Laravel 5.5 Responsable Interface for Responses
Laravel 5.5 / July 25, 2017

Laravel 5.5 Responsable Interface for Responses

A new return type will be supported in Laravel 5.5 routes: the Responsable interface. This contract allows objects to be converted to an HTTP response instance when returned from a controller or route closure. A Responsable object needs to implement a toResponse() method which represents the object as an HTTP response.

<?php

use Illuminate\Contracts\Support\Responsable;

class ExampleObject implements Responsable
{
    public function __construct($name = null)
    {
        $this->name = $name ?? 'Teapot'; 
    }

    public function status()
    {
        switch(strtolower($this->name)) {
            case 'teapot':
                return 418;
            default:
                return 200;
        }
    }

    public function toResponse()
    {
        return response(
            "Hello {$this->name}",
            $this->status(),
            ['X-Person' => $this->name]
        );
    }
}

Using the ExampleObject in a route, you can now do something like this:

Route::get('/hello', function () {
    return new ExampleObject(request('name'));
});

In the framework, the Router class now checks for this type when preparing the response:

if ($response instanceof Responsable) {
    $response = $response->toResponse();
}

Let’s say you have various response types in the App\Http\Responses namespace to organize your responses. One example might look like this to support a Posts model:

<?php

namespace App\Http\Responses;

class PostIndexResponse extends Response
{
    public function __construct($posts)
    {
        $this->posts = $posts;
    }

    public function toResponse()
    {
        return response()->json($this->transformPosts());
    }

    protected function transformPosts()
    {
        return $this->posts->map(function ($post) {
            return [
                'title' => $post->title,
                'description' => $post->description,
                'body' => $post->body,
                'published_date' => $post->published_at->toIso8601String(),
                'created' => $post->created_at->toIso8601String(),
            ];
        });
    }
}

This is a basic example that illustrates a simple use-case. It returns a JSON response, but you might want the response layer include additional functionality like content negotiation. The example above also assumes an App\Http\Responses\Response class that could provide some base functionality. The response layer could also contain transformation code like Fractal instead of using it directly in the controller.

A controller that works with the PostsIndexResponse might look like the following:

<?php

namespace App\Http\Controllers;

use App\Http\Responses;

class PostsController extends Controller
{
    public function index()
    {
        $posts = \App\Post::all();

        return new Responses\PostIndexResponse($posts);
    }
}

Check out the commit implementing this contract. While simple, I think it will be interesting to see how people will use Responsable in Laravel 5.5.

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