dot gem causes error in CASino

[mmalek-sa]

I added CASino v3.0.0.pre.2 to an existing web application and encountered following error:

 ActionController::RoutingError (uninitialized constant CASino::SessionsHelper):
 /Users/mani/Projects/CASino/app/controllers/casino/sessions_controller.rb:2:in    `<class:SessionsController>'
 /Users/mani/Projects/CASino/app/controllers/casino/sessions_controller.rb:1:in `<top (required)>'
 activesupport (4.1.0) lib/active_support/inflector/methods.rb:240:in `const_get'
 activesupport (4.1.0) lib/active_support/inflector/methods.rb:240:in `block in constantize'
 activesupport (4.1.0) lib/active_support/inflector/methods.rb:236:in `each'
 activesupport (4.1.0) lib/active_support/inflector/methods.rb:236:in `inject'
 activesupport (4.1.0) lib/active_support/inflector/methods.rb:236:in `constantize'
 actionpack (4.1.0) lib/action_dispatch/routing/route_set.rb:76:in `controller_reference'
 actionpack (4.1.0) lib/action_dispatch/routing/route_set.rb:66:in `controller'
 actionpack (4.1.0) lib/action_dispatch/routing/route_set.rb:44:in `call'
 actionpack (4.1.0) lib/action_dispatch/journey/router.rb:71:in `block in call'
 actionpack (4.1.0) lib/action_dispatch/journey/router.rb:59:in `each'
 actionpack (4.1.0) lib/action_dispatch/journey/router.rb:59:in `call'

after lots of try and error I found the cause of error in my Gemfile:

group :development, :test do
   gem 'rspec-rails'

   # Use railroad for generating model diagrams
    gem 'railroady'

    # Use dot for generating diagrams via RailRoady
    gem 'dot'
end

commenting dot gem solved the problem!

   #gem 'dot'

Any Idea?

[pencil]

My best guess is that dot's String monkey patches are not compatible with the ActiveSupport monkey patches.