When enum defined in Rails6 model with Int8 and mapper in model like:

[trumenov]

When enum defined in Rails6 model with Int8 and mapper in model like: enum kind: { manual: 0, automated: 1, mixed: 2 }, _prefix: true

In this case, the default edit form loses model current value.

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[spohlenz]

This does indeed appear to be backwards in its current form. I'm not sure how it ended up that way, although I suspect it is due to my own over-reliance on string-backed enums.

I've fixed this in 55963f5 -- the fix was part of what you had -- to simply to use the enum key/label instead of the value/index as the checkbox value. The other changes within the form builder I don't believe are necessary though.

Could you confirm this solves the issue for you?