How to use ndb key with integer_id?

How to use ndb key with integer_id?

References

Reference NO 1

http://stackoverflow.com/questions/15187813/how-to-use-ndb-key-with-integer-id

Reference NO 2

https://developers.google.com/appengine/docs/python/ndb/keyclass

Reference NO 3

http://grokbase.com/t/gg/google-appengine/1334fhj9nt/how-to-use-ndb-key-with-integer-id

Reference NO 4

http://www.mail-archive.com/google-appengine@googlegroups.com/msg67281.html

Reference NO 5

http://code.google.com/p/appengine-ndb-experiment/source/browse/ndb/key.py?r=f598f99b6ddfa4b6a66708254ede5cedb264a0b8

Reference NO 6

http://appengine-ndb-experiment.googlecode.com/hg-history/r102/ndb/key.py

Reference NO 7

https://github.com/GoogleCloudPlatform/appengine-picturesque-python/blob/master/models.py

Reference NO 8

http://ravendb.net/docs/2.0/client-api/basic-operations/saving-new-document