undefined method 'each_with_index' on Rails 5.0.3 with JRuby

[holgum]

Came across this issue when upgrading from Rails 4.2.8 to Rails 5.0.3 on JRuby 9.1.10.0.
Duplicated it from Rails console:

irb(main):006:0> s.add_row["Hello"]
NoMethodError: undefined method `each_with_index' for #<Axlsx::Row:0x72e36677>
Did you mean?  each_index
        from C:/bin/jruby-9.1.10.0/lib/ruby/gems/shared/bundler/gems/axlsx-776037c0fc79/lib/axlsx/workbook/worksheet/worksheet.rb:
781:in `update_column_info'
        from C:/bin/jruby-9.1.10.0/lib/ruby/gems/shared/bundler/gems/axlsx-776037c0fc79/lib/axlsx/workbook/worksheet/worksheet.rb:
446:in `add_row'
        from (irb):6:in `<eval>'
        from org/jruby/RubyKernel.java:1000:in `eval'
        from org/jruby/RubyKernel.java:1298:in `loop'
        from org/jruby/RubyKernel.java:1120:in `catch'
        from org/jruby/RubyKernel.java:1120:in `catch'
        from C:/bin/jruby-9.1.10.0/lib/ruby/gems/shared/gems/railties-5.0.3/lib/rails/commands/console.rb:65:in `start'
        from C:/bin/jruby-9.1.10.0/lib/ruby/gems/shared/gems/railties-5.0.3/lib/rails/commands/console_helper.rb:9:in `start'
        from C:/bin/jruby-9.1.10.0/lib/ruby/gems/shared/gems/railties-5.0.3/lib/rails/commands/commands_tasks.rb:78:in `console'
        from C:/bin/jruby-9.1.10.0/lib/ruby/gems/shared/gems/railties-5.0.3/lib/rails/commands/commands_tasks.rb:49:in `run_comman
d!'
        from C:/bin/jruby-9.1.10.0/lib/ruby/gems/shared/gems/railties-5.0.3/lib/rails/commands.rb:18:in `<main>'
        from org/jruby/RubyKernel.java:961:in `require'
        from bin/rails:4:in `<main>'

Swapped out JRuby for MRI 2.3.4 and problem disappeared.
My Gemfile (before and after Rails upgrade):

gem 'axlsx', git: 'https://github.com/randym/axlsx.git', ref: '776037c0fc799bb09da8c9ea47980bd3bf296874'
gem 'axlsx_rails'

Originally opened caxlsx/caxlsx_rails#83 but it seems like it comes from axlsx gem.

[straydogstudio]

I've confirmed that each_with_index does not come along with Array.instance_methods with newer versions of jRuby here:

axlsx/lib/axlsx/util/simple_typed_list.rb

Line 158 in d136835

DELEGATES = Array.instance_methods - self.instance_methods - DESTRUCTIVE

[straydogstudio]

Something else: Array.instance_methods contains each_with_index in plain irb. Only inside Rails 5 does it not show up. Now the question is if 5.1 is any different.

[straydogstudio]

Confirmed each_with_index is also missing in Rails 5.1, and present with MRI. Rails issue: rails/rails#29329

[straydogstudio]

For a given Rails app. In config/application.rb, right before the Bundler.require* statement, add this line:

Array.include Enumerable

This seems rather unnecessary. But it does work.