Flarum\Api\Serializer\DiscussionBasicSerializer::lastPost PHP Method

protected lastPost ( $discussion ) : Relationship
return	Tobscure\JsonApi\Relationship

    protected function lastPost($discussion)
    {
        return $this->hasOne($discussion, 'Flarum\\Api\\Serializer\\PostBasicSerializer');
    }

DiscussionBasicSerializer