Add option to name GSI properties and support string/number types #343
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This PR adds support for configuring the GSI properties (if necessary) in a controlled way.
Two use cases I have are:
supporting well named keys as per standards according to wider dev team (not my choice), it also tackles the discussion here: Database/dynamodb-single-table : Fine-grained GSI configuration #76 about fine grained control of the keys
I need to support numeric GSI's, this is because I want to use update expressions to do
ADD/SUBTRACTwithout having to read out the record, then perform a round trip (and potential race condition) for subsequent writes.If this PR goes against any sort of standards for property definitions but you like it then just let me know what I need to do to improve this please. Duplicating the GSI-X-YY multiple times for the enum looks dirty, would be happy to just make that "string" but considered that it can be correctly schema'd so left it in.