I have a user class and a device class.
i need to add properties to a table,
this table is created via the user.hbm.xml by many-to-many declaration
as follows:

<bag name="Devices" table="tbl_Workouts" lazy="false">
<key column="user_id"/>
<many-to-many class="DAL.Entities.Device, DAL" column="device_id"/>
</bag>

the result is a table with a user_id and device_id keys
I need to add properties to this table but cant find help anywhere on the net on how to do so.

your help is required

It sounds like you have a many-to-many relationship with additional properties. A similar example is a relationship between Employees and Projects with the Employee having a Role on the Project.

If this is the case, I would usually model the link (many-to-many) table as an entity with a many-to-one relationship to each side of the relationship. So you would have a UserDevice entity. User and Device would both have a one-to-many relationship with UserDevice.

I just started doing so but in a sllitly diffrent version:
i created a class DeviceUsage which inherits device and adds properties.
now all i need to do is change the user.hbm.xml bag mapping from "many-to-many" to "one-to-many" and replace the device with deviceusage inside the bag.
do u think it would work ?
(anyway thanx for your previous reply)

Took me 5 minutes to see my idea would not work.
Implementing your idea is the best solution
i'm having trouble underestanding somthing tough..

in this case the user and device have hbm.xml without connection to any other entity, on the other hand the userdevice actually keeps the user_id and device_id data ?

User will have a UserDevice collection (one-to-many)
Device will have a UserDevice collection (one-to-many)
UserDevice will have User and Device properties (both one-to-many)