Controller (application.rb) 

 def flag

  render :partial =>'flag', :locals => { :controller_name => "2",
                                         @action_name     => params[:action_name] }
end

The partial _flag.rhtml 

2 should appear here: <%= controller_name %>

error 


  NameError in
  Sell#subject_selected





  Showing app/views/layouts/_flag.rhtml where line #2 raised:
  
undefined local variable or method `controller_name' for #<#<Class:0x4d83570>:0x4d83540>