http://www.ideablade.com/forum/ This is an XML content feed of; DevForce Community Forum : DevForce 2009 : Link to Object with Multiple Subclasses Tue, 28 Apr 2026 00:16:05 -700 Fri, 17 Oct 2008 09:44:26 -700 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 9.69 360 www.ideablade.com/forum/RSS_post_feed.asp?TID=968 http://www.ideablade.com/forum/forum_images/IdeaBlade_logo_tm.png http://www.ideablade.com/forum/ http://www.ideablade.com/forum/forum_posts.asp?TID=968&PID=3504#3504 Author: danielp37
Subject: 968
Posted: 17-Oct-2008 at 9:44am

I have an abstract Agreement object with many subclasses (MemberAgreement, InvestmentAgreement, etc)

I have another object that links directly to one of these Agreements but the agreement might be of any of those types or may not exist at all because it hasn't been set yet.

Normally when navigating to a link that does not exist a null entity would be returned but in this case the Agreement base class is abstract since in practice we would never have an instance of agreement but I am getting an error when traversing the link because it can't create an instance of an abstract class (which I assume is occurring when it is trying to create the null entity for Agreement). 

This isn't a huge issue to me at the moment as I can code around this but I just thought it was an interesting issue.
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