code: def weekdays_field(attribute, options={})
        db_field = options[:db_field] || attribute.to_s + '_bit_array'
        self.composed_of(attribute,
          :class_name => "::Timely::WeekDays",
          :mapping    => [[db_field, 'weekdays_int']],
          :converter  => Proc.new {|field| ::Timely::WeekDays.new(field)}
        )
      end
docs: Add a WeekDays attribute
  
   By default it will use attribute_bit_array as db field, but this can
   be overridden by specifying :db_field => 'somthing_else'