Ruby 3.0.0 compatibility

[ericproulx]

Just trying grape with ruby 3.0. I might have to update rubocop also

[anakinj]

Before you waste any time in investigating failures on CI, the failing test related to arrays and XMLs is addressed in #2144

[grape-bot]

	1 Warning
⚠️	Unless you’re refactoring existing code, please update CHANGELOG.md.

Here's an example of a CHANGELOG.md entry:

* [#2145](https://github.com/ruby-grape/grape/pull/2145): Try ruby 3 0 - [@ericproulx](https://github.com/ericproulx).

Generated by 🚫 danger

[ericproulx]

Fix #2142

[dblock]

We're moving to GH actions in #2143, which I just merged, update?

[anakinj]

This Danger failure is interesting. Think that Danger is not able to interact with it's old entires because it uses a different GitHub token than before. We could either live over the transitiontime or reuse the old token from TravisCI for the danger integration.

Maybe it also could work if a maintainer would delete the old danger entry created from the Travis run, ping @dblock

[ericproulx]

Most of the work is :

• Add { } or ** when needed
• Change ** by *

The last one is quite particular. For the middlewares, I figured that Rack::Builder is instantiating them like this

middleware.new(app, *args, &block)

It's the same within the Grape::Middleware::Stack. Therefore, I replace the **options by *options and shifting the first argument if any.

Same thing happened with the lib/grape/validations/validators/base.rb. When having and_call_original, the class is actually instantiated :

original.call(*args, &block)

I haven't figured how to make a call properly when having a double splat param with a .new(*args)

eproulx@laptop grape % irb      
irb(main):001:0> def test(app, **options); end
=> :test
irb(main):002:0> args = [:app, {opt: [1,2]}]
=> [:app, {:opt=>[1, 2]}]
irb(main):003:0> test(*args)
Traceback (most recent call last):
        5: from /Users/eproulx/.rbenv/versions/3.0.0/bin/irb:23:in `<main>'
        4: from /Users/eproulx/.rbenv/versions/3.0.0/bin/irb:23:in `load'
        3: from /Users/eproulx/.rbenv/versions/3.0.0/lib/ruby/gems/3.0.0/gems/irb-1.3.0/exe/irb:11:in `<top (required)>'
        2: from (irb):3:in `<main>'
        1: from (irb):1:in `test'
ArgumentError (wrong number of arguments (given 2, expected 1))

That's why I made theses changes

[ericproulx]

Instead of having **options we could go back to options = {} which will work.

[dblock]

I'm down with whatever solution. Can merge on green -needs a CHANGELOG. Looks like danger didn't rerun for the PR when it was updated? It should have picked up on the changelog. Did we configure this wrong?

[anakinj]

I'm down with whatever solution. Can merge on green -needs a CHANGELOG. Looks like danger didn't rerun for the PR when it was updated? It should have picked up on the changelog. Did we configure this wrong?

Check my previous comment, think its because the token for danger has changed and it cannpt interact with previous entries

[dblock]

I merged this, YOLO