Because A is the entity group parent of B, the key of an instance of B must contain information about its entity group parent instance of A.
Instead of using b.key.getId() in // We cannot retrieve this object. Why? B newB = pm.getObjectById(B.class,b.key.getId()); you might care to use the KeyFactory.Builder class as detailed in "http://code.google.com/intl/en/appengine/docs/java/datastore/ creatinggettinganddeletingdata.html#Creating_and_Using_Keys" in order to build a key instance which contains information about both your B instance and its parental A instance. -- You received this message because you are subscribed to the Google Groups "Google App Engine for Java" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en.
