Fluent mapping base class - Tried to add property when already added - fluent-nhibernate

Question

I have a base class that looks like this:
public abstract class MyBaseClass
{
public virtual DateTime UpdatedOn { get; set; }
}
I then have a series of other entities that inherit from this:
public class User : MyBaseClass
{
public virtual string UserName { get; set; }
public virtual string Password { get; set; }
}
My mapping for User would be:
public class UserMap : ClassMap<User>
{
public UserMap()
{
Id(x => x.UserName);
Map(x => x.Password);
Map(x => x.UpdatedOn);
}
}
I then have other entities, mapped the same way.
My problem is I get the following error:
Tried to add property 'UpdatedOn' when already added.
I guess this is because I map the UpdatedOn column in every entity?
Each of my tables has this UpdatedOn column, so how should I be mapping it?

Answer 1

Use a derived class in fluent nHibernate
This question should help you out. You can basically use a base fluent nhibernate mapping class to map your UpdatedOn column and derive all of your other mapping classes from that base class.

Answer 2

I had similar kind of situation. I did like this..it works...
I was supposed to exposes entities as Interface..
public interface IEntity
{
DateTime CreationDate { get; set; }
DateTime UpdationDate { get; set; }
}
public interface IUser : IEntity
{
DateTime UserName { get; set; }
DateTime Password { get; set; }
}
public interface IEmployee : IEntity
{
DateTime Name { get; set; }
DateTime Key { get; set; }
}
public abstract class Entity : IEntity
{
public virtual DateTime CreationDate { get; set; }
public virtual DateTime UpdationDate { get; set; }
}
public class User : Entity, IUser
{
public virtual string UserName { get; set; }
public virtual string Password { get; set; }
}
public class Employee : Entity, IEmployee
{
public virtual string Name { get; set; }
public virtual string Key { get; set; }
}
public class UserMap : ClassMap<User>
{
public UserMap()
{
Id(x => x.UserName);
Map(x => x.Password);
Map(x => x.CreationDate);
Map(x => x.UpdationDate);
}
}
public class EmployeeMap : ClassMap<Employee>
{
public EmployeeMap()
{
Id(x => x.Name);
Map(x => x.Key);
Map(x => x.UpdationDate);
Map(x => x.CreationDate);
}
}