java - KeyFactory.createKey() Is this the correct way of storing data in Datastore -

each user can have many questions. questions can have 1 user. following correct

key questionkey = keyfactory.createkey("questions", userid); entity questionentity = new entity("question", questionkey); questionentity.setproperty("questioncategory", questioncategory); ... 

the given usage wrong. question, creating key using kind , userid . implies corresponding entity of kind="questions" , id=userid , no parents. wrong , start getting errors once have more 1 question user have same key.

ideally need question entity, declare kind question , parent user follows :

1, if using manually generated id or name question , :

key questionkey = keyfactory.createkey(userkey, "questions", questionidorname); 

2, if using app engine's auto generate id, no need create key, instead create entity as:

entity questionentity = new entity("questions",       userkey) 

here userkey key of user entity