By default, DataMapper creates Integer columns in the database for Enum properties (docs). If you store the 2nd value in the Enum's array, it stores a 2.
Is there a way to get it to use a true Enum column?
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Take a look at the sources of
Enum, copy/paste, and patch it accordingly. It should already overwrite all methods that are needed, so it shouldn't be too hard. Just remember that not all backends might support a trueEnumtype, but it should be good enough if you know yours does support it.