I agree with Markus. NH should always persist what you have in memory. If you have multiple references in memory and want to remove them all at once, you need to do this in the business logic. Then you can expect from NH to do the same in the database.
The business logic should always look after itself. It should also work if there is NO NHibernate around. So NHibernate is not ALLOWED to do anything else than persisting the memory state. This would make the business logic dependent to it. On 20 Jan., 01:12, todd brooks <[email protected]> wrote: > I have three entities: Customer, Device and LocationTag. > > Customers have a list of LocationTags (nothing more than an ID and a > Description). They also have a list of Devices. > > Devices are tagged with a subset of the Customer's LocationTags, so > Devices have a List of LocationTags, too (but only of the Customer's). > > If I delete a LocationTag from the Customer's list, I would like it > also to cascade delete from the list of LocationTags in the Device. > Currently, I have it working but with manual code in the domain object > classes, but violates DRY in my opinion. > > Is it possible to accomplish this via NHibernate? > > Better question is whether or not these should even be attempted in > NHibernate as opposed to putting that logic in the domain object(s). > > Simplified Fluent NHib mappings: > > Customer > > public CustomerMap() > { > WithTable("Customers"); > > Id(x => x.ID) > .WithUnsavedValue(0) > .GeneratedBy.Identity(); > > Map(x => x.Name); > > HasMany<LocationTag>(t => t.LocationTags).IsInverse(); > > HasMany<Device>(d => d.Devices).IsInverse(); > } > > Device > > public DeviceMap() > { > WithTable("Devices"); > > Id(x => x.ID) > .WithUnsavedValue(0) > .GeneratedBy.Identity(); > > Map(x => x.Name); > > HasMany<LocationTag>(x => x.LocationTags).IsInverse(); > } > > LocationTag > > public LocationTagMap() > { > WithTable("LocationTags"); > > Id(x => x.ID) > .WithUnsavedValue(0) > .GeneratedBy.Identity(); > > Map(x => x.Description); > } --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "nhusers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nhusers?hl=en -~----------~----~----~----~------~----~------~--~---
