Question

我在聚合中使用match来返回任何具有匹配元素的文档，这些元素具有嵌入式数组和另一个数组。一个例子：

文档

    {
        name: "Frank",
        favoriteColors: ["red", "pink", "orange"]
    }
    
    {
        name: "Bob",
        favoriteColors: ["blue", "red", "green"]
    }

数组

    let colors = ["blue", "maroon"];

因此，基本上，我想找到每个人（文档）最喜欢的颜色是蓝色或栗色的

Answer 1

使用$in运算符过滤一系列值。

插入脚本-

db.collection.insertMany([
{
    "name": "Frank",
    "favoriteColors": ["red", "pink", "orange"]
},
{
    "name": "Bob",
    "favoriteColors": ["blue", "red", "green"]
}]);

查询-

var query = {
    favoriteColors: {
        $in: ["blue", "maroon"]
    }
};

db.collection.find(query);

输出-

/* 1 */
{
    "_id" : ObjectId("5f12a14db00513b7c6ab6203"),
    "name" : "Bob",
    "favoriteColors" : [ 
        "blue", 
        "red", 
        "green"
    ]
}

Answer 2

类似这样的东西：

db.myCollection.find({ favoriteColors: { $in: ["blue", "maroon"] } })

您可以在此处找到更多文档 https://docs.mongodb.com/manual/reference/operator/query/in/#use-the-in-operator-to-match-values-in-an-array

查找在数组之间具有匹配元素的文档

2 个答案: