使用活动记录搜索序列化数据 [英] Searching serialized data, using active record

问题描述

我正在尝试对序列化列进行简单查询，您是如何执行此操作的?

I'm trying to do a simple query of a serialized column, how do you do this?

serialize :mycode, Array


1.9.3p125 :026 > MyModel.find(104).mycode
  MyModel Load (0.6ms)  SELECT `mymodels`.* FROM `mymodels` WHERE `mymodels`.`id` = 104 LIMIT 1
 => [43565, 43402] 
1.9.3p125 :027 > MyModel.find_all_by_mycode("[43402]")
  MyModel Load (0.7ms)  SELECT `mymodels`.* FROM `mymodels` WHERE `mymodels`.`mycode` = '[43402]'
 => [] 
1.9.3p125 :028 > MyModel.find_all_by_mycode(43402)
  MyModel Load (1.2ms)  SELECT `mymodels`.* FROM `mymodels` WHERE `mymodels`.`mycode` = 43402
 => [] 
1.9.3p125 :029 > MyModel.find_all_by_mycode([43565, 43402])
  MyModel Load (1.1ms)  SELECT `mymodels`.* FROM `mymodels` WHERE `mymodels`.`mycode` IN (43565, 43402)
 => [] 

推荐答案

基本上，你不能.#serialize 的缺点是您绕过了数据库的本机抽象.您几乎只能加载和保存数据.

Basically, you can't. The downside of #serialize is that you're bypassing your database's native abstractions. You're pretty much limited to loading and saving the data.

也就是说，一种降低应用程序爬行速度的好方法可能是:

That said, one very good way to slow your application to a crawl could be:

MyModel.all.select { |m| m.mycode.include? 43402 }

故事的寓意:不要将#serialize 用于您需要查询的任何数据.

Moral of the story: don't use #serialize for any data you need to query on.

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