Hi Folks,

Got a question abouut retrieving a child and adding it to an existing parent's child collection (specifically if its possible).

For example: Blog is a parent, BlogEntry is a child of Blog. Blog has a BlogEntries bag (IList).

The BlogEntries bad is lazy loaded.

Situation:
a Blog is retrieved from the database. The BlogEntries are not retireved (as the collection is lazy loaded).

I want to retrieve a specific BlogEntry and get it into the Blog's BlogEntries list.

Can this be done? How can this be done?

-s

Hi,

Retrieving children into persistent collection is transparent in NHibernate (even if lazy loaded). Just access your lazy loaded list and it will be automaticly initialized, if only you have the Session open between fetching the parent object and accessing collection.
I don't think you can get "specific" child with such design, if you need it I suggest replacing BlogEntries bag with a method e.g. "BlogEntry getEntryById(int id) ..." and doing a Session.Load(...) there.

That's kinda what I figured :(

I'm kinda stuck on a Domain-Driven Design problem where I only want to get BlogEntry instances through the Blog.

In my case, I have an existing Blog instance that was retrieved from NH. It's lazy-loaded blog entries list is already assigned an NH bag, so arbitrarilly adding to it isn't an option since I'm not looking for save or update behavior on teh BlogEntry instances in the collection.

I think I can make this work if I evict the Blog entity, retrieve the BlogEntry, and add it to the list.

Cheers,
Scott