Fluent NHibernate Repository with subclasses
- by reallyJim
Having some difficulty understanding the best way to implement subclasses with a generic repository using Fluent NHibernate.
I have a base class and two subclasses, say:
public abstract class Person
{
public virtual int PersonId { get; set; }
public virtual string FirstName { get; set; }
public virtual string LastName { get; set; }
}
public class Student : Person
{
public virtual decimal GPA { get; set; }
}
public class Teacher : Person
{
public virtual decimal Salary { get; set; }
}
My Mappings are as follows:
public class PersonMap : ClassMap
{
public PersonMap()
{
Table("Persons");
Id(x => x.PersonId).GeneratedBy.Identity();
Map(x => x.FirstName);
Map(x => x.LastName);
}
}
public class StudentMap : SubclassMap<Student>
{
public StudentMap()
{
Table("Students");
KeyColumn("PersonId");
Map(x => x.GPA);
}
}
public class TeacherMap : SubclassMap<Teacher>
{
public TeacherMap()
{
Table("Teachers");
KeyColumn("PersonId");
Map(x => x.Salary);
}
}
I use a generic repository to save/retreive/update the entities, and it works great--provided I'm working with Repository--where I already know that I'm working with students or working with teachers.
The problem I run into is this: What happens when I have an ID, and need to determine the TYPE of person? If a user comes to my site as PersonId = 23, how do I go about figuring out which type of person it is?
