Hi, If they don't belong to the same entity group, you will raise an exception by trying to store 2 objects in a single transaction.
2 ways to handle that: a) you make Mobile belong to same entity group as Person so you'll be able to store both in a single transaction. I understand in your question that you can't go this way. b) you store one let's say Person in first transaction and during this transaction, you start a task as part of the transaction: "You can enqueue a task as part of a datastore transaction, such that the task is only enqueued—and guaranteed to be enqueued—if the transaction is committed successfully. Tasks added within a transaction are considered to be a part of it and have the same level of isolation and consistency." as said in http://code.google.com/appengine/docs/java/taskqueue/overview.html#Tasks_Within_Transactions Hope it helps didier On Dec 15, 8:26 am, kartik kudada <kartik.kud...@gmail.com> wrote: > Can we store two unowned objects(one to many) in datastore in a single > transaction. > For example - We have > > public class Person { > @PrimaryKey > �...@persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) > private Long id; > > @Persistent > private String name; > > @Persistent > private List<Key> mobileIds = new ArrayList<Key>(); > > //.... > //..... > } > > public class Mobile { > > �...@primarykey > @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY) > private Key mobileId; > > // ... > //.... > > } > > I want to store these two objects in datastore in single transaction so that > relation can be made in between both objects. > Tell me if any other solution is there ? -- 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-j...@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.
