Overriding Default FOSUserBundle Forms
======================================

## Overriding a Form Type

The default forms packaged with the FOSUserBundle provide functionality for 
registering new user, updating your profile, changing your password and 
much more. These forms work well with the bundle's default classes and controllers. 
But, as you start to add more properties to your `User` 
class or you decide you want to add a few options to the registration form you 
will find that you need to override the forms in the bundle.

Suppose that you have created an ORM user class with the following class name, 
`Acme\UserBundle\Entity\User`. In this class, you have added a `name` property 
because you would like to save the user's name as well as their username and 
email address. Now, when a user registers for your site they should enter in their 
name as well as their username, email and password. Below is an example `$name` 
property and its validators.

``` php
// src/Acme/UserBundle/Entity/User.php
<?php

use FOS\UserBundle\Entity\User as BaseUser;
use Doctrine\ORM\Mapping as ORM;
use Symfony\Component\Validator\Constraints as Assert;

class User extends BaseUser
{
    /**
     * @ORM\Id
     * @ORM\Column(type="integer")
     * @ORM\GeneratedValue(strategy="AUTO")
     */
    protected $id;
    
    /**
     * @ORM\Column(type="string", length="255")
     *
     * @Assert\NotBlank(message="Please enter your name.", groups={"Registration", "Profile"})
     * @Assert\MinLength(limit="3", message="The name is too short.", groups={"Registration", "Profile"})
     * @Assert\MaxLength(limit="255", message="The name is too long.", groups={"Registration", "Profile"})
     */
    protected $name;

    // ...
}
```

**Note:**

```
By default, the Registration validation group is used when validating a new 
user registration. Unless you have overriden this value in the configuration, 
make sure you add the validation group named Registration to your name property.
```

If you try and register using the default registration form you will find that 
your new `name` property is not part of the form. You need to create a custom 
form type and configure the bundle to use it.

The first step is to create a new form type in your own bundle. The following 
class extends the base FOSUserBundle `RegistrationFormType` and then adds the 
custom `name` field.

``` php
// src/Acme/UserBundle/Form/Type/RegistrationFormType.php
<?php

namespace Acme\UserBundle\Form\Type;

use Symfony\Component\Form\FormBuilder;
use FOS\UserBundle\Form\Type\RegistrationFormType as BaseType;

class RegistrationFormType extends BaseType
{
    public function buildForm(FormBuilder $builder, array $options)
    {
        parent::buildForm($builder, $options);

        // add your custom field
        $builder->add('name');
    }

    public function getName()
    {
        return 'acme_user_registration';
    }
}
```

Now that you have created your custom form type, you must declare it as a service 
and add a tag to it. The tag must have a `name` value of `form.type` and an `alias` 
value that is the equal to the string returned from the `getName` method of your 
form type class. The `alias` that you specify is what you will use in the FOSUserBundle 
configuration to let the bundle know that you want to use your custom form.

Below is an example of configuring your form type as a service in XML:

``` xml
<!-- src/Acme/UserBundle/Resources/config/services.xml -->
<?xml version="1.0" encoding="UTF-8" ?>

<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>

        <service id="acme_user.registration.form.type" class="Acme\UserBundle\Form\Type\RegistrationFormType">
            <tag name="form.type" alias="acme_user_registration" />
            <argument>%fos_user.model.user.class%</argument>
        </service>

    </services>

</container>
```

Or if you prefer YAML:

``` yaml
# src/Acme/UserBundle/Resources/config/services.yml
services:
    acme_user.registration.form.type:
        class: Acme\UserBundle\Form\Type\RegistrationFormType
        arguments: [%fos_user.model.user.class%]
        tags:
            - { name: form.type, alias: acme_user_registration }
```

**Note:**

```
In the form type service configuration you have specified the `fos_user.model.user.class` 
container parameter as a constructor argument. Unless you have redefined the 
constructor in your form type class, you must include this argument as it is a 
requirement of the FOSUserBundle form type that you extended.
```

Finally, you must update the configuration of the FOSUserBundle so that it will 
use your form type instead of the default one. Below is the configuration for 
changing the registration form type in YAML.

``` yaml
# app/config/config.yml
fos_user:
    # ...
    registration:
        form:
            type: acme_user_registration
```

Note how the `alias` value used in your form type's service configuration tag 
is used in the bundle configuration to tell the FOSUserBundle to use your custom 
form type.

