koel/app/Models/User.php

<?php

namespace App\Models;

use Illuminate\Auth\Authenticatable;
use Illuminate\Auth\Passwords\CanResetPassword;
use Illuminate\Contracts\Auth\Access\Authorizable as AuthorizableContract;
use Illuminate\Contracts\Auth\Authenticatable as AuthenticatableContract;
use Illuminate\Contracts\Auth\CanResetPassword as CanResetPasswordContract;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Foundation\Auth\Access\Authorizable;

class User extends Model implements
AuthenticatableContract,
                                    AuthorizableContract,
                                    CanResetPasswordContract
{
    use Authenticatable, Authorizable, CanResetPassword;

    /**
     * The database table used by the model.
     *
     * @var string
     */
    protected $table = 'users';

    /**
     * The attributes that are protected from mass assign.
     *
     * @var array
     */
    protected $guarded = ['id'];

    protected $casts = [
        'id' => 'int',
        'is_admin' => 'bool',
    ];

    /**
     * The attributes excluded from the model's JSON form.
     *
     * @var array
     */
    protected $hidden = ['password', 'remember_token', 'created_at', 'updated_at'];

    public function playlists()
    {
        return $this->hasMany(Playlist::class);
    }

    public function interactions()
    {
        return $this->hasMany(Interaction::class);
    }
}