Fluent Nhibernate Many-to-Many mapping with extra column, update - fluent-nhibernate

Question

Can not update / insert data into the database
This is the tables I have:
Role (Id, Name, ...)
Privilege (Id, Name, ...)
RolePrivilege (Id, RoleId, PrivilegeId, IsAllowed)
I have map:
public class RoleWithPrivilegesEntityMap : ClassMap<RoleWithPrivilegesEntity>
{
public RoleWithPrivilegesEntityMap()
{
Table( "ROLE" );
Not.LazyLoad();
Id( x => x.Id, "ID" ).GeneratedBy.Identity();
Map( x => x.Name, "NAME" ).Not.Nullable().Length( 100 );
HasMany(x => x.RolePrivileges)
.Cascade.AllDeleteOrphan()
.Inverse()
.Fetch.Join().KeyColumn("RoleId");
}
}
public class PrivilegeEntityMap : ClassMap<PrivilegeEntity>
{
public PrivilegeEntityMap()
{
Table("PRIVILEGE");
Id(x => x.Id, "ID").GeneratedBy.Identity();
Map(x => x.Name, "NAME").Not.Nullable();
HasMany(x => x.RolePrivileges)
.Cascade.AllDeleteOrphan()
.Inverse()
.Fetch.Join().KeyColumn("PrivilegeId");
}
}
public class RolePrivilegeEntityMap : ClassMap<RolePrivilegeEntity>
{
public RolePrivilegeEntityMap()
{
Table("ROLEPRIVILEGE");
Id(x => x.Id, "R_ID").GeneratedBy.Identity();
Map(x => x.IsAllowed, "ISALLOWED").Not.Nullable();
References(x => x.Role)
.Not.Nullable()
.Column("R_ID");
References(x => x.Privilege)
.Not.Nullable()
.Column("P_ID");
}
}
I'm trying to update existing record
session.SaveOrUpdate(rolePrivilege)
database make insert into table RolePrivilege, but I need to at first delete record.
what am I doing wrong?

Answer 1

normally nothing will go to the database at all because you never call session.Flush() or transaction.Commit(). However with Id generation Identity you basicly force NHibernate to insert immediately hence you see the INSERT statement.
You can also get rid of the Id in RolePrivilegeEntity and form a compositeId over Role and Priviledge which would also enhance performance (no need to insert immediatly).