为什么我的 MongoDB $or 查询不起作用?

本文介绍了为什么我的 MongoDB $or 查询不起作用?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在尝试执行$or"搜索以匹配两个正则表达式，如下所示:

I'm trying to perform an "$or" search to match of of two regular expressions as follows:

{ "metadata.text": { "$or": [ { "$regex": ".*hello.*" }, { "$regex": ".*world.*" } ] } }

我正在使用 mlab 并收到以下错误:

I'm using mlab and am receiving the following error:

MongoDB error: "Command failed with error 2: 'unknown operator: $or' on server ZZZZZZZ. The full response is { "ok" : 0.0, "errmsg" : "unknown operator: $or", "code" : 2, "codeName" : "BadValue" }." Please contact support@mlab if you need assistance.

为什么 $or 被检测为未知运算符?

Why is $or detected as an unknown operator?

推荐答案

只是因为 $or 应该是查询中的顶级运算符，如下所示:

Simply because $or should be a top level operator in your query, like this:

db.collection.find({ "$or": [ { "metadata.text": { "$regex": ".*hello.*" } }, { "metadata.text": { "$regex": ".*world.*" } } ] })