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Commit2b58adb

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feature#16516 Add documentation for using expressions as service factories (jvasseur)
This PR was merged into the 6.1 branch.Discussion----------Add documentation for using expressions as service factoriesDoc PR forsymfony/symfony#45512Commits-------f8fc3d6 Add documentation for using expressions as service factories
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‎service_container/expression_language.rst‎

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@@ -131,3 +131,54 @@ via a ``container`` variable. Here's another example:
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Expressions can be used in ``arguments``, ``properties``, as arguments with
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``configurator`` and as arguments to ``calls`` (method calls).
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You can also use expressions as service factories:
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..configuration-block::
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..code-block::yaml
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# config/services.yaml
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services:
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App\Mailer:
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factory:"@=parameter('some_param') ? service('some_service') : arg(0)"
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arguments:
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-'@some_other_service'
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..code-block::xml
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<!-- config/services.xml-->
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<?xml version="1.0" encoding="UTF-8" ?>
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<containerxmlns="http://symfony.com/schema/dic/services"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://symfony.com/schema/dic/services
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https://symfony.com/schema/dic/services/services-1.0.xsd">
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<services>
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<serviceid="App\Mailer">
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<factoryexpression="parameter('some_param') ? service('some_service') : arg(0)"/>
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<argumenttype="service"id="some_other_service"/>
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</service>
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</services>
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</container>
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..code-block::php
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// config/services.php
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namespace Symfony\Component\DependencyInjection\Loader\Configurator;
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use App\Mailer;
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return function(ContainerConfigurator $configurator) {
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$services = $configurator->services();
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$services->set(Mailer::class)
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->factory(expr("parameter('some_param') ? service('some_service') : arg(0)"))
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->args([service('some_other_service')]);
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};
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In this context, you have access to the ``arg`` function that allows getting the value of arguments passed to the factory.
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..versionadded::6.1
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Using expressions as factories was introduced in Symfony 6.1.

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