.. index:: single: Service Container single: DependencyInjection; Container
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Your application is full of useful objects: a "Mailer" object might help you send emails while another object might help you save things to the database. Almost everything that your app "does" is actually done by one of these objects. And each time you install a new bundle, you get access to even more!
In Symfony, these useful objects are called services and each service lives inside a very special object called the service container. The container allows you to centralize the way objects are constructed. It makes your life easier, promotes a strong architecture and is super fast!
The moment you start a Symfony app, your container already contains many services. These are like tools: waiting for you to take advantage of them. In your controller, you can "ask" for a service from the container by type-hinting an argument with the service's class or interface name. Want to :doc:`log </logging>` something? No problem:
// src/Controller/ProductController.php
// ...
use Psr\Log\LoggerInterface;
/**
* @Route("/products")
*/
public function list(LoggerInterface $logger)
{
$logger->info('Look! I just used a service');
// ...
}
What other services are available? Find out by running:
$ php bin/console debug:autowiring
# this is just a *small* sample of the output...
========================================================== ==================================
Class/Interface Type Alias Service ID
========================================================== ==================================
Psr\Cache\CacheItemPoolInterface alias for "cache.app.recorder"
Psr\Log\LoggerInterface alias for "monolog.logger"
Symfony\Component\EventDispatcher\EventDispatcherInterface alias for "debug.event_dispatcher"
Symfony\Component\HttpFoundation\RequestStack alias for "request_stack"
Symfony\Component\HttpFoundation\Session\SessionInterface alias for "session"
Symfony\Component\Routing\RouterInterface alias for "router.default"
========================================================== ==================================
When you use these type-hints in your controller methods or inside your :ref:`own services <service-container-creating-service>`, Symfony will automatically pass you the service object matching that type.
Throughout the docs, you'll see how to use the many different services that live in the container.
Tip
There are actually many more services in the container, and each service has
a unique id in the container, like session or router.default. For a full
list, you can run php bin/console debug:container. But most of the time,
you won't need to worry about this. See :ref:`services-wire-specific-service`.
See :doc:`/service_container/debug`.
.. index:: single: Service Container; Configuring services
You can also organize your own code into services. For example, suppose you need to show your users a random, happy message. If you put this code in your controller, it can't be re-used. Instead, you decide to create a new class:
// src/Service/MessageGenerator.php
namespace App\Service;
class MessageGenerator
{
public function getHappyMessage()
{
$messages = [
'You did it! You updated the system! Amazing!',
'That was one of the coolest updates I\'ve seen all day!',
'Great work! Keep going!',
];
$index = array_rand($messages);
return $messages[$index];
}
}
Congratulations! You've just created your first service class! You can use it immediately inside your controller:
use App\Service\MessageGenerator;
public function new(MessageGenerator $messageGenerator)
{
// thanks to the type-hint, the container will instantiate a
// new MessageGenerator and pass it to you!
// ...
$message = $messageGenerator->getHappyMessage();
$this->addFlash('success', $message);
// ...
}
When you ask for the MessageGenerator service, the container constructs a new
MessageGenerator object and returns it (see sidebar below). But if you never ask
for the service, it's never constructed: saving memory and speed. As a bonus, the
MessageGenerator service is only created once: the same instance is returned
each time you ask for it.
Automatic Service Loading in services.yaml
The documentation assumes you're using the following service configuration, which is the default config for a new project:
.. configuration-block::
.. code-block:: yaml
# config/services.yaml
services:
# default configuration for services in *this* file
_defaults:
autowire: true # Automatically injects dependencies in your services.
autoconfigure: true # Automatically registers your services as commands, event subscribers, etc.
public: false # Allows optimizing the container by removing unused services; this also means
# fetching services directly from the container via $container->get() won't work.
# The best practice is to be explicit about your dependencies anyway.
# makes classes in src/ available to be used as services
# this creates a service per class whose id is the fully-qualified class name
App\:
resource: '../src/*'
exclude: '../src/{Entity,Migrations,Tests,Kernel.php}'
# ...
.. code-block:: xml
<!-- 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>
<!-- Default configuration for services in *this* file -->
<defaults autowire="true" autoconfigure="true" public="false" />
<prototype namespace="App\" resource="../src/*" exclude="../src/{Entity,Migrations,Tests}" />
</services>
</container>
.. code-block:: php
// config/services.php
use Symfony\Component\DependencyInjection\Definition;
// To use as default template
$definition = new Definition();
$definition
->setAutowired(true)
->setAutoconfigured(true)
->setPublic(false)
;
// $this is a reference to the current loader
$this->registerClasses($definition, 'App\\', '../src/*', '../src/{Entity,Migrations,Tests}');
Tip
The value of the resource and exclude options can be any valid
glob pattern. The value of the exclude option can also be an
array of glob patterns.
