public TopicHomepageController(IMediator mediator, ITopicHomepageQueries topicHomepageQueries)
 {
     this.mediator             = mediator;
     this.topicHomepageQueries = topicHomepageQueries;
 }
 public UpdateCommandHandler(ITopicHomepageRepository topicRepository, ITopicHomepageQueries topicQueries)
 {
     this.topicRepository = topicRepository;
     this.topicQueries    = topicQueries;
 }