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Commitda531f3

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minor#18804 [Form] AddedAbstractChoiceLoader (alexandre-daubois)
This PR was merged into the 5.4 branch.Discussion----------[Form] Added `AbstractChoiceLoader`Fix#13120If this [one's closed](#12826 (comment)), then this is the last one of the 5.1 milestone 😄Commits-------37c4df7 [Form] Added `AbstractChoiceLoader`
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‎reference/forms/types/options/choice_loader.rst.inc

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@@ -26,6 +26,22 @@ This will cause the call of ``StaticClass::getConstants()`` to not happen if the
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request is redirected and if there is no pre set or submitted data. Otherwise
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the choice options would need to be resolved thus triggering the callback.
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If the ``CallbackChoiceLoader`` doesn't fit your needs and you want to create
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your own loader, you can either create a loader by implementing the
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:class:`Symfony\\Component\\Form\\ChoiceList\\Loader\\ChoiceLoaderInterface`
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or by extending the
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:class:`Symfony\\Component\\Form\\ChoiceList\\Loader\\AbstractChoiceLoader`.
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This abstract class allows to save some boilerplate by implementing some
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of the :class:`Symfony\\Component\\Form\\ChoiceList\\Loader\\ChoiceLoaderInterface`
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methods. Thus, you'll only have to implement the
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:method:`Symfony\\Component\\Form\\ChoiceList\\Loader\\AbstractChoiceLoader::loadChoices`
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method to have a fully functional choice loader.
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.. versionadded:: 5.1
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The :class:`Symfony\\Component\\Form\\ChoiceList\\Loader\\AbstractChoiceLoader`
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class was introduced in Symfony 5.1.
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When you're defining a custom choice type that may be reused in many fields
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(like entries of a collection) or reused in multiple forms at once, you
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should use the :class:`Symfony\\Component\\Form\\ChoiceList\\ChoiceList`

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