blue-twilight/app/User.php

<?php

namespace App;

use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;

class User extends Authenticatable
{
    use Notifiable;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'email', 'password', 'is_admin', 'is_activated', 'activation_token'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token', 'activation_token'
    ];

    public static function administrators()
    {
        return User::where('is_admin', true)->get();
    }

    public static function anonymous()
    {
        $user = new User();
        $user->id = -1;
        $user->name = 'Anonymous';

        return $user;
    }

    public function groups()
    {
        return $this->belongsToMany(Group::class, 'user_groups');
    }

    public function isAnonymous()
    {
        return $this->id == -1 && $this->name == 'Anonymous';
    }
}