Question

I have a problem that is driving me crazy. I’ve been searching around and found some possible solutions, but none with any result. I’ll try to explain as good as I can.

I have two models, PostModel (parent) and CommentModel (child). For better understanding, my mapping looks like this:

Mapping for Post:

public class PostMap : ClassMap<PostModel> 
{
    public PostMap()
    {
        // Table
        Table("Post");

        // Relations
        HasMany<CommentModel>(o => o.Comments).KeyColumn("PostId").Inverse().Cascade.AllDeleteOrphan();
    }
}

Mapping for comment:

public class CommentMap : ClassMap<CommentModel> 
{
    public CommentMap()
    {
        // Table
        Table("Comment");

        // References
        References<PostModel>(o => o.Post).Column("PostId");
    }
}

Now, what I’m trying to do is to delete a comment entity from post like this:

public void DeleteComment(CommentModel commentToDelete) 
{
    // Delete from list
    commentToDelete.Post.Comments.Remove(commentToDelete);

    // Update parent
    Update(commentToDelete.Post);
}

The result? Nothing is happening. Nothing is deleted from the list, no exceptions or what so ever. Does anyone have a solution for this, or any thoughts? I really appreciate all help I can get.

TIA!

Answer 1

If you set Inverse() you will have to update your comment

I suggest this approach:

public void DeleteComment(CommentModel commentToDelete) 
{
    // Delete from list
    commentToDelete.Post.Comments.Remove(commentToDelete);

    // This is needed because the Comments is an Inverse collection
    commentToDelete.Post = null;

    // Update parent
    Update(commentToDelete.Post);

    // Delete the comment
    Delete(commentToDelete);
}

If you always remove your associations in both objects, you should not have problems.

You can also remove the Inverse

HasMany<CommentModel>(o => o.Comments).KeyColumn("PostId").Cascade.AllDeleteOrphan();