attr_ignore.rb

require "set"

module GitHub
  module AttrIgnore
    attr_reader :ignored_columns

    def attr_ignore(*columns)
      @ignored_columns ||= Set.new
      @ignored_columns |= columns.map(&:to_s)
    end

    def columns
      if ignored_columns
        super.reject { |column| ignored_columns.include?(column.name) }
      else
        super
      end
    end
  end
end

# use like:
#
#   class Spline < ActiveRecord::Base
#     extend GitHub::AttrIgnore
#     attr_ignore :reticulator_id
#   end
#