Laravel Auto Presenter 是一套用在 view 裡的 decorates objects,搭配資料庫時,如果有需要組合或整合欄位來顯示相關資訊,這套就非常適合使用在 Laravel View 裡,如果不是透過 Laravel Auto Presenter,開發者也可以利用 Laravel Accessors & Mutators 來實現這方法,只是這要寫在 Model 層,寫法如下,此做法寫起來蠻亂的,而且也並不是每個地方都需要擴充這些欄位。
/** * The accessors to append to the model's array form. * * @var array */ protected $appends = [ 'is_twitter', ]; /** * Get the user's is_twitter flag. * * @param string $value * @return string */ public function getIsTwitterAttribute() { return (bool) ($this->attributes['options'] & self::$OPTIONS['is_twitter']); }
如果是使用 Laravel Auto Presenter 則寫法如下
<?php namespace App\Models\Presenters; use App\Models\User; use Illuminate\Contracts\Support\Arrayable; use McCool\LaravelAutoPresenter\BasePresenter; class UserPresenter extends BasePresenter implements Arrayable { public function __construct(User $resource) { $this->wrappedObject = $resource; } public function isTwitter() { return (bool) ($this->wrappedObject->info->options & self::$OPTIONS['is_twitter']); } /** * Get the instance as an array. * * @return array */ public function toArray() { return [ 'id' => $this->wrappedObject->id, 'isTwitter' => $this->isTwitter(), 'avatarUrl' => $this->avatarUrl(), ]; } }
但是使用在 Laravel View 裡面都可以正確拿到 isTwitter
欄位沒問題,如果要用在 RESTFul + 前端 ReactJS 的話,則要透過 Laravel Facades 來實現,加上 AutoPresenter::decorate
就可以在 Controller 內使用 AutoPresenter 了。
<?php use McCool\LaravelAutoPresenter\Facades\AutoPresenter; class MessageController extends Controller { /** * @var Repository */ private $user; public function __construct(UserRepository $user) { $this->user = $user; } public function index(Request $request) { $user = $this->user->with('info')->find(\Auth::id()); $state = collect([ 'user' => AutoPresenter::decorate($user), ]); return $state; } }