Question

My GWT+GAE app uses Requestfactroy entity locator and at the server side i use Objectify, it works well when my Entity ID type is String, now i want to change to Long id, and stuck: by using the locator signature i can not find the entity:

 @Override
    public T find( Class<? extends T> clazz, Long id )
    {
    }

Because Objectify requires @Parent key included to fetch the sub-entities(HRD), and from the method above we can not get the parent.
I found this thread from GWT forum:
here

However this thread seems didn’t give any constructive suggestions(it falls back to String ID Entity finally for the solution).

Many thanks.

Answer 1

The problem is that the long ID is not enough to identify your object. As you say, you also need its parent, so the ID is actually a compound ID: the parent object, and the child’s ID.

BTW, what’s the problem with using the keyToString or similar here? (as suggested on the thread you link to)
The ID from a Locator is only used on the server-side and only by the locator (and serialized as-is to be passed back and forth to/from the client; but they’re opaque things on the client-side, that you aren’t even given access).