symfony/UPGRADE-4.4.md

UPGRADE FROM 4.3 to 4.4
=======================

Cache
-----

 * Added argument `$prefix` to `AdapterInterface::clear()`

Debug
-----

 * Deprecated the `Debug` class, use the one from the `ErrorRenderer` component instead
 * Deprecated the `FlattenException` class, use the one from the `ErrorRenderer` component instead
 * Deprecated the component in favor of the `ErrorHandler` component

DependencyInjection
-------------------

 * Deprecated support for short factories and short configurators in Yaml

   Before:
   ```yaml
   services:
     my_service:
       factory: factory_service:method
   ```

   After:
   ```yaml
   services:
     my_service:
       factory: ['@factory_service', method]
   ```
 * Deprecated `tagged` in favor of `tagged_iterator`

   Before:
   ```yaml
   services:
       App\Handler:
           tags: ['app.handler']

       App\HandlerCollection:
           arguments: [!tagged app.handler]
   ```

   After:
   ```yaml
   services:
       App\Handler:
       tags: ['app.handler']

   App\HandlerCollection:
       arguments: [!tagged_iterator app.handler]
   ```

 * Passing an instance of `Symfony\Component\DependencyInjection\Parameter` as class name to `Symfony\Component\DependencyInjection\Definition` is deprecated.

   Before:
   ```php
   new Definition(new Parameter('my_class'));
   ```

   After:
   ```php
   new Definition('%my_class%');
   ```
   
DoctrineBridge
--------------
 * Deprecated injecting `ClassMetadataFactory` in `DoctrineExtractor`, an instance of `EntityManagerInterface` should be
   injected instead.
 * Deprecated passing an `IdReader` to the `DoctrineChoiceLoader` when the query cannot be optimized with single id field.
 * Deprecated not passing an `IdReader` to the `DoctrineChoiceLoader` when the query can be optimized with single id field.
 * Deprecated `RegistryInterface`, use `Doctrine\Common\Persistence\ManagerRegistry`.

Filesystem
----------

 * Support for passing a `null` value to `Filesystem::isAbsolutePath()` is deprecated.

Form
----

 * Using different values for the "model_timezone" and "view_timezone" options of the `TimeType` without configuring a
   reference date is deprecated.
 * Using `int` or `float` as data for the `NumberType` when the `input` option is set to `string` is deprecated.
 * Overriding the methods `FormIntegrationTestCase::setUp()`, `TypeTestCase::setUp()` and `TypeTestCase::tearDown()` without the `void` return-type is deprecated.

FrameworkBundle
---------------

 * Deprecated booting the kernel before running `WebTestCase::createClient()`.
 * Deprecated support for `templating` engine in `TemplateController`, use Twig instead
 * The `$parser` argument of `ControllerResolver::__construct()` and `DelegatingLoader::__construct()`
   has been deprecated.
 * The `ControllerResolver` and `DelegatingLoader` classes have been marked as `final`.
 * The `controller_name_converter` and `resolve_controller_name_subscriber` services have been deprecated.
 * Deprecated `routing.loader.service`, use `routing.loader.container` instead.
 * Not tagging service route loaders with `routing.route_loader` has been deprecated.
 * Overriding the methods `KernelTestCase::tearDown()` and `WebTestCase::tearDown()` without the `void` return-type is deprecated.
 
HttpClient
----------

 * Added method `cancel()` to `ResponseInterface`

HttpFoundation
--------------

 * `ApacheRequest` is deprecated, use `Request` class instead.
 * Passing a third argument to `HeaderBag::get()` is deprecated since Symfony 4.4, use method `all()` instead
 * `PdoSessionHandler` now precalculates the expiry timestamp in the lifetime column,
    make sure to run `CREATE INDEX EXPIRY ON sessions (sess_lifetime)` to update your database
    to speed up garbage collection of expired sessions.

HttpKernel
----------

 * The `DebugHandlersListener` class has been marked as `final`
 * Added new Bundle directory convention consistent with standard skeletons:

    ```
    └── MyBundle/
        ├── config/
        ├── public/
        ├── src/
        │   └── MyBundle.php
        ├── templates/
        └── translations/
    ```

   To make this work properly, it is necessary to change the root path of the bundle:

    ```php
    class MyBundle extends Bundle
    {
        public function getPath(): string
        {
            return \dirname(__DIR__);
        }
    }
    ```

   As many bundles must be compatible with a range of Symfony versions, the current 
   directory convention is not deprecated yet, but it will be in the future.

