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4.0.0

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Laravel Smokescreen

Overview

Laravel Smokescreen is a package for transforming your Laravel models, and other entities.

Transform API responses
Transform Job and Event payloads
Minimal boiler-plate and bootstrap
Supports complex relationships for embedded data
Supports eager loading of relationships
Allows transforming different types of resources
Can handle serializing to customisable formats

This package tightly integrates the rexlabs/smokescreen (Vanilla PHP) package with the Laravel framework, to provide the convenience and minimal boilerplate when working with Laravel applications.

Usage

<?php
class MyController extends Controller
{
    public function index()
    {
        return Smokescreen::transform(Post::paginate());
    }
    
     public function show(Post $post)
     {
        return Smokescreen::transform($post);
     }
}

laravel-smokescreen is bootstrapped into Laravel's app container, so you can also type-hint it to be injected into your controller's constructor or methods.
Using the facade (as above) is recommended within controller methods, use type-hinting in service classes (if needed)
You can also use it directly from the container via app('smokescreen') as shown above.
Since we implement the Responsable interface, you can simply return smokescreen from any controller method.

Requirements

PHP >= 7.0
Laravel >= 5.5

Installation

This package is currently hosted on RexSoftware's private packagist repository. First ensure you have configured your composer.json to use this repository.

Install package

composer require rexlabs/laravel-smokescreen

This package will be auto-discovered, and no additional configuration is necessary.

Configuration

To publish the configuration file to your app/config folder, run the following command:

php artisan vendor:publish --provider='RexlabsLaravelSmokescreenProvidersServiceProvider --tag=config'

This will create config/smokescreen.php:

<?php
return [
    // Set the default namespace for resolving transformers when
    // they are not explicitly provided.
    'transformer_namespace' => 'AppTransformers',
    
    // Override the default serializer to be used.
    // If not specified - the Smokescreen DefaultSerializer will be used.
    'default_serializer' => null,

    // Set the default request parameter key which is parsed for
    // the list of includes.
    'include_key' => 'include',
];

API

transform(): Set resource to be transformed

$smokescreen->transform(mixed $resource, mixed $transformer = null);

<?php
$smokescreen->transform(Post::find(1));
$smokescreen->transform(Post::all());
$smokescreen->transform(Post::paginate());
$smokescreen->transform(Post::find(1), new SomeOtherTransformer);

Smokescreen will automatically determine the type of resource being transformed.
It will also infer the Transformer class to use if not provided.

item(): Set single item resource to be transformed

$smokescreen->item(mixed $item, mixed $transformer = null);

<?php
$smokescreen->item(Post::find(1));
$smokescreen->item(Post::find(1), new SomeOtherTransformer);

Similar to transform() but only accepts a item.

collection(): Set collection resource to be transformed

$smokescreen->collection(mixed $collection, mixed $transformer = null);

<?php
$smokescreen->collection(Post::all());
$smokescreen->collection(Post::paginate());
$smokescreen->collection(Post::paginate(), new SomeOtherTransformer);

Similar to transform() but only accepts a collection.

transformWith(): Set the transformer to use on the previously set resource

$smokescreen->transformWith(TransformerInterface|callable $transformer);

<?php
$smokescreen->transform(Post::find(1))
    ->transformWith(new SomeOtherTransformer);

It's an alternative to passing the transformer directly to resource methods.

serializeWith(): Override the serializer to be used

<?php
$smokescreen->serializeWith(new MyCustomSerializer);

You only need to set this if you plan to use a different serialize than the default.
We provide DefaultSerializer as the default, it returns collections nested under a "data" node, and an item resource without any nesting.
Your custom serializer should implement the SerializerInterface interface.

loadRelationsVia(): Override the default Laravel relations loader

$smokescreen->loadRelationsVia(RelationsLoaderInterface $loader);

<?php
$smokescreen->loadRelationsVia(new MyRelationsLoader);

