public PostDetailModel Create(PostDetailModel postModel, UserDetailModel authorModel)
        {
            using (var dbContext = _dbContextFactory.CreateTeamChatDbContext())
            {
                postModel.CreationTime = DateTime.Now;
                postModel.Author       = UserMapper.DetailToListModel(authorModel);
                var postEntity = PostMapper.MapDetailModelToEntity(postModel);
                postEntity.Author = UserMapper.MapToEntity(authorModel);

                var userEntity = dbContext.Users
                                 .First(u => u.Id == authorModel.Id);

                userEntity.Activities.Add(postEntity);
                dbContext.Users.Update(userEntity);
                dbContext.Posts.Update(postEntity);
                dbContext.SaveChanges();
                return(PostMapper.MapToDetailModel(postEntity));
            }
        }