I know all details about how entity groups work in GAE's storage, but yesterday (at the App Engine meetup in Palo Alto), as a presenter was explaining his use of entity groups, it struck me that I've never really made use of them in my own GAE apps, and I don't recall seeing them used in open-source GAE apps I've used. So, I suspect I'v...
Hi, I am trying to wrap my head around Entity Groups in Google AppEngine. I understand them in general, but since it sounds like you can not change the relationships once the object is created AND I have a big data migration to do, I want to try to get it right the first time. I am making an Art site where members can sign up as regul...
UPDATE: After further testing, it seems this issue affects all child entities in my entity group. My root parent for all these different instances is User kind, which is my own creation, not the built in User kind. After removing the parent=user from the constructor of the child Kind, the get_by_key_name works as expected. However, I wou...
I am building an app based on google app engine (Java) using JDO for persistence. Can someone give me an example or a point me to some code which shows persisting of multiple entities (of same type) using javax.jdo.PersistenceManager.makePersistentAll() within a transaction. Basically I need to understand how to put multiple entites i...
Short question: Is the parent of an entity group included in that entity group (i.e. can a transaction affect the parent of an entity as well as the entity itself)? Thanks. ...