I have a simple many-to-many relationship between the User class and
the Place class. This relationship is represented by the User's
"Neighbourhood" property
public class User
{
public virtual IList<UserPlace> Neighbourhood { get; set; }
}
The UserPlace class is just a component that adds a single piece of
information to the relationship between a User and a Place:
public class UserPlace
{
public virtual User User { get; set; }
public virtual Place Place { get; set; }
public virtual bool IsDefault { get; set; }
}
The relationship is mapped as follows:
public class UserMappings : ClassMap<User>
{
//... other mappings
HasMany(x => x.NeighbourHood)
.Component(c =>
{
c.Map(x => x.IsDefault);
c.References(x =>
x.Place).Cascade.None();
}
).Not.LazyLoad().Cascade.SaveUpdate();
}
When a user is created a number of Places are loaded from the database
and added to the user, with one of these being set to default. When
the user is persisted, the associated UserPlace entities are also
persisted.
The problem I'm experiencing is that each Place entity associated with
a UserPlace is also updated. That's not the desired effect, and I've
tried preventing the Cascade to Place from taking place (pun not
intended) by setting Cascade to None()... this doesn't change
anything, however.
I've only managed to stop this update from taking place by specifying
that each property on Place should not be updated
([PropertyName].Not.Updated()). This works, but it's not a solution.
Does anyone have any ideas on how I can prevent this from happening?
PS! I don't think it makes a difference to this scenario (but I may be
wrong!), but consider this also: The Place entities are loaded outside
of NHibernate (using ADO.NET and a stored procedure, because of some
geospatial querying I couldn't do with NHibernate) and then attached
to the session by calling Session.Update() on each entity.
I have posted this on StackOverflow as well:
http://stackoverflow.com/questions/5717208/preventing-a-cascading-update-of-a-many-to-many-relationship-with-nhibernate-flue
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