.. versionadded:: 4.2
The feature to pass arrays of glob patterns to the ``exclude``
option was introduced in Symfony 4.2.
Thanks to this configuration, you can automatically use any classes from the
src/ directory as a service, without needing to manually configure
it. Later, you'll learn more about this in :ref:`service-psr4-loader`.
If you'd prefer to manually wire your service, that's totally possible: see :ref:`services-explicitly-configure-wire-services`.
What if you need to access the logger service from within MessageGenerator?
No problem! Create a __construct() method with a $logger argument that has
the LoggerInterface type-hint. Set this on a new $logger property
and use it later:
// src/Service/MessageGenerator.php
// ...
use Psr\Log\LoggerInterface;
class MessageGenerator
{
private $logger;
public function __construct(LoggerInterface $logger)
{
$this->logger = $logger;
}
public function getHappyMessage()
{
$this->logger->info('About to find a happy message!');
// ...
}
}
That's it! The container will automatically know to pass the logger service
when instantiating the MessageGenerator. How does it know to do this?
:ref:`Autowiring <services-autowire>`. The key is the LoggerInterface
type-hint in your __construct() method and the autowire: true config in
services.yaml. When you type-hint an argument, the container will automatically
find the matching service. If it can't, you'll see a clear exception with a helpful
suggestion.
By the way, this method of adding dependencies to your __construct() method is
called dependency injection. It's a scary term for a simple concept.
How should you know to use LoggerInterface for the type-hint? You can either
read the docs for whatever feature you're using, or get a list of autowireable
type-hints by running:
$ php bin/console debug:autowiring
This command is your best friend. This is a small subset of the output:
| Class/Interface Type | Alias Service ID |
|---|---|
Psr\Cache\CacheItemPoolInterface |
alias for "cache.app.recorder" |
Psr\Log\LoggerInterface |
alias for "monolog.logger" |
Symfony\Component\EventDispatcher\EventDispatcherInterface |
alias for "debug.event_dispatcher" |
Symfony\Component\HttpFoundation\RequestStack |
alias for "request_stack" |
Symfony\Component\HttpFoundation\Session\SessionInterface |
alias for "session" |
Symfony\Component\Routing\RouterInterface |
alias for "router.default" |
Suppose you also want to email a site administrator each time a site update is made. To do that, you create a new class:
// src/Updates/SiteUpdateManager.php
namespace App\Updates;
use App\Service\MessageGenerator;
class SiteUpdateManager
{
private $messageGenerator;
private $mailer;
public function __construct(MessageGenerator $messageGenerator, \Swift_Mailer $mailer)
{
$this->messageGenerator = $messageGenerator;
$this->mailer = $mailer;
}
public function notifyOfSiteUpdate()
{
$happyMessage = $this->messageGenerator->getHappyMessage();
$message = (new \Swift_Message('Site update just happened!'))
->setFrom('[email protected]')
->setTo('[email protected]')
->addPart(
'Someone just updated the site. We told them: '.$happyMessage
);
return $this->mailer->send($message) > 0;
}
}
This needs the MessageGenerator and the Swift_Mailer service. That's no
problem! In fact, this new service is ready to be used. In a controller, for example,
you can type-hint the new SiteUpdateManager class and use it:
// src/Controller/SiteController.php
// ...
use App\Updates\SiteUpdateManager;
public function new(SiteUpdateManager $siteUpdateManager)
{
// ...
if ($siteUpdateManager->notifyOfSiteUpdate()) {
$this->addFlash('success', 'Notification mail was sent successfully.');
}
// ...
}
Thanks to autowiring and your type-hints in __construct(), the container creates
the SiteUpdateManager object and passes it the correct argument. In most cases,
this works perfectly.
But there are a few cases when an argument to a service cannot be autowired. For example, suppose you want to make the admin email configurable:
// src/Updates/SiteUpdateManager.php
// ...
class SiteUpdateManager
{
// ...
