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From: "Marcin Skladaniec" <marcin@ish.com.au>
Subject: nested contexts
To: user@cayenne.apache.org
Date: Tue, 13 Jan 2009 15:30:04 +1000
Message-ID: <web-4351901@ish.com.au>
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Hi

I have tried to use the nested contexts today. I tried a 
very simple thing, creating two objects one in the parent 
one in the child context, then linking them together:

ObjectContext aContext = ContextManager.getNewContext();
ObjectContext childContext = 
aContext.createChildContext();

Site site = aContext.newObject(Site.class);
Room room = childContext.newObject(Room.class);

r.setSite(s);


the last line throws exception:
  [java] org.apache.cayenne.CayenneRuntimeException: 
[v.3.0-SNAPSHOT ${project.build.date} 
${project.build.time}] Cannot set object as destination of 
relationship site because it is in a different 
ObjectContext
      [java] 	at 
org.apache.cayenne.CayenneDataObject.willConnect(CayenneDataObject.java:338)
      [java] 	at 
org.apache.cayenne.CayenneDataObject.setToOneTarget(CayenneDataObject.java:292)
      [java] 	at 
ish.oncourse.server.cayenne.glue._Room.setSite(_Room.java:135)
...rest of stack trace is not important

I think it is a bug, and relating objects should be 
allowed between parent/child contexts.

Another thing is that the 
http://cayenne.apache.org/doc/nested-datacontexts.html 
states that nested contexts are not available in ROP, is 
that still?

All best
Marcin