datetime integratable for ActiveRecord

datetime_integratable.rb

module DatetimeIntegratable
  extend ActiveSupport::Concern

  included do
    after_initialize :initialize_integrate_datetime

    def initialize_integrate_datetime
      self.class.datetime_integrate_targets.each do |attribute|
        decompose_datetime(attribute)
      end
    end

    def integrate_datetime(attribute)
      date = self.send("#{attribute}_date")
      hour = self.send("#{attribute}_hour")
      minute = self.send("#{attribute}_minute")
      second = self.send("#{attribute}_second")
      if date.present? && hour.present? && minute.present?
        self.send("#{attribute}=", "#{date} #{hour}:#{minute}:#{second.present? ? second : '00'}")
      else
        self.send("#{attribute}=", nil)
      end
    rescue
      nil
    end

    def decompose_datetime(attribute)
      return unless self.respond_to?("#{attribute}")
      original_date = self.send("#{attribute}")
      return if original_date.nil?
      [["date", "%Y/%m/%d"], ["hour", "%H"], ["minute", "%M"], ["second", "%S"]].each do |key, format|
        return if self.send("#{attribute}_#{key}").present?
        self.send("#{attribute}_#{key}=", original_date.strftime(format))
      end
    end
  end

  module ClassMethods
    attr_accessor :datetime_integrate_targets

    def integrate_datetime_fields(*attributes)
      self.datetime_integrate_targets = attributes
      attributes.each do |attribute|
        self.send(:attr_accessor, "#{attribute}_date")
        self.send(:attr_accessor, "#{attribute}_hour")
        self.send(:attr_accessor, "#{attribute}_minute")
        self.send(:attr_accessor, "#{attribute}_second")
        define_method("#{attribute}_date=") do |value|
          self.instance_variable_set("@#{attribute}_date", value)
          integrate_datetime(attribute)
          value
        end
        define_method("#{attribute}_hour=") do |value|
          self.instance_variable_set("@#{attribute}_hour", value)
          integrate_datetime(attribute)
          value
        end
        define_method("#{attribute}_minute=") do |value|
          self.instance_variable_set("@#{attribute}_minute", value)
          integrate_datetime(attribute)
          value
        end
        define_method("#{attribute}_second=") do |value|
          self.instance_variable_set("@#{attribute}_second", value)
          integrate_datetime(attribute)
          value
        end
        define_method("#{attribute}=") do |value|
          super value
          decompose_datetime(attribute)
          value
        end
      end
    end
  end
end