包含OR的where子句的活动记录中的正确语法
[英]Proper syntax in active record for where clause that contains an OR
问题描述
Can anyone tell me the proper syntax for the following? 
谁能告诉我以下的正确语法？
User.where(id_a: 2 OR id_b: 2).count
I'm trying to find the total number of users with either an id_a of 2 an or id_b of 2, but everything I try returns some error. 我试图找到id_a为2 an或id_b为2的用户总数，但我尝试的所有内容都会返回一些错误。
2 个解决方案
解决方案1
3 已采纳
User.where("id_a = ? OR id_b = ?", 2, 2).count
解决方案2
0 2015-01-12 04:23:21
If you don't want to repeat the same parameter 2 times and if the ? 如果你不想重复相同的参数2次，如果? makes you dizzy :), you can use the elegant "placeholder conditions" syntax described here (see section 2.2.1) as follows: 让你晕眩:)，你可以使用这里描述的优雅的“占位符条件”语法（参见第2.2.1节），如下所示：
User.where("id_a = :user_id OR id_b = :user_id", user_id: 2).count
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