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Commit905c0a4

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Merge branch '2.8' into 3.4
* 2.8: Improved the section about overriding bundle services Added a caution note about race conditions in EntityType
2 parentsca35570 +03a8055 commit905c0a4

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‎bundles/override.rst‎

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Services & Configuration
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------------------------
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If you want to modify service definitions of another bundle, you can use a compiler
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pass to change the class of the service or to modify method calls. In the following
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example, the implementing class for the ``original-service-id`` is changed to
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``Acme\DemoBundle\YourService``::
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// src/Acme/DemoBundle/DependencyInjection/Compiler/OverrideServiceCompilerPass.php
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namespace Acme\DemoBundle\DependencyInjection\Compiler;
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use Acme\DemoBundle\YourService;
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use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
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use Symfony\Component\DependencyInjection\ContainerBuilder;
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class OverrideServiceCompilerPass implements CompilerPassInterface
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{
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public function process(ContainerBuilder $container)
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{
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$definition = $container->getDefinition('original-service-id');
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$definition->setClass(YourService::class);
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}
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}
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For more information on compiler passes, see:doc:`/service_container/compiler_passes`.
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If you want to modify the services created by a bundle, you can use
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:doc:`service decoration</service_container/service_decoration>`.
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If you want to do more advanced manipulations, like removing services created by
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other bundles, you must work with:doc:`service definitions</service_container/definitions>`
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inside a:doc:`compiler pass</service_container/compiler_passes>`.
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Entities & Entity Mapping
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-------------------------

‎reference/constraints/UniqueEntity.rst‎

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}
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}
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..caution::
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This constraint doesn't provide any protection against `race conditions`_.
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They may occur when another entity is persisted by an external process after
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this validation has passed and before this entity is actually persisted in
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the database.
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Options
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-------
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also has a ``null`` value, validation would fail.
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..include::/reference/constraints/_payload-option.rst.inc
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.. _`race conditions`:https://en.wikipedia.org/wiki/Race_condition

‎service_container/compiler_passes.rst‎

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How to Work with Compiler Passes in Bundles
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===========================================
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Compiler passes give you an opportunity to manipulate other service
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definitions that have been registered with the service container. You
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can read about how to create them in the components section
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":ref:`components-di-separate-compiler-passes`".
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Compiler passes give you an opportunity to manipulate other
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:doc:`servicedefinitions</service_container/definitions>`that have been
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registered with the service container. Youcan read about how to create them in
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the components section":ref:`components-di-separate-compiler-passes`".
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When using:ref:`separate compiler passes<components-di-separate-compiler-passes>`,
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you need to register them in the ``build()`` method of the bundle class (this
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}
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}
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One of the most common use-cases of compiler passes is to work with tagged services
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(read more about tags in":doc:`/service_container/tags`"). If you are using
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One of the most common use-cases of compiler passes is to work with
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":doc:`service tags</service_container/tags>`". If you are using
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custom tags in a bundle then by convention, tag names consist of the name of
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the bundle (lowercase, underscores as separators), followed by a dot, and
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finally the "real" name. For example, if you want to introduce some sort of

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