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Commit33262be

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minor#9948 Document the required ClassMetadataFactory (deviantintegral, javiereguiluz)
This PR was submitted for the master branch but it was merged into the 3.4 branch instead (closes#9948).Discussion----------Document the required ClassMetadataFactorySymfony PR atsymfony/symfony#26534Commits-------bc011c0 Rewordb05c1cc Codefence ClassMetadataFactorya4cb67a Document the required ClassMetadataFactory
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‎components/serializer.rst‎

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@@ -169,10 +169,11 @@ needs three parameters:
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Support for the ``allow_extra_attributes`` key in the context was introduced
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in Symfony 3.3.
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By default, additional attributes that are not mapped to the denormalized
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object will be ignored by the Serializer component. Set the ``allow_extra_attributes``
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key of the deserialization context to ``false`` to let the serializer throw
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an exception when additional attributes are passed::
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By default, additional attributes that are not mapped to the denormalized object
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will be ignored by the Serializer component. If you prefer to throw an exception
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when this happens, set the ``allow_extra_attributes`` context option to
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``false`` and provide an object that implements ``ClassMetadataFactoryInterface`
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when constructing the normalizer::
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$data = <<<EOF
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<person>
@@ -184,6 +185,9 @@ an exception when additional attributes are passed::
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// this will throw a Symfony\Component\Serializer\Exception\ExtraAttributesException
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// because "city" is not an attribute of the Person class
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$classMetadataFactory = new ClassMetadataFactory(new AnnotationLoader(new AnnotationReader()));
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$normalizer = new ObjectNormalizer($classMetadataFactory);
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$serializer = new Serializer(array($normalizer));
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$person = $serializer->deserialize($data, 'Acme\Person', 'xml', array(
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'allow_extra_attributes' => false,
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));

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