Is inheritance possible with the NHibernate.Mapping.Attirbutes contrib?

Yes, it should work.

If I have a DomainBase class that defines ID and a User class that inherits DomainBase, where do I put the attribute for ID?

In the database, the column name for ID is UserID, RoleID, XxxxID, etc.

NHibernate.Mapping.Attributes mimics XML mapping; so if you can figure out how to write your mapping using XML, you can easily write it using attributes.

Note that the project NHibernate.Mapping.Attributes.Test contains classes mapped using most attributes; you can take a look to see how it is done...

I can get it to work in XML mapping no problem. The problem begins when I have a base class like this:

public abstract class PersistentObjectBase
{
private int id;

[Id( 0, Name = "ID", TypeType = typeof ( int ),
UnsavedValue = "0" )]
[Generator( 1, Class = "identity" )]
public virtual int ID
{
get { return id; }
set { id = value; }
}
}

Now add this class :

[Class( 0, NameType = typeof ( AppUser ) )]
public class AppUser : PersistentObjectBase
{
[Cache( 1, Usage = CacheUsage.ReadWrite )]

public AppUser() : base() {}

}

Where am I supposed to define the column name now? It's different per class so I can't define it in the base class.

bump!

Does anyone have any input on this?

ATM, the only solution is to move the mapping attributes to "AppUser" and other classes (but the properties can stay in the base class).

This problem gave me an idea of how NHMA can be improved to nicely solve this problem.
Cf. http://jira.nhibernate.org/browse/NH-684
Hopefully, it should be in NH1.2.0.Alpha2.

Here's the changes:

public abstract class PersistentObjectBase
{
private int id;

public virtual int ID
{
get { return id; }
set { id = value; }
}
}


[Class( 0, NameType = typeof ( AppUser ) )]
public class AppUser : PersistentObjectBase
{
[Cache( 1, Usage = CacheUsage.ReadWrite )]

public AppUser() : base() {}

[Id( 0, Name = "ID", TypeType = typeof( int ), Column = "AppUserID", UnsavedValue = "0" )]
[Generator( 1, Class = "identity" )]

}


When I try that, the resulting xml looks like this:

<class name="Model.AppUser, Model" table="AppUser">
<cache usage="read-write" />
<id name="ID" column="AppUserID" type="Int32" unsaved-value="0" />

It doesn't add the [Generator( 1, Class = "identity" )] to the stream which throws an exception "Could not configure datastore from input stream."

There is something wrong with your mapping...
Can you post the whole class AppUser?

The class is pretty big, but the thing is the mappings all work fine. When it looks like this:



it works fine. But for some reason when you remove the ID property, the second part of the attribute never makes it into the mapping:

You can either put the Id (and Generator) on another property or renumber following attributes: [Bag(2)]...

By the way, I just added a new feature to fix your problem:
Cf. http://jira.nhibernate.org/browse/NH-684
So you can grap the SVN version and use it :)

Thanks for fixing the problem KPixel. That was the same issue I was having.

Great! Thanks.

I got it plugged in and it's working great, thanks again.