raise_nil_warning_for

# File activesupport/lib/active_support/whiny_nil.rb, line 53
    def raise_nil_warning_for(class_name = nil, selector = nil, with_caller = nil)
      message = "You have a nil object when you didn't expect it!"
      message << "\nYou might have expected an instance of #{class_name}." if class_name
      message << "\nThe error occurred while evaluating nil.#{selector}" if selector

      raise NoMethodError, message, with_caller || caller
    end