Legal key names: key must not contain '.'

[Alex]

We have a MongoDB database, apparently having documents (or sub-documents) with keys that were combination of IP addresses and something else. We used to get error messages like "key xxxx must not contain '.'" with older version (1.1.x) of mongo db ruby driver (specifically bson and bson_ext), but we don't have such problem with later version (1.4.x and 1.5.x). Recently we want to update our gems to use the latest mongodb ruby driver (version 1.7.0), and the old problem comes back. To use the newer version of mongodb ruby drive, we had to scan all keys of documents to ensure such characters are swapped before saving and after receiving documents. Does any of you know the real difference between bson 1.4 and 1.7 that leads to such different behavior? Would it be more efficient to do such serializing/deserializing job using native c code?

Thanks,

Alex

[Sam Millman]

Personally I would say that any fieldname with a .or $ should be avoided. it creates confusion for the querier to understand the difference between a update modifier and a document field.

I would store, as most people do, IPs in integer format.

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