UPGRADE FROM 2.7 to 2.8

Form

The "cascade_validation" option was deprecated. Use the "constraints" option together with the Valid constraint instead. Contrary to "cascade_validation", "constraints" must be set on the respective child forms, not the parent form.

Before:

$form = $this->createFormBuilder($article, array('cascade_validation' => true))
    ->add('author', new AuthorType())
    ->getForm();

After:

use Symfony\Component\Validator\Constraints\Valid;

$form = $this->createFormBuilder($article)
    ->add('author', new AuthorType(), array(
        'constraints' => new Valid(),
    ))
    ->getForm();

Alternatively, you can set the Valid constraint in the model itself:

use Symfony\Component\Validator\Constraints as Assert;

class Article
{
    /**
     * @Assert\Valid
     */
    private $author;
}

Type names were deprecated and will be removed in Symfony 3.0. Instead of referencing types by name, you should reference them by their fully-qualified class name (FQCN) instead. With PHP 5.5 or later, you can use the "class" constant for that:

Before:

$form = $this->createFormBuilder()
    ->add('name', 'text')
    ->add('age', 'integer')
    ->getForm();

After:

use Symfony\Component\Form\Extension\Core\Type\IntegerType;
use Symfony\Component\Form\Extension\Core\Type\TextType;

$form = $this->createFormBuilder()
    ->add('name', TextType::class)
    ->add('age', IntegerType::class)
    ->getForm();

As a further consequence, the method FormTypeInterface::getName() was deprecated and will be removed in Symfony 3.0. You should remove this method from your form types.

If you want to customize the block prefix of a type in Twig, you should now implement FormTypeInterface::getBlockPrefix() instead:

Before:

class UserProfileType extends AbstractType
{
    public function getName()
    {
        return 'profile';
    }
}

After:

class UserProfileType extends AbstractType
{
    public function getBlockPrefix()
    {
        return 'profile';
    }
}

If you don't customize getBlockPrefix(), it defaults to the class name without "Type" suffix in underscore notation (here: "user_profile").

If you want to create types that are compatible with Symfony 2.3 up to 2.8 and don't trigger deprecation errors, implement both getName() and getBlockPrefix():

class ProfileType extends AbstractType
{
    public function getName()
    {
        return $this->getBlockPrefix();
    }

    public function getBlockPrefix()
    {
        return 'profile';
    }
}

If you define your form types in the Dependency Injection configuration, you should further remove the "alias" attribute:

Before:

<service id="my.type" class="Vendor\Type\MyType">
    <tag name="form.type" alias="mytype" />
</service>

After:

<service id="my.type" class="Vendor\Type\MyType">
    <tag name="form.type" />
</service>

Type extension should return the fully-qualified class name of the extended type from FormTypeExtensionInterface::getExtendedType() now.

Before:

class MyTypeExtension extends AbstractTypeExtension
{
    public function getExtendedType()
    {
        return 'form';
    }
}

After:

use Symfony\Component\Form\Extension\Core\Type\FormType;

class MyTypeExtension extends AbstractTypeExtension
{
    public function getExtendedType()
    {
        return FormType::class;
    }
}

If your extension has to be compatible with Symfony 2.3-2.8, use the following statement:

use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\Extension\Core\Type\FormType;

class MyTypeExtension extends AbstractTypeExtension
{
    public function getExtendedType()
    {
        return method_exists(AbstractType::class, 'getBlockPrefix') ? FormType::class : 'form';
    }
}

Returning type instances from FormTypeInterface::getParent() is deprecated and will not be supported anymore in Symfony 3.0. Return the fully-qualified class name of the parent type class instead.

Before:

class MyType
{
    public function getParent()
    {
        return new ParentType();
    }
}

After:

class MyType
{
    public function getParent()
    {
        return ParentType::class;
    }
}

Passing type instances to Form::add(), FormBuilder::add() and the FormFactory::create*() methods is deprecated and will not be supported anymore in Symfony 3.0. Pass the fully-qualified class name of the type instead.

Before:
```
$form = $this->createForm(new MyType());
```
After:
```
$form = $this->createForm(MyType::class);
```
Registering type extensions as a service with an alias which does not match the type returned by getExtendedType is now forbidden. Fix your implementation to define the right type.

The alias option of the form.type_extension tag is deprecated in favor of the extended_type/extended-type option.

Before:

<service id="app.type_extension" class="Vendor\Form\Extension\MyTypeExtension">
    <tag name="form.type_extension" alias="text" />
</service>

After:

<service id="app.type_extension" class="Vendor\Form\Extension\MyTypeExtension">
    <tag name="form.type_extension" extended-type="Symfony\Component\Form\Extension\Core\Type\TextType" />
</service>

Translator

The getMessages() method of the Symfony\Component\Translation\Translator was deprecated and will be removed in Symfony 3.0. You should use the getCatalogue() method of the Symfony\Component\Translation\TranslatorBagInterface.

Before:

$messages = $translator->getMessages();

After:

 $catalogue = $translator->getCatalogue($locale);
 $messages = $catalogue->all();

 while ($catalogue = $catalogue->getFallbackCatalogue()) {
     $messages = array_replace_recursive($catalogue->all(), $messages);
 }

DependencyInjection

The concept of scopes were deprecated, the deprecated methods are:
- Symfony\Component\DependencyInjection\ContainerBuilder::getScopes()
- Symfony\Component\DependencyInjection\ContainerBuilder::getScopeChildren()
- Symfony\Component\DependencyInjection\ContainerInterface::enterScope()
- Symfony\Component\DependencyInjection\ContainerInterface::leaveScope()
- Symfony\Component\DependencyInjection\ContainerInterface::addScope()
- Symfony\Component\DependencyInjection\ContainerInterface::hasScope()
- Symfony\Component\DependencyInjection\ContainerInterface::isScopeActive()
- Symfony\Component\DependencyInjection\Definition::setScope()
- Symfony\Component\DependencyInjection\Definition::getScope()
- Symfony\Component\DependencyInjection\Reference::isStrict()

Also, the $scope and $strict parameters of Symfony\Component\DependencyInjection\ContainerInterface::set() and Symfony\Component\DependencyInjection\Reference respectively were deprecated.

