Question

I have a service object that is responsible for some business logic validation. What it does, before issing Update to repository, is checking whether entity that it works on complies to some business rules.

One of that rules that is must check is if Status property of the entity didn’t change when compared to entity that is in database. Because I use repositories that share the same ISession, when I try to get entity from database, in order to get an object for comparsion:

if (fromDbEntity.Status != entity.Status) throw new Exception("Cannot change status...");

I’ll always get fromDbEntity that is in 1st level cache – so I work on the same object.

Is there a way to force NHibernate/Repository to get entity from database even though it’s already in the scope of the session?

Answer 1

Evict entity from session before loading fromDbEntity

session.Evict(entity);

You can check the official documentation for more details: Managing the caches

The con about this is that you will need to manually call SaveOrUpdate for entity since now the object is out of the session.