remove_attributes_protected_from_mass_assignment

# File activerecord/lib/active_record/base.rb, line 2533
      def remove_attributes_protected_from_mass_assignment(attributes)
        safe_attributes =
          if self.class.accessible_attributes.nil? && self.class.protected_attributes.nil?
            attributes.reject { |key, value| attributes_protected_by_default.include?(key.gsub(/\(.+/, "")) }
          elsif self.class.protected_attributes.nil?
            attributes.reject { |key, value| !self.class.accessible_attributes.include?(key.gsub(/\(.+/, "")) || attributes_protected_by_default.include?(key.gsub(/\(.+/, "")) }
          elsif self.class.accessible_attributes.nil?
            attributes.reject { |key, value| self.class.protected_attributes.include?(key.gsub(/\(.+/,"")) || attributes_protected_by_default.include?(key.gsub(/\(.+/, "")) }
          else
            raise "Declare either attr_protected or attr_accessible for #{self.class}, but not both."
          end

        removed_attributes = attributes.keys - safe_attributes.keys

        if removed_attributes.any?
          logger.debug "WARNING: Can't mass-assign these protected attributes: #{removed_attributes.join(', ')}"
        end

        safe_attributes
      end