A new shared flag has been added to the service definition in replacement of the prototype scope.

Before:

use Symfony\Component\DependencyInjection\ContainerBuilder;

$container = new ContainerBuilder();
$container
    ->register('foo', 'stdClass')
    ->setScope(ContainerBuilder::SCOPE_PROTOTYPE)
;

services:
    foo:
        class: stdClass
        scope: prototype

<services>
    <service id="foo" class="stdClass" scope="prototype" />
</services>

After:

use Symfony\Component\DependencyInjection\ContainerBuilder;

$container = new ContainerBuilder();
$container
    ->register('foo', 'stdClass')
    ->setShared(false)
;

services:
    foo:
        class: stdClass
        shared: false

<services>
    <service id="foo" class="stdClass" shared="false" />
</services>

WebProfiler

The profiler:import and profiler:export commands have been deprecated and will be removed in 3.0.

The web development toolbar has been completely redesigned. This update has introduced some changes in the HTML markup of the toolbar items.

Before:

Information was wrapped with simple <span> elements:

{% block toolbar %}
    {% set icon %}
        <span>
            <svg ...></svg>
            <span>{{ '%.1f'|format(collector.memory / 1024 / 1024) }} MB</span>
        </span>
    {% endset %}
{% endblock %}

After:

Information is now semantically divided into values and labels according to the class attribute of each <span> element:

{% block toolbar %}
    {% set icon %}
        <svg ...></svg>
        <span class="sf-toolbar-value">
            {{ '%.1f'|format(collector.memory / 1024 / 1024) }}
        </span>
        <span class="sf-toolbar-label">MB</span>
    {% endset %}
{% endblock %}

Most of the blocks designed for the previous toolbar will still be displayed correctly. However, if you want to support both the old and the new toolbar, it's better to make use of the new profiler_markup_version variable passed to the toolbar templates:

{% block toolbar %}
    {% set profiler_markup_version = profiler_markup_version|default(1) %}

    {% set icon %}
        {% if profiler_markup_version == 1 %}

            {# code for the original toolbar #}

        {% else %}

            {# code for the new toolbar (Symfony 2.8+) #}

        {% endif %}
    {% endset %}
{% endblock %}

All the profiler storages different than FileProfilerStorage have been deprecated. The deprecated classes are:
- Symfony\Component\HttpKernel\Profiler\BaseMemcacheProfilerStorage
- Symfony\Component\HttpKernel\Profiler\MemcachedProfilerStorage
- Symfony\Component\HttpKernel\Profiler\MemcacheProfilerStorage
- Symfony\Component\HttpKernel\Profiler\MongoDbProfilerStorage
- Symfony\Component\HttpKernel\Profiler\MysqlProfilerStorage
- Symfony\Component\HttpKernel\Profiler\PdoProfilerStorage
- Symfony\Component\HttpKernel\Profiler\RedisProfilerStorage
- Symfony\Component\HttpKernel\Profiler\SqliteProfilerStorage
The alternative solution is to use the FileProfilerStorage or create your own storage implementing the ProfileStorageInterface.

FrameworkBundle

The default value of the parameter session.cookie_httponly is now true. It prevents scripting languages, such as JavaScript to access the cookie, which help to reduce identity theft through XSS attacks. If your application needs to access the session cookie, override this parameter:
```
framework:
    session:
        cookie_httponly: false
```

Security

The AbstractToken::isGranted() method was deprecated. Instead, override the voteOnAttribute() method. This method has one small difference: it's passed the TokenInterface instead of the user:

Before:

class MyCustomVoter extends AbstractVoter
{
    // ...

    protected function isGranted($attribute, $object, $user = null)
    {
        // ...
    }
}

After:

class MyCustomVoter extends AbstractVoter
{
    // ...

    protected function voteOnAttribute($attribute, $object, TokenInterface $token)
    {
        $user = $token->getUser();
        // ...
    }
}

Config

The \Symfony\Component\Config\Resource\ResourceInterface::isFresh() method has been deprecated and will be removed in Symfony 3.0 because it assumes that resource implementations are able to check themselves for freshness.

If you have custom resources that implement this method, change them to implement the \Symfony\Component\Config\Resource\SelfCheckingResourceInterface sub-interface instead of \Symfony\Component\Config\Resource\ResourceInterface.

Before:
```
use Symfony\Component\Config\Resource\ResourceInterface;

class MyCustomResource implements ResourceInterface { ... }
```
After:
```
use Symfony\Component\Config\Resource\SelfCheckingResourceInterface;

class MyCustomResource implements SelfCheckingResourceInterface { ... }
```
Additionally, if you have implemented cache validation strategies using isFresh() yourself, you should have a look at the new cache validation system based on ResourceCheckers.

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UPGRADE-2.8.md

UPGRADE-2.8.md

UPGRADE FROM 2.7 to 2.8

Form

Translator

DependencyInjection

WebProfiler

FrameworkBundle

Security

Config

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UPGRADE FROM 2.7 to 2.8

Form

Translator

DependencyInjection

WebProfiler

FrameworkBundle

Security

Config