Symfony JSON-API Transformer Bundle

For Symfony 2 and Symfony 3

• Installation
• Usage
  • Creating the mappings
• Outputing API Responses
  • JSON API Requests
  • JSON API Responses
• Integration with NelmioApiDocBundleBundle
• Quality
• Contribute
• Support
• Authors
• License

Installation

Step 1: Download the Bundle

Open a command console, enter your project directory and execute the following command to download the latest stable version of this bundle:

$ composer require nilportugues/jsonapi-bundle

Step 2: Enable the Bundle

Then, enable the bundle by adding it to the list of registered bundles in the app/AppKernel.php file of your project:

<?php
// app/AppKernel.php
// ...
class AppKernel extends Kernel
{
    public function registerBundles()
    {
        $bundles = array(
            // ...
            new NilPortugues\Symfony\JsonApiBundle\NilPortuguesSymfonyJsonApiBundle(),
        );
        // ...
    }
    // ...
}

Usage

Creating the mappings

Mapping directory

Mapping files should be located at the app/config/serializer directory. This directory must be created.

It can be also be customized and placed elsewhere by editing the app/config/config.yml configuration file:

# app/config/config.yml

nilportugues_json_api:
    mappings: 
        - "%kernel.root_dir%/config/serializer/"
        - @AppBundle/Product/config/Mappings

Mapping files

The JSON-API transformer works by transforming an existing PHP object into its JSON representation. For each object, a mapping file is required.

Mapping files must be placed in the mappings directory. The expected mapping file format is .yml and will allow you to rename, hide and create links relating all of your data.

For instance, here's a quite complex Post object to demonstrate how it works:

$post = new Post(
    new PostId(9),
    'Hello World',
    'Your first post',
    new User(
        new UserId(1),
        'Post Author'
    ),
    [
        new Comment(
            new CommentId(1000),
            'Have no fear, sers, your king is safe.',
            new User(new UserId(2), 'Barristan Selmy'),
            [
                'created_at' => (new DateTime('2015/07/18 12:13:00'))->format('c'),
                'accepted_at' => (new DateTime('2015/07/19 00:00:00'))->format('c'),
            ]
        ),
    ]
);

And the series of mapping files required:

# app/config/serializer/acme_domain_dummy_post.yml

mapping:
  class: Acme\Domain\Dummy\Post
  alias: Message
  aliased_properties:
    author: author
    title: headline
    content: body
  hide_properties: []
  id_properties:
    - postId
  urls:
    self: get_post ## @Route name
    comments: get_post_comments ## @Route name
  relationships:
    author:
      related: get_post_author ## @Route name
      self: get_post_author_relationship  ## @Route name

# app/config/serializer/acme_domain_dummy_value_object_post_id.yml

mapping:
  class: Acme\Domain\Dummy\ValueObject\PostId
  aliased_properties: []
  hide_properties: []
  id_properties:
  - postId
  urls:
    self: get_post  ## @Route name
  relationships:
    comment:
      self: get_post_comments_relationship  ## @Route name

# app/config/serializer/acme_domain_dummy_comment.yml

mapping:
  class: Acme\Domain\Dummy\Comment
  aliased_properties: []
  hide_properties: []
  id_properties:
    - commentId
  urls:
    self: get_comment ## @Route name
  relationships:
    post:
      self: get_post_comments_relationship ## @Route name

# app/config/serializer/acme_domain_dummy_value_object_comment_id.yml

mapping:
  class: Acme\Domain\Dummy\ValueObject\CommentId
  aliased_properties: []
  hide_properties: []
  id_properties:
    - commentId
  urls:
    self: get_comment ## @Route name
  relationships:
    post:
      self: get_post_comments_relationship ## @Route name

# app/config/serializer/acme_domain_dummy_user.yml

mapping:
  class: Acme\Domain\Dummy\User
  aliased_properties: []
  hide_properties: []
  id_properties:
  - userId
  urls:
    self: get_user
    friends: get_user_friends  ## @Route name
    comments: get_user_comments  ## @Route name

# app/config/serializer/acme_domain_dummy_value_object_user_id.yml

mapping:
  class: Acme\Domain\Dummy\ValueObject\UserId
  aliased_properties: []
  hide_properties: []
  id_properties:
  - userId
  urls:
    self: get_user  ## @Route name
    friends: get_user_friends  ## @Route name
    comments: get_user_comments  ## @Route name

Outputing API Responses

It is really easy, just get an instance of the JsonApiSerializer from the Service Container and pass the object to its serialize() method. Output will be valid JSON-API.

