Compatibility with Rails 7

[wxw-matt]

How to reproduce

Using Docker image:

docker run --rm -it ghcr.io/flavorjones/truffleruby:nightly-slim bash
# In the shell inside the container:
apt-get update
apt-get install xz-utils git libpq-dev libsqlite3-dev -y
gem install nokogiri --platform=ruby
gem install rails
rails new blog 
rails g scaffold comment2 title:string content:string

You will get the error:

      invoke  active_record
      create    db/migrate/20220302010737_create_comment2s.rb
      create    app/models/comment2.rb
      invoke    test_unit
      create      test/models/comment2_test.rb
      create      test/fixtures/comment2s.yml
      invoke  resource_route
       route    resources :comment2s
      invoke  scaffold_controller
/usr/local/bundle/gems/jbuilder-2.11.5/lib/generators/rails/templates/controller.rb:11:in `block (3 levels) in <unused>': undefined method `all' for ActiveModel:Module (NoMethodError)

[eregon]

Thanks for the report, Rails 5 & 6 work (tested here), but we didn't test Rails 7 yet.

gem install nokogiri --platform=ruby should be unnecessary (it'll be installed by bundler later on if needed), why is that done?

@bjfish Could you investigate?
I would try to repro outside Docker for convenience.

[bjfish]

I think this is a smaller reproduction case:

module ActiveRecord
end
module Generators
end
module ActiveModel
end

p Object.const_get("ActiveRecord::Generators::ActiveModel")

Actual

ActiveModel

Expected

in `const_get': uninitialized constant ActiveRecord::Generators (NameError)

See:

truffleruby/src/main/ruby/truffleruby/core/module.rb

Lines 118 to 124 in f4ab861

	names.each do |s|
	if Primitive.object_kind_of?(res, Module)
	res = res.const_get(s, inherit)
	else
	raise TypeError, "#{name} does not refer to a class/module"
	end
	end

[bjfish]

@wxw-matt This issue is now fixed at 1c888c9. Thanks.

[wxw-matt]

@bjfish Thank you all very much. Just wondering if the patch is available in the nightly built Docker image?
Will have a tutorial about Truffleruby and latest Rails 7.
Anyway, I will try it now.

[eregon]

@wxw-matt As long as the build at https://github.com/flavorjones/truffleruby/pkgs/container/truffleruby is after 1c888c9 it should be fine (not the case yet, needs ~4 hours more).

[wxw-matt]

Thanks @eregon. Yeah, the current image does not have this patch. Waiting for the latest Docker image built with this fix.