title: app engine ndb - how to load entity by key using id?
body: <p>I am trying to load an entity by key using the id it was assigned by the datastore but I don't see any api method to do this (using NDB).  I thought I would be able to make a Key from an integer id and use key.get() to load the entity, but I don't see a way to make a key from just an id.  I suspect I am missing something obvious here.  How should I load an entity where I only know the id of it?</p>