we need to support string based keys, not just integer based ids

[dhermes]

It's quite common for developers to use string based keys rather than integer based keys. There needs to be a way for an EndpointsModel to incude the string based key over the wire.

Right now, _message_fields_schema can include 'id' in the list of fields, as a way to have integer based keys included on the wire. I suggest allowing 'string_id' and 'int_id'. Alternatively, perhaps one could specify 'key', which would cause an ndb.KeyProperty to be passed on the wire. This KeyProperty would contain either an int key or a str key.

_{NOTE: THIS POST WAS EDITED AFTER BEING MIGRATED.}

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author.htmlLink=https://code.google.com/u/fredsa/
author.name=fredsa
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published=2013-01-26T20:13:19.000Z}

_{Code Hosting Issue Metadata:
published=2013-01-26T20:13:19.000Z
stars=2
updated=2013-01-26T20:13:19.000Z
originalIssue=https://code.google.com/p/endpoints-proto-datastore/issues/detail?id=39
author=@fredsa
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[dhermes]

Closing as duplicate of #74