PostRepository.cs

  public async Task<Post> Add(Post domain)
        {
            var post = new Enities.Post
            {
                Title = domain.Title,
                CreatedDate = domain.CreatedDate,
                ModifiedDate = domain.ModifiedDate,
                Content = domain.Content
            };

            await _cmsDbContext.Posts.AddAsync(post);
            await _cmsDbContext.SaveChangesAsync();

            return new Post
            {
                Content = post.Content,
                ModifiedDate = post.ModifiedDate,
                Title = post.Title,
                CreatedDate = post.CreatedDate,
                Id = post.Id
            };
        }