Question

以下是代码段

Wip.where(status: "P").where("reason NOT IN ?", ['DOB_MISSING'])

这不起作用。

我试过寻找它并发现了很多问题。他们中的一些人建议这样做，但我不确定我哪里出错了

这里我粘贴了一部分我的导轨c

[19] pry(main)> Wip.where(status: "P").where("reason NOT IN ?", ['DOB_MISSING']).count
   (0.6ms)  SELECT COUNT(*) FROM `wip` WHERE `wip`.`status` = 'P' AND (reason NOT IN 'DOB_MISSING')
ActiveRecord::StatementInvalid: Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''DOB_MISSING')' at line 1: SELECT COUNT(*) FROM `wip`  WHERE `wip`.`status` = 'P' AND (reason NOT IN 'DOB_MISSING')
from /home/ritu/.rvm/gems/ruby-2.2.3@svasth/gems/rack-mini-profiler-0.9.7/lib/patches/db/mysql2.rb:20:in `query'

Answer 1

这是一个简单的语法错误问题：

where("reason NOT IN (?)", ['DOB_MISSING'])

所有IN条款都需要用方括号括起来。

Answer 2

您也可以使用arel_table方法：

restrict_arr = ['DOB_MISSING']
Wip.where(status: "P").where(Wip.arel_table[:reason].not_in(restrict_arr))

如何不在rails 3中工作

2 个答案: