Hi: Has anyone figured out the use of generated long id in @PrinaryKey to build a complete key graph. If not possible, what is the best technique to generate long id for a complete graph of parent-child relationship. Following is a use case:
UserOrg is the root entity with userId = "f...@budhnet.com" which generate a 'message' sent to a list of receivers. public class UserOrg { @PrimaryKey private Key rootKey; // the key is generated as rootKey = KeyFactory.createdKey(UserOrg.class.getSimpleName(), userId); public class Message { //whose instance is generated by a userId @PrimaryKey private Key messageKey; // can the key be generated as one of the 2 followings messageKey = new KeyFactory.Builder(UserOrg.class.getSimpleName(), userId).addChild(Message.class.getSimpleName(), messageKey.getId ()).getKey(); or Key rootKey = KeyFactory.createKey(UserOrg.class.getSimpleName(), userId); messageKey = KeyFactory.createKey(rootKey, MessageClass.getSimpleName (), rootKey.getChild().getId()); If not, what is the best practice in generating the long id for child message of a userId. Same thing would apply for the MessageIndex of receiver list. public class MessageIndex { // child of the message created by userId Key rootKey = KeyFactory.createKey(UserOrg.class.getSimpleName(), userId); messageKey = KeyFactory.createKey(rootKey, MessageClass.getSimpleName (), rootKey.getChild().getId()); @PrimaryKey private Key messageIndexKey; messageIndexKey = KeyFactory.createKey(messageKey, MessageIndex.class.getSimpleName(), messageKey.getChild().getId()); The exercise is getting more complex for set intersection as shown in python in http://code.google.com/events/io/2009/sessions/BuildingScalableComplexApps.html Has anyone worked out the Java code of the demos? the author? Thanks Duong BaTien DBGROUPS and BudhNet
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