# ActsAsBits
module ActiveRecord
  module Acts #:nodoc:
    module Bits #:nodoc:
      def self.included(base)
        base.extend(ClassMethods)
      end

      # Example:
      # acts_as_bits :flags, %w( admin composer )
      module ClassMethods
        def acts_as_bits(part_id, bit_names)
          composed_name = part_id.id2name
          bit_names.each_with_index do |name, index|
            module_eval <<-end_eval
              def #{name}
                #{composed_name}[#{index}] != ?0
              end
              alias #{name}? #{name}
              def #{name}=(v)
                #{composed_name}[#{index}] = v ? ?1 : ?0
              end
            end_eval
          end
        end
      end
    end
  end
end