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Commit 680b429

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Modernise resolve_target_entities documentation
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‎doctrine/resolve_target_entity.rst

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How to Define Relationships with Abstract Classes and Interfaces
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================================================================
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Referencing Entities with Abstract Classes and Interfaces
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=========================================================
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One of the goals of bundles is to create discrete bundles of functionality
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that do not have many (if any) dependencies, allowing you to use that
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functionality in other applications without including unnecessary items.
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In applications where functionality is segregated with minimal concrete dependencies
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between the various layers, such as monoliths which are split into multiple modules,
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it might be hard to prevent hard dependencies on entities between modules.
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Doctrine 2.2 includes a new utility called the ``ResolveTargetEntityListener``,
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that functions by intercepting certain calls inside Doctrine and rewriting
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``targetEntity`` parameters in your metadata mapping at runtime. It means that
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in your bundle you are able to use an interface or abstract class in your
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mappings and expect correct mapping to a concrete entity at runtime.
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you are able to use an interface or abstract class in your mappings and expect
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correct mapping to a concrete entity at runtime.
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This functionality allows you to define relationships between different entities
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without making them hard dependencies.
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Background
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----------
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Suppose you have an InvoiceBundle which provides invoicing functionality
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and a CustomerBundle that contains customer management tools. You want
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to keep these separated, because they can be used in other systems without
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each other, but for your application you want to use them together.
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Suppose you have an application which provides two modules; an Invoice module which
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provides invoicing functionality, and a Customer module that contains customer management
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tools. You want to keep dependencies between these modules separated, because they should
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not be aware of the other module's implementation details.
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In this case, you have an ``Invoice`` entity with a relationship to a
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non-existent object, an ``InvoiceSubjectInterface``. The goal is to get
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the ``ResolveTargetEntityListener`` to replace any mention of the interface
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In this case, you have an ``Invoice`` entity with a relationship to the interface
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``InvoiceSubjectInterface``. This is not recognized as a valid entity by Doctrine.
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The goal is to get the ``ResolveTargetEntityListener`` to replace any mention of the interface
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with a real object that implements that interface.
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Set up
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public function getName(): string;
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}
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Next, you need to configure the listener, which tells the DoctrineBundle
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Next, you need to configure the ``resolve_target_entities`` option, which tells the DoctrineBundle
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about the replacement:
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.. configuration-block::
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--------------
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With the ``ResolveTargetEntityListener``, you are able to decouple your
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bundles, keeping them usable by themselves, but still being able to
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modules, keeping them usable by themselves, but still being able to
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define relationships between different objects. By using this method,
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your bundles will end up being easier to maintain independently.
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your modules will end up being easier to maintain independently.

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