Rails 6.1 v2

[kobsy]

Summary

This builds upon the work that Luke did in #7 but addresses some under-the-hood changes to ActiveRecord that took place between Rails 6.0 and Rails 6.1. It also moves CI from Travis (not running anymore without a config update) to GHA (which is free for open-source projects like this). 🙂

Closes #7

[kobsy]

It doesn't look like I can request a review, but would you mind giving it a look when you get the chance, @boblail? 🙂

[boblail]

LGTM

I've removed Travis from the required status checks in Branch Protection.

Should we consider this an alternative to #7? (It looks it doesn't just build on the other PR but squashes some commits too?)

[boblail]

I'd expect this to work — does it?

Suggested change

	before_rails61? ? :types : :klass
	ActiveRecord::VERSION < "6.1" ? :types : :klass

[kobsy]

That didn't work, but ActiveRecord.version < Gem::Version.new("6.1") did. 🙂

[kobsy]

Thanks for taking a look, @boblail. I updated the version check to be a little more elegant, per your suggestion.

This would be intended to supersede #7, as it makes a few additional changes to ensure the gem is Rails 6.1+ ready.