Module: Norton::Timestamp::ClassMethods

Defined in:
lib/norton/timestamp.rb

Instance Method Summary collapse

Instance Method Details

#timestamp(name, options = {}) ⇒ type

timestamp Define a timestamp

Parameters:

  • name (type) —
    description
  • touches={} —
    type
    description

Returns:

  • (type) —
    description


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# File 'lib/norton/timestamp.rb', line 16

def timestamp(name, options={})
  register_norton_value(name, :timestamp)

  # Redis: GET
  define_method(name) do
    value = Norton.redis.with do |conn|
      raw_value = conn.get(norton_value_key(name))
      break raw_value if raw_value.present?

      send("#{name}_default_value").tap do |default_value|
        conn.set(norton_value_key(name), default_value)
      end
    end
    instance_variable_set("@#{name}", value.to_i)
  end

  define_method("#{name}_default_value") do
    return nil if options[:allow_nil]
    return (Time.current.to_f * 1000).to_i if options[:digits] == 13

    Time.current.to_i
  end

  # Redis: SET
  define_method("touch_#{name}") do
    value = options[:digits] == 13 ? (Time.current.to_f * 1000).to_i : Time.current.to_i

    Norton.redis.with do |conn|
      conn.set(norton_value_key(name), value)
    end
    instance_variable_set("@#{name}", value)
  end

  # Redis: DEL
  define_method("remove_#{name}") do
    Norton.redis.with do |conn|
      conn.del(norton_value_key(name))
    end
    remove_instance_variable("@#{name}") if instance_variable_defined?("@#{name}")
  end
  send(:after_destroy, "remove_#{name}".to_sym) if respond_to? :after_destroy

  # Add callback
  if options[:touch_on].present?
    options[:touch_on].each do |callback, condition|
      self.send callback, proc{ if instance_eval(&condition) then instance_eval("touch_#{name}") end }
    end
  end
end