## Overriding Form Handlers

There are two ways to override the default functionality provided by the 
FOSUserBundle form handlers. The easiest way is to  override the `onSuccess` 
method of the handler. The `onSuccess` method is called after the form has been 
bound and validated.

The second way is to override the `process` method. Overriding 
the `process` method should only be necessary when more advanced functionality 
is necessary when binding and validating the form.

Suppose you want to add some functionality that takes place after a successful 
user registration. First you need to create a new class that extends 
`FOS\UserBundle\Form\Handler\RegistrationFormHandler` and then override the 
protected `onSuccess` method.

``` php
// src/Acme/UserBundle/Form/Handler/RegistrationFormHandler.php
<?php

namespace Acme\UserBundle\Form\Handler;

use FOS\UserBundle\Form\Handler\RegistrationFormHandler as BaseHandler;
use FOS\UserBundle\Model\UserInterface;

class RegistrationFormHandler extends BaseHandler
{
    protected function onSuccess(UserInterface $user, $confirmation)
    {
        // Note: if you plan on modifying the user then do it before calling the 
        // parent method as the parent method will flush the changes

        parent::onSuccess($user, $confirmation);

        // otherwise add your functionality here
    }
}
```

**Note:**

```
If you do not call the onSuccess method of the parent class then the default 
logic that the FOSUserBundle handler normally executes upon a successful 
submission will not be performed.
```

You can also choose to override the `process` method of the handler. If you choose 
to override the `process` method then you will be responsible for binding the form 
data and validating it, as well as implementing the logic required upon a 
successful submission.

``` php
// src/Acme/UserBundle/Form/Handler/RegistrationFormHandler.php
<?php

namespace Acme\UserBundle\Form\Handler;

use FOS\UserBundle\Form\Handler\RegistrationFormHandler as BaseHandler;

class RegistrationFormHandler extends BaseHandler
{
    public function process($confirmation = false)  
    {
        $user = $this->userManager->createUser();
        $this->form->setData($user);

        if ('POST' == $this->request->getMethod()) {
            $this->form->bindRequest($this->request);
            if ($this->form->isValid()) {
              
                // do your custom logic here

                return true;
            }
        }

        return false;
    }
}
```

**Note:**

```
The process method should return true for a successful submission and false 
otherwise.
```

Now that you have created and implemented your custom form handler class, you 
must configure it as a service in the container. Below is an example of 
configuring your form handler as a service in XML:

``` xml
<!-- src/Acme/UserBundle/Resources/config/services.xml -->
<?xml version="1.0" encoding="UTF-8" ?>

<container xmlns="http://symfony.com/schema/dic/services"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">

    <services>

        <service id="acme_user.form.handler.registration" class="Acme\UserBundle\Form\Handler\RegistrationFormHandler" scope="request" public="false">
            <argument type="service" id="fos_user.registration.form" />
            <argument type="service" id="request" />
            <argument type="service" id="fos_user.user_manager" />
            <argument type="service" id="fos_user.mailer" />
        </service>

    </services>

</container>
```

Or if you prefer YAML:

``` yaml
# src/Acme/UserBundle/Resources/config/services.yml
services:
    acme_user.form.handler.registration:
        class: Acme\UserBundle\Form\Handler\RegistrationFormHandler
        arguments: ["@fos_user.registration.form", "@request", "@fos_user.user_manager", "@fos_user.mailer"]
        scope: request
        public: false
```

Here you have injected other services as arguments to the constructor of our class 
because these arguments are required by the base FOSUserBundle form handler class 
which you extended.

Now that your new form handler has been configured in the container, all that is 
left to do is update the FOSUserBundle configuration.

``` yaml
# app/config/config.yml
fos_user:
    # ...
    registration:
        form:
            handler: acme_user.form.handler.registration
```

Note how the `id` of your configured service is used in the bundle configuration 
to tell the FOSUserBundle to use your custom form handler.

At this point, when a user registers on your site your service will be used to 
handle the form submission.
