Api Platform Conference

The conference dedicated to API Platform and its ecosystem

Sep 15, 16 2022 | Lille & online

Extending JSON-LD AND Hydra Contexts

JSON-LD

JSON-LD screencast
Watch the JSON-LD screencast

API Platform Core 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\Core\Annotation\ApiProperty;
use ApiPlatform\Core\Annotation\ApiResource;

#[ApiResource(iri: "http://schema.org/Book")]
class Book
{
    // ...

    #[ApiProperty(
      iri: "http://schema.org/name",
      attributes: [
        "jsonld_context" => [
          "@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

Hydra screencast
Watch the Hydra screencast

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

<?php
// api/src/Entity/Book.php

use ApiPlatform\Core\Annotation\ApiResource;

#[ApiResource(itemOperations: [
  "get" => ["hydra_context" => ["foo" => "bar"]]
])]
class Book
{
    //...
}

What' new?

API platform conference 2022

Sep 15,16 2022: new edition of our conference dedicated to API Platform and its ecosystem!