require 'set' module ActiveModel module MassAssignmentSecurity class PermissionSet < Set def +(values) super(values.map(&:to_s)) end def include?(key) super(remove_multiparameter_id(key)) end def deny?(key) raise NotImplementedError, "#deny?(key) suppose to be overwritten" end protected def remove_multiparameter_id(key) key.to_s.gsub(/\(.+/, '') end end class WhiteList < PermissionSet def deny?(key) !include?(key) end end class BlackList < PermissionSet def deny?(key) include?(key) end end end end