Only had 5 days with MongoDB and I found it a good alternative for persistence of basic data structure in Python, my main concern was something that can $set individual elements of a JSON instead of retrieving the whole doc and modify it.
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Not quite sure what you mean, but Atomic Modifications might be what you want: http://www.mongodb.org/display/DOCS/Atomic+Operations
You can update any field in a document. Obviously you'll need the ID of the document.
> my main concern was something that can $set individual elements of a JSON instead of retrieving the whole doc and modify it.
i ran into the same question