You do not *need* a bidirectional, however life will sadly be a lot easier
with one. If you don't have a bi-directional, and you attempt to delete a
child, without also removing that child from the parent, then you will get a
cascade exception. Having the bi-directional in place means that your child
can remove itself from the parent collection.
Not that the above scenario is only important if children can be deleted
independantly of the parent association eg. you have an OrderLine, which
does not reference Order, and you want to delete a single OrderLine that
you're passed in a repository command that looks like: void Delete(OrderLine
orderLine);
On Tue, Sep 15, 2009 at 11:08 AM, griti <gritiba...@gmail.com> wrote:
>
> Got it working, had the reference from child to parent once
> implemented but had not the inverse(), so I added the reference back.
>
> Now I have the reference without .inverse().. do I need it in any
> case?
>
>
>
> On 15 Sep., 17:21, griti <gritiba...@gmail.com> wrote:
> > Forgot to mention that the database is setting the IDs of the objects,
> > maybe this is also a problem for nhibernate?
> >
> > On 15 Sep., 17:13, griti <gritiba...@gmail.com> wrote:
> >
> >
> >
> > > Thanks for the input, now it's storing the fk as expected for Log ->
> > > LogEntry.
> >
> > > For this case I don't need any reference back from the child.
> >
> > > When I remove .Inverse(), I get the following error:
> > > [InvalidOperationException: Collection was modified; enumeration
> > > operation may not execute.]
> >
> > > What I do: Load an existing Log, add a new LogEntry and there I add a
> > > new LogEntryValue. Now I would like to save the Log again and have
> > > LogEntry and LogEntryValue saved. Is this only possible with a
> > > reference back to the parents?
> >
> > > Regards
> >
> > > On 15 Sep., 16:33, Hudson Akridge <hudson.akri...@gmail.com> wrote:
> >
> > > > You have .Inverse() marked on all of your OTM collections, but do not
> have a
> > > > reference back from the child side to the parent in the mapping using
> a
> > > > References(). In that case, an inverse is not what you'd want to set
> up on
> > > > the OTM.
> > > > Although, if a bi-directional is what you're looking for, then you
> will need
> > > > a reference back to the parent from the child.
> >
> > > > On Tue, Sep 15, 2009 at 8:33 AM, griti <gritiba...@gmail.com> wrote:
> >
> > > > > Hi there
> >
> > > > > I am working in a prototype with fluent nhibernate 1.0 and
> nhibernate
> > > > > 2.1. So far the rules seemed logical to me. But now I have some
> kind
> > > > > of troubles getting the fk of the parent to the child's table.
> >
> > > > > I have 3 tables(simplified):
> >
> > > > > Log:
> > > > > -ID
> > > > > -Type
> >
> > > > > LogEntry:
> > > > > -ID
> > > > > -Log_Id
> > > > > -Action
> >
> > > > > LogEntryValues:
> > > > > -ID
> > > > > -LogEntry_Id
> > > > > -Value
> >
> > > > > The classes are quite simple, Log and LogEntry have each a a iList
> of
> > > > > their childs which can be null.
> >
> > > > > The mapping looks like this:
> > > > > public class LogMap : ClassMap<Log>
> > > > > {
> > > > > LogMap()
> > > > > {
> > > > > LazyLoad();
> > > > > Id(x => x.Id);
> > > > > Map(x => x.Type);
> > > > > HasMany(x => x.LogEntries).Inverse().Cascade.All();
> > > > > }
> > > > > }
> >
> > > > > public class LogEntryMap : ClassMap<LogEntry>
> > > > > {
> > > > > LogEntryMap()
> > > > > {
> > > > > LazyLoad();
> > > > > Id(x => x.ID);
> > > > > Map(x => x.action).CustomType(typeof
> > > > > (Enumerations.Enumerators.DatabaseActions));
> > > > > HasMany(x => x.LogValues).Inverse().Cascade.All();
> > > > > }
> > > > > }
> >
> > > > > public class LogEntryValuesMap : ClassMap<LogEntryValues>
> > > > > {
> > > > > LogEntryValuesMap()
> > > > > {
> > > > > LazyLoad();
> > > > > Id(x => x.ID);
> > > > > Map(x => x.Value);
> > > > > ReadOnly();
> > > > > }
> > > > > }
> >
> > > > > What I think might be wrong is the configuration of fluent
> nhibernate:
> > > > > private static ISessionFactory SessionFactory
> > > > > {
> > > > > get
> > > > > {
> > > > > if (sessionFactory == null)
> > > > > {
> >
> > > > > try
> > > > > {
> > > > > String luceneIndexPath =
> > > > > AppDomain.CurrentDomain.SetupInformation.ApplicationBase +
> > > > > @"\Lucene_index";
> > > > > if (!System.IO.Directory.Exists
> > > > > (luceneIndexPath))
> > > > > System.IO.Directory.CreateDirectory
> > > > > (luceneIndexPath);
> >
> > > > > sessionFactory = Fluently.Configure()
> > > > > .Database
> > > > > (MsSqlConfiguration.MsSql2005
> > > > > .ConnectionString(c
> =>
> > > > > c.Is(connectionString))
> > > > > .ShowSql()
> > > > > .ProxyFactoryFactory
> > > > > ("NHibernate.ByteCode.LinFu.ProxyFactoryFactory,
> > > > > NHibernate.ByteCode.LinFu "))
> > > > > .Mappings(m =>
> > > > > m.FluentMappings.AddFromAssemblyOf<AxendoAnmeldung>())
> > > > > .ExposeConfiguration(x
> =>
> > > > > {
> > > > > //
> > > > > NHibernate.Search Config
> > > > > //x.SetProperty
> > > > > ("hibernate.search.default.directory_provider", typeof
> > > > > (RAMDirectoryProvider).AssemblyQualifiedName);
> >
> > > > > x.SetProperty
> > > > > ("hibernate.search.default.directory_provider", typeof
> > > > > (FSDirectoryProvider).AssemblyQualifiedName);
> > > > > x.SetProperty
> > > > > ("hibernate.search.default.indexBase", luceneIndexPath);
> >
> > > > > //NHibernate
> > > > > Config
> > > > > x.SetProperty
> > > > > ("current_session_context_class", "web");
> > > > > })
> > > > > .BuildSessionFactory();
> > > > > }
> > > > > catch (Exception ex)
> > > > > {
> > > > > throw ex;
> > > > > }
> > > > > }
> > > > > return sessionFactory;
> > > > > }
> > > > > }
> >
> > > > > My Database is MS SQL Server 2005, the fk's are set to their
> > > > > corresponding parent-ids.
> >
> > > > > Any hints what's missing?
> >
> > > > > Regards
> >
> > > > --
> > > > - Hudsonhttp://www.bestguesstheory.comhttp://
> twitter.com/HudsonAkridge
> >
>
--
- Hudson
http://www.bestguesstheory.com
http://twitter.com/HudsonAkridge
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