respond_to_missing?

# File activerecord/lib/active_record/attribute_methods.rb, line 465
      def respond_to_missing?(name, include_private = false)
        if self.class.define_attribute_methods
          # Some methods weren't defined yet.
          return true if self.class.method_defined?(name)
          return true if include_private && self.class.private_method_defined?(name)
        end

        super
      end