Ohm::ActiveModelCompliant, allows to Ohm (Redis OHM) to be partially compliant with ActiveModel (except errors)

active_model_compliant.rb

require 'active_model'

module Ohm
  module ActiveModelCompliant
    def self.included(base)
      base.send(:extend, ActiveModel::Naming)
      base.send(:include, ActiveModel::Conversion)
      base.send(:include, InstanceMethods)
    end

    module InstanceMethods
      def to_key
        self.id rescue nil
      end

      def to_param
        self.id.to_s rescue nil
      end

      def persisted?
        !self.new?
      end
    end
  end
end