NHibernate Save and Commit in one Transaction

NHibernate Save and Commit in one Transaction

I have the following code that creates a new bookmark and adds one or more
tags to it. If a tag does not already exist it is created and added to the
bookmark.
Bookmark bookmark = new Bookmark();
bookmark.Title = request.Title;
bookmark.Link = request.Link;
bookmark.DateCreated = request.DateCreated;
bookmark.DateModified = request.DateCreated;
bookmark.User = _userRepository.GetUserByUsername(request.Username);
IList<Tag> myTags = _tagRepository.GetTags(request.Username);
IList<string> myTagsToString = myTags.Select(x => x.Title).ToList<string>();
foreach (var tag in request.Tags)
{
if (myTagsToString.Contains(tag))
{
Tag oldTag = myTags.SingleOrDefault(x => x.Title == tag);
bookmark.Tags.Add(oldTag);
}
else
{
Tag newTag = new Tag();
newTag.Title = tag;
newTag.User = _userRepository.GetUserByUsername(request.Username);
newTag.DateCreated = request.DateCreated;
newTag.DateModified = request.DateCreated;
bookmark.Tags.Add(newTag);
}
}
_bookmarkRepository.Add(bookmark);
_uow.Commit();
I implemented unit of work but I am not sure if I did this correctly. I
use the save method followed by a commit. The save method inserts the
bookmark and tags to the database and the commit method does an insert to
the junction table (bookmarks have many tags and tags have many
bookmarks).
So everything is inserted correctly. But if I remove the commit method the
bookmark and tags still get inserted. But their is no insert to the
junction table. Does this mean these inserts are not in the same
transaction since commit is not necessary to save the bookmark and tags to
the database? The commit is only necessary to save the relationship
between tags and bookmarks.
EDIT:
Repository
public abstract class Repository<T, TEntityKey> where T : IAggregateRoot
{
private IUnitOfWork _uow;
public Repository(IUnitOfWork uow)
{
_uow = uow;
}
public void Save(T entity)
{
SessionFactory.GetCurrentSession().SaveOrUpdate(entity);
}
public void Add(T entity)
{
SessionFactory.GetCurrentSession().Save(entity);
}
public void Remove(T entity)
{
SessionFactory.GetCurrentSession().Delete(entity);
}
public IEnumerable<T> FindAll()
{
ICriteria criteriaQuery =
SessionFactory.GetCurrentSession().CreateCriteria(typeof(T));
return (List<T>)criteriaQuery.List<T>();
}
}
UnitOfWork
public class NHUnitOfWork : IUnitOfWork
{
public void RegisterAmended(IAggregateRoot entity)
{
SessionFactory.GetCurrentSession().SaveOrUpdate(entity);
}
public void RegisterNew(IAggregateRoot entity)
{
SessionFactory.GetCurrentSession().Save(entity);
}
public void RegisterRemoved(IAggregateRoot entity)
{
SessionFactory.GetCurrentSession().Delete(entity);
}
public void Commit()
{
using (ITransaction transaction =
SessionFactory.GetCurrentSession().BeginTransaction())
{
try
{
transaction.Commit();
}
catch (Exception ex)
{
transaction.Rollback();
throw;
}
}
}
}
BookmarkRepository
public class BookmarkRepository : Repository<Bookmark, int>,
IBookmarkRepository
{
public BookmarkRepository(IUnitOfWork uow)
: base(uow)
{
}
}