+ private $adminEmail;
- public function __construct(MessageGenerator $messageGenerator, \Swift_Mailer $mailer)
+ public function __construct(MessageGenerator $messageGenerator, \Swift_Mailer $mailer, $adminEmail)
{
// ...
+ $this->adminEmail = $adminEmail;
}
public function notifyOfSiteUpdate()
{
// ...
$message = \Swift_Message::newInstance()
// ...
- ->setTo('[email protected]')
+ ->setTo($this->adminEmail)
// ...
;
// ...
}
}If you make this change and refresh, you'll see an error:
Cannot autowire service "AppUpdatesSiteUpdateManager": argument "$adminEmail" of method "__construct()" must have a type-hint or be given a value explicitly.
That makes sense! There is no way that the container knows what value you want to pass here. No problem! In your configuration, you can explicitly set this argument:
.. configuration-block::
.. code-block:: yaml
# config/services.yaml
services:
# ...
# same as before
App\:
resource: '../src/*'
exclude: '../src/{Entity,Migrations,Tests}'
# explicitly configure the service
App\Updates\SiteUpdateManager:
arguments:
$adminEmail: '[email protected]'
.. code-block:: xml
<!-- config/services.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/services
http://symfony.com/schema/dic/services/services-1.0.xsd">
<services>
<!-- ... -->
<!-- Same as before -->
<prototype namespace="App\" resource="../src/*" exclude="../src/{Entity,Migrations,Tests}" />
<!-- Explicitly configure the service -->
<service id="App\Updates\SiteUpdateManager">
<argument key="$adminEmail">[email protected]</argument>
</service>
</services>
</container>
.. code-block:: php
// config/services.php
use App\Updates\SiteUpdateManager;
use Symfony\Component\DependencyInjection\Definition;
// Same as before
$definition = new Definition();
$definition
->setAutowired(true)
->setAutoconfigured(true)
->setPublic(false)
;
$this->registerClasses($definition, 'App\\', '../src/*', '../src/{Entity,Migrations,Tests}');
// Explicitly configure the service
$container->getDefinition(SiteUpdateManager::class)
->setArgument('$adminEmail', '[email protected]');
Thanks to this, the container will pass [email protected] to the $adminEmail
argument of __construct when creating the SiteUpdateManager service. The
other arguments will still be autowired.
But, isn't this fragile? Fortunately, no! If you rename the $adminEmail argument
to something else - e.g. $mainEmail - you will get a clear exception when you
reload the next page (even if that page doesn't use this service).
In addition to holding service objects, the container also holds configuration,
called parameters. To create a parameter, add it under the parameters key
and reference it with the %parameter_name% syntax:
.. configuration-block::
.. code-block:: yaml
# config/services.yaml
parameters:
admin_email: [email protected]
services:
# ...
App\Updates\SiteUpdateManager:
arguments:
$adminEmail: '%admin_email%'
.. code-block:: xml
<!-- config/services.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/services
http://symfony.com/schema/dic/services/services-1.0.xsd">
<parameters>
<parameter key="admin_email">[email protected]</parameter>
</parameters>
<services>
<!-- ... -->
<service id="App\Updates\SiteUpdateManager">
<argument key="$adminEmail">%admin_email%</argument>
</service>
</services>
</container>
.. code-block:: php
// config/services.php
use App\Updates\SiteUpdateManager;
$container->setParameter('admin_email', '[email protected]');
$container->autowire(SiteUpdateManager::class)
// ...
->setArgument('$adminEmail', '%admin_email%');
Actually, once you define a parameter, it can be referenced via the
%parameter_name% syntax in any other configuration file. Many parameters
are defined in the config/services.yaml file.
You can then fetch the parameter in the service:
class SiteUpdateManager
{
// ...
private $adminEmail;
public function __construct($adminEmail)
{
$this->adminEmail = $adminEmail;
}
}
You can also fetch parameters directly from the container:
public function new()
{
// ...
// this ONLY works if you extend the base Controller
$adminEmail = $this->container->getParameter('admin_email');
// or a shorter way!
// $adminEmail = $this->getParameter('admin_email');
}
For more info about parameters, see :doc:`/service_container/parameters`.