Lock
----

 * Deprecated `Symfony\Component\Lock\StoreInterface` in favor of `Symfony\Component\Lock\BlockingStoreInterface` and
   `Symfony\Component\Lock\PersistingStoreInterface`.
 * `Factory` is deprecated, use `LockFactory` instead

Messenger
---------

 * Deprecated passing a `ContainerInterface` instance as first argument of the `ConsumeMessagesCommand` constructor,
   pass a `RoutableMessageBus`  instance instead.

MonologBridge
--------------

 * The `RouteProcessor` has been marked final.
 
Process
-------

 * Deprecated the `Process::inheritEnvironmentVariables()` method: env variables are always inherited.

PropertyAccess
--------------

 * Deprecated passing `null` as 2nd argument of `PropertyAccessor::createCache()` method (`$defaultLifetime`), pass `0` instead.

Routing
-------

 * Deprecated `ServiceRouterLoader` in favor of `ContainerLoader`.
 * Deprecated `ObjectRouteLoader` in favor of `ObjectLoader`.

Security
--------

 * The `LdapUserProvider` class has been deprecated, use `Symfony\Component\Ldap\Security\LdapUserProvider` instead.
 * Implementations of `PasswordEncoderInterface` and `UserPasswordEncoderInterface` should add a new `needsRehash()` method

Stopwatch
---------

 * Deprecated passing `null` as 1st (`$id`) argument of `Section::get()` method, pass a valid child section identifier instead.

TwigBridge
----------

 * Deprecated to pass `$rootDir` and `$fileLinkFormatter` as 5th and 6th argument respectively to the
   `DebugCommand::__construct()` method, swap the variables position.
   
TwigBundle
----------

 * Deprecated default value `twig.controller.exception::showAction` of the `twig.exception_controller` configuration option, 
   set it to `null` instead. This will also change the default error response format according to https://tools.ietf.org/html/rfc7807
   for `json`, `xml`, `atom` and `txt` formats:
   
   Before:
   ```json
   { 
       "error": { 
           "code": 404, 
           "message": "Sorry, the page you are looking for could not be found" 
       } 
   }
   ```
   
   After:
   ```json
   { 
       "title": "Not Found",
       "status": 404, 
       "detail": "Sorry, the page you are looking for could not be found"
   }
   ```
   
 * Deprecated the `ExceptionController` and all built-in error templates, use the error renderer mechanism of the `ErrorRenderer` component
 * Deprecated loading custom error templates in non-html formats. Custom HTML error pages based on Twig keep working as before: 

   Before (`templates/bundles/TwigBundle/Exception/error.jsonld.twig`):
   ```twig
   { 
     "@id": "https://example.com",
     "@type": "error",
     "@context": {
         "title": "{{ status_text }}",
         "code": {{ status_code }},
         "message": "{{ exception.message }}"
     }
   }
   ```
   
   After (`App\ErrorRenderer\JsonLdErrorRenderer`):
   ```php
   class JsonLdErrorRenderer implements ErrorRendererInterface
   {
     public static function getFormat(): string
     {
         return 'jsonld';
     }
   
     public function render(FlattenException $exception): string
     {
         return json_encode([
             '@id' => 'https://example.com',
             '@type' => 'error',
             '@context' => [
                 'title' => $exception->getTitle(),
                 'code' => $exception->getStatusCode(),
                 'message' => $exception->getMessage(),
             ],
         ]);
     }
   }
   ```

  Configure your rendering service tagging it with `error_renderer.renderer`.

Validator
---------

 * Deprecated passing an `ExpressionLanguage` instance as the second argument of `ExpressionValidator::__construct()`.
 * Deprecated using anything else than a `string` as the code of a `ConstraintViolation`, a `string` type-hint will
   be added to the constructor of the `ConstraintViolation` class and to the `ConstraintViolationBuilder::setCode()`
   method in 5.0.
 * Deprecated passing an `ExpressionLanguage` instance as the second argument of `ExpressionValidator::__construct()`. 
   Pass it as the first argument instead.
 * The `Length` constraint expects the `allowEmptyString` option to be defined
   when the `min` option is used.
   Set it to `true` to keep the current behavior and `false` to reject empty strings.
   In 5.0, it'll become optional and will default to `false`.
 * Overriding the methods `ConstraintValidatorTestCase::setUp()` and `ConstraintValidatorTestCase::tearDown()` without the `void` return-type is deprecated.

WebProfilerBundle
-----------------

 * Deprecated the `ExceptionController` class in favor of `ExceptionErrorController`
 * Deprecated the `TemplateManager::templateExists()` method

WebServerBundle
---------------

 * The bundle is deprecated and will be removed in 5.0.