handle ruby 3.x keyword arguments delegation

[rcugut]

This adds code compatibility with ruby 3.x changes in regard the delegation of positional splat arguments.

More info in the official ruby blog post explaining this change:
https://www.ruby-lang.org/en/news/2019/12/12/separation-of-positional-and-keyword-arguments-in-ruby-3-0/

The existing code breaks for ruby 3.x:

ArgumentError: wrong number of arguments (given 3, expected 1..2)
# ./gems/activerecord-6.1.4.4/lib/active_record/associations.rb:1457:in `has_many'
# ./lib/polymorphic_integer_type/extensions.rb:90:in `has_many'

I tested (locally) and the code changes are backward compatible for ruby 2.6 and 2.7.

[rcugut]

PS: I see the CI Github Actions setup is "hardcoded" to use ruby 2.6

polymorphic_integer_type/.github/workflows/ci.yml

Lines 26 to 29 in d27d276

	- name: Set up Ruby
	uses: ruby/setup-ruby@v1
	with:
	ruby-version: "2.6"

[olegantonyan]

Thank you @rcugut This already works in production, but I also had to change few things to make make it work in Rails 7. Hope this will be merged soon

[rcugut]

Thank you @rcugut This already works in production, but I also had to change few things to make make it work in Rails 7. Hope this will be merged soon

Thank you @olegantonyan

I just updated to Rail 7 too, and I had to only change the gemspec to for activerecord 7, and it works.

I'll watch for an update and use the published gem when you push it. Thank you

[olegantonyan]

If only I was a contributor here, he-he :)
For Rails 7 I've changed this olegantonyan@c01f473 b/c otherwise it broke non-integer polymorphic association. Also, it doesn't work with STI (when has_many points to model using STI). It's not crucial for me, but maybe someone is already working on proper fix for this