The MessageGenerator service created earlier requires a LoggerInterface argument:
// src/Service/MessageGenerator.php
// ...
use Psr\Log\LoggerInterface;
class MessageGenerator
{
private $logger;
public function __construct(LoggerInterface $logger)
{
$this->logger = $logger;
}
// ...
}
However, there are multiple services in the container that implement LoggerInterface,
such as logger, monolog.logger.request, monolog.logger.php, etc. How
does the container know which one to use?
In these situations, the container is usually configured to automatically choose
one of the services - logger in this case (read more about why in :ref:`service-autowiring-alias`).
But, you can control this and pass in a different logger:
.. configuration-block::
.. code-block:: yaml
# config/services.yaml
services:
# ... same code as before
# explicitly configure the service
App\Service\MessageGenerator:
arguments:
# the '@' symbol is important: that's what tells the container
# you want to pass the *service* whose id is 'monolog.logger.request',
# and not just the *string* 'monolog.logger.request'
$logger: '@monolog.logger.request'
.. code-block:: xml
<!-- config/services.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/services
http://symfony.com/schema/dic/services/services-1.0.xsd">
<services>
<!-- ... same code as before -->
<!-- Explicitly configure the service -->
<service id="App\Service\MessageGenerator">
<argument key="$logger" type="service" id="monolog.logger.request" />
</service>
</services>
</container>
.. code-block:: php
// config/services.php
use App\Service\MessageGenerator;
use Symfony\Component\DependencyInjection\Reference;
$container->autowire(MessageGenerator::class)
->setAutoconfigured(true)
->setPublic(false)
->setArgument('$logger', new Reference('monolog.logger.request'));
This tells the container that the $logger argument to __construct should use
service whose id is monolog.logger.request.
For a full list of all possible services in the container, run:
$ php bin/console debug:container
You can also use the bind keyword to bind specific arguments by name or type:
.. configuration-block::
.. code-block:: yaml
# config/services.yaml
services:
_defaults:
bind:
# pass this value to any $adminEmail argument for any service
# that's defined in this file (including controller arguments)
$adminEmail: '[email protected]'
# pass this service to any $requestLogger argument for any
# service that's defined in this file
$requestLogger: '@monolog.logger.request'
# pass this service for any LoggerInterface type-hint for any
# service that's defined in this file
Psr\Log\LoggerInterface: '@monolog.logger.request'
# optionally you can define both the name and type of the argument to match
string $adminEmail: '[email protected]'
Psr\Log\LoggerInterface $requestLogger: '@monolog.logger.request'
# ...
.. code-block:: xml
<!-- config/services.xml -->
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/services
http://symfony.com/schema/dic/services/services-1.0.xsd">
<services>
<defaults autowire="true" autoconfigure="true" public="false">
<bind key="$adminEmail">[email protected]</bind>
<bind key="$requestLogger"
type="service"
id="monolog.logger.request"
/>
<bind key="Psr\Log\LoggerInterface"
type="service"
id="monolog.logger.request"
/>
<!-- optionally you can define both the name and type of the argument to match -->
<bind key="string $adminEmail">[email protected]</bind>
<bind key="Psr\Log\LoggerInterface $requestLogger"
type="service"
id="monolog.logger.request"
/>
</defaults>
<!-- ... -->
</services>
</container>
.. code-block:: php
// config/services.php
use App\Controller\LuckyController;
use Symfony\Component\DependencyInjection\Reference;
use Psr\Log\LoggerInterface;
$container->register(LuckyController::class)
->setPublic(true)
->setBindings(array(
'$adminEmail' => '[email protected]',
'$requestLogger' => new Reference('monolog.logger.request'),
LoggerInterface::class => new Reference('monolog.logger.request'),
// optionally you can define both the name and type of the argument to match
'string $adminEmail' => '[email protected]',
LoggerInterface::class.' $requestLogger' => new Reference('monolog.logger.request'),
))
;
By putting the bind key under _defaults, you can specify the value of any
argument for any service defined in this file! You can bind arguments by name
(e.g. $adminEmail), by type (e.g. Psr\Log\LoggerInterface) or both
(e.g. Psr\Log\LoggerInterface $requestLogger).
.. versionadded:: 4.2
The feature to bind arguments by name and type was introduced in Symfony 4.2.
The bind config can also be applied to specific services or when loading many
services at once (i.e. :ref:`service-psr4-loader`).
