Fowardable and ActiveSupport clash in Rails 4.2

[Steven Fuchs]

Hello All

I have come across a problem, documented in the links below, when extending Fowardable in an app I am porting to Rails 4.2.1.

Any class that extends Forwardable (which used to work) now gives this error:

ArgumentError: wrong number of arguments calling `instance_delegate` (2 for 1)
            extended at /Users/steve/.rvm/gems/jruby-1.7.13/gems/activemodel-4.2.1/lib/active_model/naming.rb:220
            extend at org/jruby/RubyKernel.java:2200


The links have some suggestions which work in most cases. But I'm surprised there would be a conflict between those classes, both are in Rails core right? Am I the only person seeing this?

https://github.com/jayroh/thredded/commit/fd0787130fb1e7d0847c2b50b4b4797396d858dc
https://github.com/cequel/cequel/issues/193

Thanks in advance for any help.

Steve