NHibernate configuration for uni-directional one-to-many relation

Question

I\'m trying to set up a relationship as follows. Each Master item has one or more Detail items:

public class Detail {
    p         


        

Answer 1

NH3 and above allow to correct save entities in case of uni-directional one-to-many mapping without annoying save null-save-update cycle, if you set both not-null="true" on and inverse="false" on

FluentNHibernate code snippet for that:

public class MasterMap : ClassMap 
{
    public MasterMap() 
    {
        Id(x => x.MasterId);
        Map(x => x.Name);
        HasMany(x => x.Details)
            .Not.Inverse()     //these options are very
            .Not.KeyNullable() //important and work only if set together 
            .Not.KeyUpdate()   //to prevent double update
            .Cascade.All();
    }
}