Finally, I figured it out!
# rescue NoMethodError
def method_missing(method, *args, &block)
if method == 'class_breadcrumb'
flash.now["alert-danger"] = "You didn't provide a breadcrumb for #{request.fullpath}! Please send us a feedback including this message!"
render params[:action]
end
end
This is metaprogramming Ruby! That's why I've just convinced myself to buy this book and get the pain out: http://pragprog.com/book/ppmetr/metaprogramming-ruby