Support rails 6.1, ruby 2.7, ruby 3.0

[rewritten]

Better implementation of #76, that solves #75.

• Several methods that assumed errors is a mutable array now fork behavior depending on the ActiveModel version.
• Explicitly use kwargs splat in method_missing in Scopes
• Wrap scope again when ruby 3.0 unwraps it (by calling array methods for instance)

References:

https://rubyreferences.github.io/rubychanges/3.0.html#array-always-returning-array

On custom classes inherited from Array, some methods previously were returning an instance of this class, and others returned Array. Now they all do the latter.

https://rubyreferences.github.io/rubychanges/2.7.html#keyword-argument-related-changes

Empty hash splat doesn’t pass empty hash as a positional argument.

https://github.com/rails/rails/blob/6-1-stable/activemodel/CHANGELOG.md

The ActiveModel’s errors collection is now an array of these Error objects, instead of messages/details hash.

[pyromaniac]

it looks like you haven't run appraisals generate. Can you please add all the version defined here to the CI and regenerate all the gemfiles?

[rewritten]

I'm not sure about the meaning of the question. The gemfile for 6.1.0 is in the expected folder.

[rewritten]

I see what you mean @pyromaniac. Git is wrongly assuming there is a rename+change from the 4.2 gemfile to the 6.1 gemfile. But it really is a completely new file, the gemfiles for 4.2 to 5.2 were removed to be able to merge into toptal/active_data fork that relies on a different CI. I'll restore the previous changes so it will be clearer.

[pyromaniac]

Hm, CI doesn't run. Can you make it work or tell me if you run all the rails versions locally? I think GH actions would be just fine. I can do it as well over the weekend.

[ojab]

https://app.travis-ci.com/github/pyromaniac/active_data

We are unable to start your build at this time. You exceeded the number of users allowed for your plan. Please review your plan details and follow the steps to resolution.

That's awesome, looks like travis wants everyone to migrate to GHA for real.
#78

[pyromaniac]

So if you rebase, I'll manage to merge it right away I believe.

[rewritten]

So this can be closed already, right?

[ojab]

Yep, I included it into #80 with minor fixes.