You only need to set this if you plan to use a different loader than the default,
We provide RelationsLoader as the default which eager-loads relationships for collection resources.
Your custom loader should implement the RelationsLoaderInterface interface and provide a load() method.

resolveTransformerVia(): Override the default transformer resolver

$smokescreen->loadTransformersVia(TransformerResolverInterface $loader);

<?php
$smokescreen->loadTransformersVia(new MyTransformerResolver);

The resolver is used when a transformer is not explicitly defined on a resource.
The default resolver in this package tries to find a matching transformer class within the path defined in smokescreen.transformer_namespace path, and instantiates it via the app container.
You only need to set this if you plan to use a different resolver than the default.
Your custom resolver should implement the TransformersLoaderInterface interface and provide a resolve(ResourceInterface) method.

response(): Access the generated response object

$response = $smokescreen->response(int $statusCode = 200, array $headers = [], int $options = 0);

<?php
$smokescreen->response()
    ->header('X-Custom-Header', 'boo')
    ->setStatusCode(405);

This method returns an IlluminateHttpJsonResponse object so it is not chainable.
All supported JsonResponse methods can be applied.
You can still return response() directly from your controller since it is a JsonResponse object.
You can alternatively use withResponse($callback) to apply changes, and still support chainability.
Note: the first call to response() caches the result so that the entire data set is not re-generated every time, this means passing any parameters on subsequent calls will be ignored. You can use clearResponse() or manipulate the JsonResponse object directly.

freshResponse(): Generate a fresh Response object

$response = $smokescreen->freshResponse(int $statusCode = 200, array $headers = [], int $options = 0);

Unlike response() this method returns a fresh non-cached JsonResponse object (by calling clearResponse() first).
This method returns an IlluminateHttpJsonResponse object so it is not chainable. See withResponse() for a chainable method.
All supported JsonResponse methods can be applied.

withResponse(): Apply changes to the generated response object

$smokescreen->withResponse(callable $apply);

<?php
$smokescreen->withResponse(function (JsonResponse $response) {
    $response->header('X-Crypto-Alert', 'all your coins are worthless!');
});

Provide a callback that accepts a JsonResponse object and manipulates the response
This method is chainable unlike response()

clearResponse(): Clear any cached response

$smokescreen->clearResponse();

<?php
$smokescreen->response();       // Data is generated, response object is built and cached
$smokescreen->response(500);    // NOPE - Cached, wont be changed!
$smokescreen->clearResponse();
$smokescreen->response(500);    // Response is re-generated

Reset's any cached response object

Transformers

Example Transformer

<?php
class PostTransformer extends AbstractTransformer
{
    protected $includes = [
        'user' => 'default|relation:user|method:includeTheDamnUser',
        'comments' => 'relation',
    ];

    public function transform(Post $post): array
    {
        return [
            'id' => $post->id,
            'user' => $this->when($post->user_id, [
                'id' => $post->user_id,
            ]),
            'title' => $post->title,
            'summary' => $post->summary,
            'body' => $post->body,
            'created_at' => utc_datetime($post->created_at),
            'updated_at' => utc_datetime($post->updated_at),
        ];
    }

    public function includeTheDamnUser(Post $post)
    {
        return $this->item($post->user); // Infer Transformer
    }

    public function includeComments(Post $post)
    {
        return $this->collection($post->comments, new CommentTransformer);
    }
}

You declare your available includes via the $includes array
Each include accepts 0 or more of the following directives:
- default: This include is always enabled regardless of the requested includes
- relation: Indicates that a relation should be eager-loaded. If the relation name is different specify it as relation:othername
- method: By default the include key is mapped to include{IncludeKey} you can provide the method to be used instead
Your transform() method should return an array.
Define your include methods in the format include{IncludeKey}(Model) - they should return either a collection() or an item()
when() is a simple helper method which accepts a condition and returns either the given value when true, or null (by default) when false. In the above example the "user" node will be null if there is no user_id set on the $post object.