Basic question: How to I create a bidirectional one-to-many map in Fluent NHibernate?
Details:
I have a parent object with many children. In my case, it is meaningless for the child to not have a parent, so in the database, I would like the foreign key to the parent to have NOT NULL constraint. I am auto-generating my database from the Fluent NHibernate mapping.
I have a parent with many child objects like so:
public class Summary
{
public int id {get; protected set;}
public IList<Detail> Details {get; protected set;}
}
public class Detail
{
public int id {get; protected set;}
public string ItemName {get; set;}
/* public Summary Owner {get; protected set;} */ //I think this might be needed for bidirectional mapping?
}
Here is the mapping I started with:
public class SummaryMap : ClassMap<Summary>
{
public SummaryMap()
{
Id(x => x.ID);
HasMany<Detail>(x => x.Details);
}
}
public class DetailMap : ClassMap<Detail>
{
public DetailMap()
{
Id(x => x.ID);
Map(x => x.ItemName).CanNotBeNull();
}
}
In the Detail table, the Summary_id should be Not Null, because in my case it is meaningless to have a Detail object not attached to the summary object. However, just using the HasMany() map leaves the Summary_id foreign key nullable.
I found in the NHibernate docs (http://www.hibernate.org/hib_docs/nhibernate/html/collections.html) that "If the parent is required, use a bidirectional one-to-many association".
So how do I create the bidirectional one-to-many map in Fluent NHibernate?