如何使用 Mongoose 更新给定另一个嵌套字段值的嵌套字段？

Question

我正在创建一个端点，该端点旨在更新之前已经回答过的问题的答案，但我无法访问我的 Mongoose 架构中的该字段。

我正在使用的架构响应此 JSON 示例：

{
    "pollId":15,
    "userId":13,
    "name":"poll name",
    "description":"poll desc.",
    "status":"poll status",
    "created":"2020-10-13",
    "modified":"2020-10-16",
    "sections":[
        {
            "sectionIndex":1,
            "sectionTitle":"section title",
            "sectionDescription":"section desc.",
            "questions":[
                {
                    "questionIndex":1,
                    "questionTitle":"quest. title ",
                    "questionType":"quest. type",
                    "value":"quest. answer", //<- This could be the field to update
                    "mandatory":true,
                    "multiline":false,
                    "adornment":"",
                    "restrictions":{"min":0,"max":10},
                    "options":[{"option":"option 1"},{"option":"option 2"},{"option":"option 3"}]
                },
                {
                    "questionIndex":2,
                    "questionTitle":"quest. title ",
                    "questionType":"quest. type",
                    "value":"quest. answer", //<- This could be the field to update
                    "mandatory":true,
                    "multiline":false,
                    "adornment":"",
                    "restrictions":{"min":0,"max":10},
                    "options":[{"option":"option 1"},{"option":"option 2"},{"option":"option 3"}]
                }]
        },
        {
            "sectionIndex":2,
            "sectionTitle":"section title",
            "sectionDescription":"section desc.",
            "questions":[
                {
                    "questionIndex":1,
                    "questionTitle":"quest. title ",
                    "questionType":"quest. type",
                    "value":"quest. answer", //<- This could be the field to update
                    "mandatory":true,
                    "multiline":false,
                    "adornment":"",
                    "restrictions":{"min":0,"max":10},
                    "options":[{"option":"option 1"},{"option":"option 2"},{"option":"option 3"}]
                },
                {
                    "questionIndex":2,
                    "questionTitle":"quest. title ",
                    "questionType":"quest. type",
                    "value":"quest. answer", //<- This could be the field to update
                    "mandatory":true,
                    "multiline":false,
                    "adornment":"",
                    "restrictions":{"min":0,"max":10},
                    "options":[{"option":"option 1"},{"option":"option 2"},{"option":"option 3"}]
                }
              ]
}

我想达到的效果：

在 sectionIndex:Y 部分的 questionIndex:X 问题上访问字段 value 并更新 value.

到目前为止我已经尝试过：

到目前为止，我在我的端点控制器上试过这个：

{
    let query = {pollId: req.body.pollId, sectionIndex: req.body.sectionIndex, questionIndex: req.body.questionIndex}
    pollSchema.findOneAndUpdate(query,{$set :{value: req.body.value}},{new:true},function(err)
    {
       res.status(200).send({message:"updated"});  
       (err)=>
        { 
            res.status(500).send(err);
            console.log(err);
        }
    
    });
}

但这似乎不起作用...

附加信息：

我正在使用 Postman 测试 enpoint 并将文档存储在 MongoDB Atlas 集群上。

如果您需要更多信息，请随时询问。提前致谢

Answer 1

好的，所以我设法弄明白了。

如果有人感兴趣我会留下答案

pollSchema.findOneAndUpdate(pollId: req.body.pollId, "sections.questions.questionIndex": req.body.questionIndex,{$set: {"sections.$[s].questions.$.value": req.body.value}},{arrayFilters: [{"s.sectionIndex": req.body.sectionIndex}]})

有关更多信息，请访问：

$ operator

$[]

$[< identifier >]

我建议您完整阅读这些文章，但您只需阅读这些超链接上的部分就会明白其中的意思

如何使用 Mongoose 更新给定另一个嵌套字段值的嵌套字段？

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javascript

mongoose

node.js

express

body-parser