[EMAIL PROTECTED] wrote: (to give you one reason: I need it myself :-) ) (end of quote)
in case you're wondering about a scenario that's very challenging without association classes, consider this case: 1. a user can have many roles 2. a role can have many users user [0..*] ---- [0..*] role 3. a user is linked to a regional office (the place where he's employed, we say this office to be 'primary') 4. a regional office may have many users user [0..*] ---- [1] regional office now the problem is that it's not sufficient to simply have roles assigned to users, the reason is that a user may go to any regional office and there he might have a different role example: I work as a 'manager' in Brussels, but I'm simply a 'guest' in Colorado Springs so there needs to be a link between user and role, this can be done using a foreign key to 'regional office' from within 'role' but then we would create an ambiguos relationship since there's already a link from 'user' to 'regional office' I hope I make sense here, .. I think association classes are extremely well suited in this case (just need to draw an association from this association class to 'regional office' and we're done), but I don't see an equally well-designed alternative without using such class if someone knows, please reply :-) -- Wouter Zoons - [EMAIL PROTECTED] http://www.andromda.org/ _________________________________________________________ Reply to the post : http://galaxy.andromda.org/forum/viewtopic.php?p=1394#1394 Posting to http://forum.andromda.org/ is preferred over posting to the mailing list! ------------------------------------------------------- SF.Net email is sponsored by: Discover Easy Linux Migration Strategies from IBM. Find simple to follow Roadmaps, straightforward articles, informative Webcasts and more! Get everything you need to get up to speed, fast. http://ads.osdn.com/?ad_id=7477&alloc_id=16492&op=click _______________________________________________ Andromda-user mailing list Andromda-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/andromda-user
