>'form_person',
                    'class'=>'person_form'
                ]
            ]
        );

        $form->handleRequest($request);

        return $this->render(
            'AppBundle:Default:person.html.twig', [
                'form'=>$form->createView()
            ]
        );
    }
}

• Create the view in AppBundle/Resources/views/Default/person.html.twig

{% extends '::base.html.twig' %}

{% block body %}
    {{ form_start(form, {'attr': {'novalidate':'novalidate'}}) }}
        {{ form_row(form.name) }}
        {{ form_row(form.age) }}
        <button type="submit">Go</button>
    {{ form_end(form) }}
{% endblock %}

• Start Symfony's built-in server (php bin/console server:run) and access 127.0.0.1:8000/person route in your browser. There should be a form consisting of two input boxes and a submit button. If you press the submit button without entering any data into the input boxes, then the error messages will be displayed.