You're using an owned relationship, which means the parent's key is embedded in the keys of all the children. Thus, all children must have a parent in order to be persisted. You can either make a dummy group as Ian suggested, or use an unowned relationship and just store the key of the group with each child -- depending on the queries you need to make, this should be adequate. This will also be necessary if students are able to switch groups eventually since entity keys cannot be changed after they're persisted.
- Jason On Wed, Sep 16, 2009 at 6:42 AM, Arash <aras...@gmail.com> wrote: > > I have a one-to-many relationship, mapped as: > > @PrimaryKey > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) > @Extension(vendorName="datanucleus", key="gae.encoded-pk", > value="true") > private String key; > > @Persistent > private String name; > > @Persistent(nullValue= NullValue.NONE) > private Group parent; > > And in many side: > @Persistent(mappedBy= "parent") > private List<Student> children; > > I want to make the group property optional, but GAE refuses to save > any student entity which does not have group assigned to them. Do you > have any idea how I can fix it? > > > > --~--~---------~--~----~------------~-------~--~----~ 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 google-appengine-java@googlegroups.com To unsubscribe from this group, send email to google-appengine-java+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/google-appengine-java?hl=en -~----------~----~----~----~------~----~------~--~---
