It is not clear (to me) exactly what question you are asking. Are you asking if it is possible to change the parent of a datastore entity after it has been created? AFAIK, the answer is no, because the parent is an inherent part of the identity of the entity...which also cannot be changed. You have to create a new entity with the new parent, delete the old, and update all references to the old entity to point at the new one.
As far as your code example, many people (including myself) are not going to download and open a zip file from unknown sources. You will get a better response by including the smallest possible code snippet that shows exactly the problem you are trying to solve. Chris 2011/7/7 Sébastien Tromp <[email protected]>: > Hello, > I have already posted this e-mail on the general AppEngine google group, but > without any answer; so I assume it may be better suited in the AppEngine for > Java group. > ----------- > Hello, > First of all I'd like to apologize, because it seems that this question has > been asked several times already. I looked at them all, but unfortunately > couldn't find the answer to my issue. > I have put together the attached test case to illustrate my issue, but to > sum it up: > - I create a Player entity > - I create a Ranking entity > - I assign the Ranking to the Player > - I persist the player > And at that point the aforementioned exception is raised. > The attached test case contains all the details for the classes, and should > be self-sufficient provided the classpath is properly configured. > If, in my parent class (Player), when I set the child (Ranking), I do: > public void setRanking(final Ranking ranking) { > this.ranking = ranking; > ranking.setPlayer(this); > } > all tests seem to pass, except for the last one. And it really looks like a > hack to me, so I'm not sure that's the way to go. > I'd be glad to give any additional information I may have forgotten, or > pointers to the documentation that explains what I did wrong (there is > obviously something I'm not getting here). > Thanks in advance for your help, > -- > Seb > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine for Java" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/google-appengine-java/-/YIWXRkvgjs0J. > 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. > -- 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.
