Controllers e mecanismos de transporte

TasksController.php

<?php

use Acme\Repositories\TaskRepository;
use Acme\Repositories\UserRepository;
use Acme\Mailers\UserMailer;

class TasksController extends Controller
{
    /**
     * @var Acme\Repositories\TaskRepository
     */
    protected $tasks;

    /**
     * @var Acme\Repositories\UserRepository
     */
    protected $users;

    /**
     * @var Acme\Mailers\UserMailer
     */
    protected $mailer;

    /**
     * @param TaskRepository $tasks
     * @param UserRepository $users
     * @param UserMailer $mailer
     */
    function __construct(
        TaskRepository $tasks,
        UserRepository $users,
        UserMailer $mailer
    ) {
        $this->tasks = $tasks;
        $this->users = $users;
        $this->mailer = $mailer;
    }

    /**
     * @param string|int $task_id
     * @param string|int $user_id
     * @return mixed
     */
    public function transfer($task_id, $user_id)
    {
        $userTo = $this->users->find($user_id);
        $task = $this->tasks->find($task_id);

        $task->setUser($userTo);

        if ( ! $this->tasks->save($task))
        {
            return Redirect::to('tasks')
                ->withErrors($this->tasks->getErrors());
        }

        $this->mailer->notifyTaskTransference($task, $userTo);

        return Redirect::to('tasks')
            ->with(['message' => Lang::get('tasks.transfer.success']);
    }
}