It looks like you are looking for a complete JavaScript interface for model and query APIs. I cannot imagine that this would ever be done, or even be a simple task. Not only do you need to somehow generate JavaScript instances for the models (much more than JSON serialization, since you also need methods), but you will need to open a web service that can handle all kinds of DB-API calls. I can’t even imagine where to start, and the security problems can be too numerous to easily overcome.
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