I have discovered that I assumed that "Nullify" was default.
Reading the wiki page below, I miss an explanation of why "No action" is default or why "No action" exists at all. I would have preferred some default that either "did what I expected" or forced me to consider this problem and solve it upfront(the obvious cost being that one is forced to learn another concept upfront). Can "No action" be overridden by subclassing to do something reasonable? What worries me is that "No action" is a bug waiting to happen. It certainly bit me(I've screwed this up in three Cayenne projects before I learned of the the default delete rule). The precise behavior of "No action" is somewhat random. - Delete + commit => relationship might exists depending on how many objects are cached in Cayenne. - Delete + commit + logout(create new DataContext) => relationship no longer exists(same as above w/"Nullify") http://cwiki.apache.org/confluence/display/CAYDOC/Delete+Rules I was also somewhat surprised that validateForDelete() does not take the deleteRule="Deny" into account and that the exception only occurs when deleteObject() is invoked. -- Øyvind Harboe http://www.zylin.com
