Mongo:如果有任何数组位置与单个查询匹配

问题描述

假定此数据结构:

{
    "title": "Foo bar",
    "username": "jackwreid"
},
{
    "title": "Bish bosh",
    "username": "lizziebump"
},
{
    "title": "Ham nam",
    "username": "lizziebump"
},
{
    "title": "Blub blub",
    "username": "jvarn"
}

并假设

var userFollowing = ["lizziebump", "jackwreid"]

对于用户名与userFollowing数组的任何内容匹配的帖子，我该如何做db.posts.find()?

How would I do a db.posts.find() for posts where the username matches any of the contents of the userFollowing array?

我正在尝试构建一个查询，该查询返回当前用户的以下列表中用户的帖子，并且我只能找到有关如何执行此操作的文档，如果单个查询字符串中包含单个查询字符串，则该方法将以其他方式围绕该查询返回帖子数组位置.

I'm trying to build a query that returns posts by users in the current user's following list and I can only find docs on how to do this the other way around where the query returns posts if a single query string is in any array position.

推荐答案

您可以使用 $in 运算符

You can use the $in operator

db.collection.find({username: {$in: userFollowing}})

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