NHibernate 4.x Cookbook - Second Edition

Mapping a one-to-many relationship

It's usually necessary to relate an entity to other entities. For example, an order can be related to many order lines and to a customer. In this example, we'll show you how to map a one-to-many relationship between Movie and a new entity class, ActorRole.

Getting ready

Complete the previous Creating class hierarchy mappings recipe.

How to do it…

1. In Eg.Core, create a new class named ActorRole with the following code:

   namespace Eg.Core
   {
     public class ActorRole : Entity 
     {
   
       public virtual string Actor { get; set; }
       public virtual string Role { get; set; }
   
     }
   }

2. Create an embedded resource mapping for ActorRole with the following XML:

   <?xml version="1.0" encoding="utf-8" ?> <hibernate-mapping xmlns="urn:nhibernate-mapping-2.2" ...