singular_class_name -> dom_class

Enviroment: Rails 3.2 Ruby 1.9.2

showhide_helper.rb

line 81

solution:

from:
def normalize_class_name object

  if object.kind_of?(ActiveRecord::Base)
    ActionController::RecordIdentifier.singular_class_name(object)
  else
    object.to_s
  end

end

to:
def normalize_class_name object

  if object.kind_of?(ActiveRecord::Base)
    ActionController::RecordIdentifier.dom_class(object)
  else
    object.to_s
  end
end