.. versionadded:: 4.1
The feature to get container parameters as a service was introduced in Symfony 4.1.
If some service or controller needs lots of container parameters, there's an
easier alternative to binding all of them with the services._defaults.bind
option. Type-hint any of its constructor arguments with the
:class:`Symfony\\Component\\DependencyInjection\\ParameterBag\\ParameterBagInterface`
or the new :class:`Symfony\\Component\\DependencyInjection\\ParameterBag\\ContainerBagInterface`
and the service will get all container parameters in a
:class:`Symfony\\Component\\DependencyInjection\\ParameterBag\\ParameterBag` object:
// src/Service/MessageGenerator.php
// ...
use Symfony\Component\DependencyInjection\ParameterBag\ParameterBagInterface;
class MessageGenerator
{
private $params;
public function __construct(ParameterBagInterface $params)
{
$this->params = $params;
}
public function someMethod()
{
// get any param from $this->params, which stores all container parameters
$sender = $this->params->get('mailer_sender');
// ...
}
}
Above, the services.yaml file has autowire: true in the _defaults section
so that it applies to all services defined in that file. With this setting, you're
able to type-hint arguments in the __construct() method of your services and
the container will automatically pass you the correct arguments. This entire entry
has been written around autowiring.
For more details about autowiring, check out :doc:`/service_container/autowiring`.
Above, the services.yaml file has autoconfigure: true in the _defaults
section so that it applies to all services defined in that file. With this setting,
the container will automatically apply certain configuration to your services, based
on your service's class. This is mostly used to auto-tag your services.
For example, to create a Twig extension, you need to create a class, register it
as a service, and :doc:`tag </service_container/tags>` it with twig.extension.
But, with autoconfigure: true, you don't need the tag. In fact, if you're using
the :ref:`default services.yaml config <service-container-services-load-example>`,
you don't need to do anything: the service will be automatically loaded. Then,
autoconfigure will add the twig.extension tag for you, because your class
implements Twig\Extension\ExtensionInterface. And thanks to autowire, you can even add
constructor arguments without any configuration.
Thanks to the _defaults section in services.yaml, every service defined in
this file is public: false by default.
What does this mean? When a service is public, you can access it directly
from the container object, which is accessible from any controller that extends
Controller:
use App\Service\MessageGenerator;
// ...
public function new()
{
// there IS a public "logger" service in the container
$logger = $this->container->get('logger');
// this will NOT work: MessageGenerator is a private service
$generator = $this->container->get(MessageGenerator::class);
}
As a best practice, you should only create private services, which will happen
automatically. And also, you should not use the $container->get() method to
fetch public services.
But, if you do need to make a service public, override the public setting:
.. configuration-block::
.. code-block:: yaml
# config/services.yaml
services:
# ... same code as before
# explicitly configure the service
App\Service\MessageGenerator:
public: true
.. code-block:: xml
<!-- 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>
<!-- ... same code as before -->
<!-- Explicitly configure the service -->
<service id="App\Service\MessageGenerator" public="true"></service>
</services>
</container>
You've already seen that you can import many services at once by using the resource
key. For example, the default Symfony configuration contains this:
.. configuration-block::
.. code-block:: yaml
# config/services.yaml
services:
# ...
# makes classes in src/ available to be used as services
# this creates a service per class whose id is the fully-qualified class name
App\:
resource: '../src/*'
exclude: '../src/{Entity,Migrations,Tests}'
.. code-block:: xml
<!-- 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>
<!-- ... -->
<prototype namespace="App\" resource="../src/*" exclude="../src/{Entity,Migrations,Tests}" />
</services>
</container>
.. code-block:: php
// config/services.php
use Symfony\Component\DependencyInjection\Definition;
// To use as default template
$definition = new Definition();
$definition
->setAutowired(true)
->setAutoconfigured(true)
->setPublic(false)
;
$this->registerClasses($definition, 'App\\', '../src/*', '../src/{Entity,Migrations,Tests}');
Tip
The value of the resource and exclude options can be any valid
glob pattern.
This can be used to quickly make many classes available as services and apply some
default configuration. The id of each service is its fully-qualified class name.
You can override any service that's imported by using its id (class name) below
(e.g. see :ref:`services-manually-wire-args`). If you override a service, none of
the options (e.g. public) are inherited from the import (but the overridden
service does still inherit from _defaults).
