public PostResponse AddPost(Post post)
{
return(singltonDataContextService.Execute(c =>
{
var addedPost = c.Posts.Add(post);
c.SaveChanges();
RaiseEvent(new Observable <Post>(EventType.Added, addedPost.Entity));
return PostResponse.Success(addedPost.Entity);
}));
}
public PostResponse DeletePost(int postId)
{
return(singltonDataContextService.Execute(c =>
{
var existingPost = c.Posts.FirstOrDefault(p => p.PostId == postId);
if (existingPost == null)
{
return PostResponse.Failure(PostStatus.PostDoesNotExist);
}
c.Posts.Remove(existingPost);
c.SaveChanges();
RaiseEvent(new Observable <Post>(EventType.Deleted, existingPost));
return PostResponse.Success();
}));
}
public async Task <PostResponse> UpdatePost(int postId, Post updatedPost)
{
return(await singltonDataContextService.Execute(async c =>
{
var existingPost = c.Posts.FirstOrDefault(p => p.PostId == postId);
if (existingPost == null)
{
return await Task.FromResult(PostResponse.Failure(PostStatus.PostDoesNotExist));
}
var update = new Update <Post>
{
PropName = nameof(Post.Text),
OldValue = existingPost.Clone() as Post
};
existingPost.Text = updatedPost.Text;
await c.SaveChangesAsync();
RaiseEvent(new Observable <Post>(EventType.Added, existingPost, update));
return PostResponse.Success();
}));
}