And 3: can I assume that ids will be unique within an entity group and Kind, or are there no guarantees at all?
On Thu, Nov 18, 2010 at 9:23 PM, Riley <[email protected]> wrote: > I have a datastore full of entities. They are all in an entity group with > many other entities - maybe 1000 per group. I am using keys and parent keys > to keep them organized: > > @PersistenceCapable(detachable = "true") > public class Assessment > { > @SuppressWarnings("unused") > @Persistent > @Extension(vendorName = "datanucleus", key = "gae.parent-pk", value = > "true") > private Key parentKey; > > @PrimaryKey > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) > private Key key; > > ... > > > However, to communicate with the client, I've been using key.getId() to get > a numeric identifier. I've been assuming that each key would have a > different id, but have recently noticed that this is a bad assumption! Many > of my entities share an ID! Unfortunately, I noticed this just a couple of > days after opening my app to beta testers, so I have real data on the line. > > > 1: How can I ensure that every entity gets a unique id? Do I have to > implement my own id generator? > > 2: Now that I have many entities with the same id (but different keys) is > there any way to efficiently transmit something that uniquely identifies > each entity? > > Thanks for any help or advice! > > -- > You received this message because you are subscribed to the Google Groups > "Google App Engine" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]<google-appengine%[email protected]> > . > For more options, visit this group at > http://groups.google.com/group/google-appengine?hl=en. > -- You received this message because you are subscribed to the Google Groups "Google App Engine" 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?hl=en.
