使用update_all属性中的updated_at属性，乐观锁定是否可用于以下代码？

Question

产品型号可以由多个用户更新。但是，一次只有一个用户应该能够更新。为此，我想使用updated_at对产品模型使用乐观锁定。

我为乐观锁实现了以下代码。还有其他实现乐观锁定的方法，例如使用lock_version。但是，由于现有代码限制，我无法使用lock_version来实现。

  Product Model
  MAX_RETRIES = 3
  attr_writer :original_updated_at
  def original_updated_at
    @original_updated_at || updated_at
  end

  def stale_object?
    if self.updated_at > original_updated_at
      @original_updated_at = nil
      return true
    else
      return false
    end
  end

  def public_method
    ##code 
    result = nil
    begin
      result = private_method
      self.original_updated_at = self.updated_at
    rescue ActiveRecord::StaleObjectError => e
      errors.add(:base, ": Following records are changed while you were editing.")
      changes.except("updated_at").each do |name, values|
        errors.add(name, values)
      end
    rescue Exception => error
      ##code
    end
    result
  end



def private_method
    tries = 0
    begin
      raise ActiveRecord::StaleObjectError.new(self, "Product is changed while you were editing") if stale_object?
      attributes = #create hash using some code
      #some code

      attributes["updated_at"] = Time.now.utc
      Product.where(:id => self.id).update_all(attributes)
      self.original_updated_at = self.updated_at
    rescue ActiveRecord::StaleObjectError => e
      if tries < MAX_RETRIES
        tries += 1
        sleep(1 + tries)
        self.reload
        retry
      else
        raise ActiveRecord::StaleObjectError.new(self, "Product is changed while you were editing")
      end
    end
    attributes
  end