Here's an example of a Post object being fetched from a Doctrine repository.

Finally, a helper trait, JsonApiResponseTrait is provided to write fully compilant responses wrapping the PSR-7 Response objects provided by the original JSON API Transformer library.

<?php
namespace AppBundle\Controller;

use NilPortugues\Symfony\JsonApiBundle\Serializer\JsonApiResponseTrait;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class PostController extends Controller
{
    use JsonApiResponseTrait;

    /**
     * @\Symfony\Component\Routing\Annotation\Route("/post/{postId}", name="get_post")
     *
     * @param $postId
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function getPostAction($postId)
    {
        $post = $this->get('doctrine.post_repository')->find($postId);
        
        $serializer = $this->get('nil_portugues.serializer.json_api_serializer');

        /** @var \NilPortugues\Api\JsonApi\JsonApiTransformer $transformer */
        $transformer = $serializer->getTransformer();
        $transformer->setSelfUrl($this->generateUrl('get_post', ['postId' => $postId], true));
        $transformer->setNextUrl($this->generateUrl('get_post', ['postId' => $postId+1], true));

        return $this->response($serializer->serialize($post));
    }
} 

Output:

HTTP/1.1 200 OK
Cache-Control: private, max-age=0, must-revalidate
Content-type: application/vnd.api+json

{
    "data": {
        "type": "message",
        "id": "9",
        "attributes": {
            "headline": "Hello World",
            "body": "Your first post"
        },
        "links": {
            "self": {
                "href": "http://example.com/posts/9"
            },
            "comments": {
                "href": "http://example.com/posts/9/comments"
            }
        },
        "relationships": {
            "author": {
                "links": {
                    "self": {
                        "href": "http://example.com/posts/9/relationships/author"
                    },
                    "related": {
                        "href": "http://example.com/posts/9/author"
                    }
                },
                "data": {
                    "type": "user",
                    "id": "1"
                }
            }
        }
    },
    "included": [
        {
            "type": "user",
            "id": "1",
            "attributes": {
                "name": "Post Author"
            },
            "links": {
                "self": {
                    "href": "http://example.com/users/1"
                },
                "friends": {
                    "href": "http://example.com/users/1/friends"
                },
                "comments": {
                    "href": "http://example.com/users/1/comments"
                }
            }
        },
        {
            "type": "user",
            "id": "2",
            "attributes": {
                "name": "Barristan Selmy"
            },
            "links": {
                "self": {
                    "href": "http://example.com/users/2"
                },
                "friends": {
                    "href": "http://example.com/users/2/friends"
                },
                "comments": {
                    "href": "http://example.com/users/2/comments"
                }
            }
        },
        {
            "type": "comment",
            "id": "1000",
            "attributes": {
                "dates": {
                    "created_at": "2015-08-13T21:11:07+02:00",
                    "accepted_at": "2015-08-13T21:46:07+02:00"
                },
                "comment": "Have no fear, sers, your king is safe."
            },
            "relationships": {
                "user": {
                    "data": {
                        "type": "user",
                        "id": "2"
                    }
                }
            },            
            "links": {
                "self": {
                    "href": "http://example.com/comments/1000"
                }
            }
        }
    ],
    "links": {
        "self": {
            "href": "http://example.com/posts/9"
        },
        "next": {
            "href": "http://example.com/posts/10"
        }
    },
    "jsonapi": {
        "version": "1.0"
    }
}

Request objects

JSON API comes with a helper Request class, NilPortugues\Api\JsonApi\Http\Request\Request(ServerRequestInterface $request), implementing the PSR-7 Request Interface. Using this request object will provide you access to all the interactions expected in a JSON API:

JSON API Query Parameters:

• &fields[resource]=field1,field2 will only show the specified fields for a given resource.
• &include=resource show the relationship for a given resource.
• &include=resource.resource2 show the relationship field for those depending on resource2.
• &sort=field1,-field2 sort by field2 as DESC and field1 as ASC.
• &sort=-field1,field2 sort by field1 as DESC and field2 as ASC.
• &page[number] will return the current page elements in a page-based pagination strategy.
• &page[size] will return the total amout of elements in a page-based pagination strategy.
• &page[limit] will return the limit in a offset-based pagination strategy.
• &page[offset] will return the offset value in a offset-based pagination strategy.
• &page[cursor] will return the cursor value in a cursor-based pagination strategy.
• &filter will return data passed in the filter param.

