Ruby 2.1.0 support

[philrosenstein]

I've upgraded my Rails 2.3.18 app to work with Ruby 2.1.0 ( requires a couple monkey patches described here http://djellemah.com/blog/2013/02/27/rails-23-with-ruby-20/ )

json_builder templates are now throwing the following error:

undefined method json_builder_member_path for #<ActionView::Base
../gems/actionpack-2.3.18/lib/action_controller/polymorphic_routes.rb:107:in polymorphic_url
../gems/actionpack-2.3.18/lib/action_controller/polymorphic_routes.rb:114:in polymorphic_path
../gems/actionpack-2.3.18/lib/action_view/helpers/url_helper.rb:91:in url_for
../gems/actionpack-2.3.18/lib/action_view/helpers/url_helper.rb:228:in link_to
../gems/json_builder-3.1.7/lib/json_builder/compiler.rb:85:in method_missing
...

Is there a known issue with json_builder with Ruby 2? I don't think it's the monkey patches because it still works using the same patches with Ruby 1.9.3

[philrosenstein]

the above seemed to be cause by a link_to in the json builder template. By getting rid of the link to only attempting to use a url helper, I encounter the same error described by this closed issue:
#6
JSON::ParserError
unexpected token at '{"root_url": null, "username": "root_url": null,