Multicast Attributes

Sometimes model states are represented in the database by multiple timestamp columns. The belog example of PostStatus state is derived from multiple attributes.

Multicasting states to attributes can even be used in conjunction with direct casting.

enum PostStatus: string
{
    use HasEnumState;

    case CREATED = 'created';
    case PUSBLSHED = 'published';
    case PENDING_APPROVAL = 'pending';
    case APPROVED = 'approved';
    case ARCHIVED = 'archived';

    public static function states()
    {
        return [
            State::on(
                self::CREATED,
                self::PUSBLSHED,
                get: fn ($state, Post $model, $attributes) => (bool) $model->created_at && !$model->published_at
            ),
            State::on(
                self::PUSBLSHED,
                self::PENDING_APPROVAL,
                get: fn ($state, Post $model, $attributes) => (bool) $model->published_at,
                set: fn () => ['published_at' => now()],
            ),
            State::on(
                self::PENDING_APPROVAL,
                self::APPROVED,
                get: fn ($state, Post $model, $attributes) => (bool) $model->published_at && ! $model->approved_at,
                set: fn () => ['published_at' => null],
            ),
            State::on(
                self::APPROVED,
                [self::PENDING_APPROVAL],
                get: fn ($state, Post $model, $attributes) => (bool) $model->approved_at,
                set: fn () => ['approved_at' => now()],
            ),
            State::on(
                self::ARCHIVED,
                get: function($state, Post $model, $attributes){
                  if($model->published_at){
                    // archived after 100 years
                    return $model->published_at->after(now()->addYears(100));
                  }
                  return false;
                },
            ),
        ];
    }
}

Use state as usual:

/**
 * @property PostStatus $status
 */
class Post extends Model{
    protected $casts = [
        'created_at' => 'datetime',
        'published_at' => 'datetime',
        'approved_at' => 'datetime',
        'archived_at' => 'datetime',
    ];

    protected function status(): Attribute{
        return PostStatus::useAttribute();
    }
}

Now, updating state will update model attributes:

if($post->status->is('pending')){
    $post->status->markAs('approved');
    dump($post->approved_at); // now
}