NilPortugues\Api\JsonApi\Http\Request\Request

Given the query parameters listed above, Request implements helper methods that parse and return data already prepared.

namespace \NilPortugues\Api\JsonApi\Http\Request;

class Request
{
  public function __construct(ServerRequestInterface $request = null) { ... }
  public function getIncludedRelationships() { ... }
  public function getSort() { ... }
  public function getPage() { ... }
  public function getFilters() { ... }
  public function getFields() { ... }
}

Response objects (JsonApiResponseTrait)

The following JsonApiResponseTrait methods are provided to return the right headers and HTTP status codes are available:

    private function errorResponse($json);
    private function resourceCreatedResponse($json);
    private function resourceDeletedResponse($json);
    private function resourceNotFoundResponse($json);
    private function resourcePatchErrorResponse($json);
    private function resourcePostErrorResponse($json);
    private function resourceProcessingResponse($json);
    private function resourceUpdatedResponse($json);
    private function response($json);
    private function unsupportedActionResponse($json);

Integration with NelmioApiDocBundleBundle

The NelmioApiDocBundle is a very well known bundle used to document APIs. Integration with the current bundle is terrible easy.

Here's an example following the PostContoller::getPostAction() provided before:

<?php
namespace AppBundle\Controller;

use NilPortugues\Symfony\JsonApiBundle\Serializer\JsonApiResponseTrait;
use Symfony\Bundle\FrameworkBundle\Controller\Controller;

class PostController extends Controller
{
    use JsonApiResponseTrait;

    /**
     * Get a Post by its identifier. Will return Post, Comments and User data.
     *
     * @Nelmio\ApiDocBundle\Annotation\ApiDoc(
     *  resource=true,
     *  description="Get a Post by its unique id",
     * )
     *
     * @Symfony\Component\Routing\Annotation\Route("/post/{postId}", name="get_post")
     * @Sensio\Bundle\FrameworkExtraBundle\Configuration\Method({"GET"})
     *
     * @param $postId
     * @return \Symfony\Component\HttpFoundation\Response
     */
    public function getPostAction($postId)
    {
        $post = $this->get('doctrine.post_repository')->find($postId);
        
        $serializer = $this->get('nil_portugues.serializer.json_api_serializer');

        /** @var \NilPortugues\Api\JsonApi\JsonApiTransformer $transformer */
        $transformer = $serializer->getTransformer();
        $transformer->setSelfUrl($this->generateUrl('get_post', ['postId' => $postId], true));
        $transformer->setNextUrl($this->generateUrl('get_post', ['postId' => $postId+1], true));

        return $this->response($serializer->serialize($post));
    }
} 

And the recommended configuration to be added in app/config/config.yml

#app/config/config.yml

nelmio_api_doc:
  sandbox:
        authentication:
          name: access_token
          delivery: http
          type:     basic
          custom_endpoint: false
        enabled:  true
        endpoint: ~
        accept_type: ~
        body_format:
            formats: []
            default_format: form
        request_format:
            formats:
                json: application/vnd.api+json
            method: accept_header
            default_format: json
        entity_to_choice: false

Quality

To run the PHPUnit tests at the command line, go to the tests directory and issue phpunit.

This library attempts to comply with PSR-1, PSR-2, PSR-4 and PSR-7.

If you notice compliance oversights, please send a patch via Pull Request.

Contribute

Contributions to the package are always welcome!

• Report any bugs or issues you find on the issue tracker.
• You can grab the source code at the package's Git repository.

Support

Get in touch with me using one of the following means:

• Emailing me at [email protected]
• Opening an Issue
• Using Gitter:

Authors

• Nil Portugués Calderó
• The Community Contributors

License

The code base is licensed under the MIT license.