You can also exclude certain paths. This is optional, but will slightly increase
performance in the dev environment: excluded paths are not tracked and so modifying
them will not cause the container to be rebuilt.
Note
Wait, does this mean that every class in src/ is registered as
a service? Even model classes? Actually, no. As long as you have
public: false under your _defaults key (or you can add it under the
specific import), all the imported services are private. Thanks to this, all
classes in src/ that are not explicitly used as services are
automatically removed from the final container. In reality, the import
means that all classes are "available to be used as services" without needing
to be manually configured.
If you define services using the YAML config format, the PHP namespace is used as the key of each configuration, so you can't define different service configs for classes under the same namespace:
# config/services.yaml
services:
App\Domain\:
resource: '../src/Domain/*'
# ...In order to have multiple definitions, add the namespace option and use any
unique string as the key of each service config:
# config/services.yaml
services:
command_handlers:
namespace: App\Domain\
resource: '../src/Domain/*/CommandHandler'
tags: [command_handler]
event_subscribers:
namespace: App\Domain\
resource: '../src/Domain/*/EventSubscriber'
tags: [event_subscriber]Prior to Symfony 3.3, all services and (typically) arguments were explicitly configured: it was not possible to :ref:`load services automatically <service-container-services-load-example>` and :ref:`autowiring <services-autowire>` was much less common.
Both of these features are optional. And even if you use them, there may be some
cases where you want to manually wire a service. For example, suppose that you want
to register 2 services for the SiteUpdateManager class - each with a different
admin email. In this case, each needs to have a unique service id:
.. configuration-block::
.. code-block:: yaml
# config/services.yaml
services:
# ...
# this is the service's id
site_update_manager.superadmin:
class: App\Updates\SiteUpdateManager
# you CAN still use autowiring: we just want to show what it looks like without
autowire: false
# manually wire all arguments
arguments:
- '@App\Service\MessageGenerator'
- '@mailer'
- '[email protected]'
site_update_manager.normal_users:
class: App\Updates\SiteUpdateManager
autowire: false
arguments:
- '@App\Service\MessageGenerator'
- '@mailer'
- '[email protected]'
# Create an alias, so that - by default - if you type-hint SiteUpdateManager,
# the site_update_manager.superadmin will be used
App\Updates\SiteUpdateManager: '@site_update_manager.superadmin'
.. code-block:: xml
<!-- 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="site_update_manager.superadmin" class="App\Updates\SiteUpdateManager" autowire="false">
<argument type="service" id="App\Service\MessageGenerator" />
<argument type="service" id="mailer" />
<argument>[email protected]</argument>
</service>
<service id="site_update_manager.normal_users" class="App\Updates\SiteUpdateManager" autowire="false">
<argument type="service" id="App\Service\MessageGenerator" />
<argument type="service" id="mailer" />
<argument>[email protected]</argument>
</service>
<service id="App\Updates\SiteUpdateManager" alias="site_update_manager.superadmin" />
</services>
</container>
.. code-block:: php
// config/services.php
use App\Updates\SiteUpdateManager;
use App\Service\MessageGenerator;
use Symfony\Component\DependencyInjection\Reference;
$container->register('site_update_manager.superadmin', SiteUpdateManager::class)
->setAutowired(false)
->setArguments(array(
new Reference(MessageGenerator::class),
new Reference('mailer'),
'[email protected]'
));
$container->register('site_update_manager.normal_users', SiteUpdateManager::class)
->setAutowired(false)
->setArguments(array(
new Reference(MessageGenerator::class),
new Reference('mailer'),
'[email protected]'
));
$container->setAlias(SiteUpdateManager::class, 'site_update_manager.superadmin')
In this case, two services are registered: site_update_manager.superadmin
and site_update_manager.normal_users. Thanks to the alias, if you type-hint
SiteUpdateManager the first (site_update_manager.superadmin) will be passed.
If you want to pass the second, you'll need to :ref:`manually wire the service <services-wire-specific-service>`.
Caution!
If you do not create the alias and are :ref:`loading all services from src/ <service-container-services-load-example>`,
then three services have been created (the automatic service + your two services)
and the automatically loaded service will be passed - by default - when you type-hint
SiteUpdateManager. That's why creating the alias is a good idea.
.. toctree::
:maxdepth: 1
:glob:
/service_container/*