# Extending JSON-LD AND Hydra Contexts

# JSON-LD

API Platform provides the possibility to extend the JSON-LD context of properties. This allows you to describe JSON-LD-typed values, inverse properties using the @reverse keyword and you can even overwrite the @id property this way. Everything you define within the following annotation will be passed to the context. This provides a generic way to extend the context.

<?php
// api/src/Entity/Book.php
namespace App\Entity;

use ApiPlatform\Metadata\ApiProperty;
use ApiPlatform\Metadata\ApiResource;

#[ApiResource(types: ['https://schema.org/Book'])]
class Book
{
    // ...

    #[ApiProperty(
        types: ['https://schema.org/name'],
        jsonldContext: [
            '@id' => 'http://yourcustomid.com',
            '@type' => 'http://www.w3.org/2001/XMLSchema#string',
            'someProperty' => [
                'a' => 'textA',
                'b' => 'textB'
            ]
        ]
    )]
    public $name;
    
    // ...
}

The generated context will now have your custom attributes set:

GET /contexts/Book

{
  "@context": {
    "@vocab": "http://example.com/apidoc#",
    "hydra": "http://www.w3.org/ns/hydra/core#",
    "name": {
      "@id": "http://yourcustomid.com",
      "@type": "http://www.w3.org/2001/XMLSchema#string",
      "someProperty": {
        "a": "textA",
        "b": "textB"
      }
    }
  }
}

Note that you do not have to provide the @id attribute. If you do not provide an @id attribute, the value from iri will be used.

# Hydra

Watch the Hydra screencast

It’s also possible to replace the Hydra context used by the documentation generator:

<?php
// api/src/Entity/Book.php
namespace App\Entity;

use ApiPlatform\Metadata\ApiResource;
use ApiPlatform\Metadata\Get;

#[ApiResource(operations: [
  new Get(hydraContext: ['foo' => 'bar'])
])]
class Book
{
    //...
}

# api/config/api_platform/resources.yaml
resources:
    App\Entity\Book:
        operations:
            ApiPlatform\Metadata\Get:
                hydraContext: { foo: 'bar' }

<?xml version="1.0" encoding="UTF-8" ?>
<!-- api/config/api_platform/resources.xml -->

<resources xmlns="https://api-platform.com/schema/metadata/resources-3.0"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
           xsi:schemaLocation="https://api-platform.com/schema/metadata/resources-3.0
           https://api-platform.com/schema/metadata/resources-3.0.xsd">
    <resource class="App\Entity\Book">
        <operations>
            <operation class="ApiPlatform\Metadata\Get">              
                <hydraContext>
                    <values>
                        <value name="foo">bar</value>
                    </values>
                </hydraContext>
            </operation>
        </operations>
    </resource>
</resources>

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# Extending JSON-LD AND Hydra Contexts

# JSON-LD

# Hydra