New in Symfony 6.4: Class-based Serializer Contexts

Contributed by
Mathias Arlaud

in #51476.

The serializer context controls the serialization and deserialization of
resources. This context is passed to all normalizers and can be used for example
to set the date/time format, how to represent empty objects and arrays, etc.

In Symfony you can define that context in multiple ways: as a PHP array passed to
serialize() and deserialize() methods, as a framework.serializer.default_context
global configuration option and via the #[Context] attribute on class properties.

In Symfony 6.4 we’re introducing a new way of setting the serializer context:
using the #[Context] attribute on the class itself:

namespace AppModel;

use SymfonyComponentSerializerAnnotationContext;
use SymfonyComponentSerializerNormalizerDateTimeNormalizer;

#[Context([DateTimeNormalizer::FORMAT_KEY => DateTime::RFC3339])]
#[Context(
context: [DateTimeNormalizer::FORMAT_KEY => DateTime::RFC3339_EXTENDED],
groups: [‚extended‘],
)]
class Person
{
// …
}

The class-based #[Context] attribute is applied to all properties of the class,
which can override that configuration with their own #[Context] attributes.
This new feature will improve DX (developer experience) when working with the
Serializer component and will make you more productive by avoiding repetition.

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