Pardon my noobishness as I may often use the wrong terminology in
trying to describe my issue but several hours of searching is leaving
me empty-handed. I am using NHibernate with Fluent NHibernate for
mapping.
In my database I have a one to many relationship. I always see this
represented in a domain model where the parent entity has an
IList<child> property and mapping that works quite nicely. In my
particular case however, I need the ability to introduce a class in
the middle which contains the list of children so that my classes
would look something like:
class A
{
public virtual long Id { get; set; }
public virtual B Group { get; set; }
}
class B
{
public virtual IList<C> Children { get; set; }
}
class C
{
public virtual long Id { get; set; }
}
I've been able to generate schema and even persist but the
relationship is not preserved so that the child row's FK to the parent
ID is actually NULL. Here's what I was trying to cobble together for
my fluent maps:
public class AMap: ClassMap<A>
{
public AMap()
{
Id(x => x.Id).GeneratedBy.Identity();
Component(
x => x.Group,
y => y.HasMany(x => x.Children)
.KeyColumn("AId")
.AsBag()
.Cascade.All());
}
}
public class CMap: ClassMap<C>
{
public CMap()
{
Id(x => x.Id).GeneratedBy.Identity();
}
}
I'm not sure what else to do at this point. Because I am potentially
missing some fundamentals or don't know the proper terminology, I've
been unable to find any examples of this anywhere. I was hoping since
NH generally does such a great job at allowing you to map the domain
to schema that I could accomplish this without altering the schema and
adding an additional table.
Thanks in advance,
Alex
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