Question

以下使用合并的代码生成下面的SQL。我用粗体标记了我想要改变的操作符。

   Micropost.from_users_followed_by(self).merge(
    Micropost.direct_replies_to(self))

SELECT＆＃34; microposts＆＃34;。* FROM＆＃34; microposts＆＃34;在哪里＆＃34;微博＆＃34;。＆＃34;回复_＆＃34; =＆＃39;示例-1＆＃39; AND （user_id IN（SELECT followed_id FROM relationships WHERE follower_id = 2）AND user_id = 2）ORDER BY microposts.created_at DESC

什么方法在两者之间产生OR运算符？即：

SELECT＆＃34; microposts＆＃34;。* FROM＆＃34; microposts＆＃34;在哪里＆＃34;微博＆＃34;。＆＃34;回复_＆＃34; =＆＃39;示例-1＆＃39; OR （user_id IN（SELECT followed_id FROM relationships WHERE follower_id = 2）AND user_id = 2）ORDER BY microposts.created_at DESC

Answer 1

对一列值的OR运算符，可以将数组传递给Where子句，使用ActiveRecord使用IN（value1，value2）：

一列 Micropost.where(:reply_to => ["value1", "value2"])

了解更多专栏 Micropost.where("reply_to = ? or follower_id = ?", 'example-1', 2)

或试试这个

Micropost.where("(reply_to = 'example-1') or (another_condition))

Object.merge在SQL查询中创建AND - 什么方法创建OR？

1 个答案: