Dynamically create Error classes

error.rb

module SheetCRUD
  module Error

    ERRORS = [
      unauthorized: { message: 'Unauthorized.',      status: 401 },
      limit_exceed: { message: 'Rate limit exceed.', status: 429 },
      not_found:    { message: 'Not found.',         status: 404 }
    ]

    class StandardAPIError < StandardError
      attr_reader :status

      def initialize(message="Error.", status=500)
        @status = status
        super(message)
      end
    end

    ERRORS[0].each_pair do |klass_name, values|
      klass = Class.new(StandardAPIError) do
        define_method :initialize do |message = values[:message], status = values[:status]|
          super(message, status)
        end
      end

      Error.const_set(klass_name.to_s.camelize, klass)      
    end

  end
end