通过节点js中的mongoose将一个集合的相同值更改为期望值

Question

我在Nodejs中有一个使用mongoose的应用程序。 我有一个集合，在每个15个记录的一个字段中保存相同的值，但这个值是我之前创建的一个长字符串。 现在我希望每15张照片将这些字段值（长字符串）更改为1..n之类的增量数字：

'qwerasdfzxcvqwerasdfzxcv' => '1',
'qwerasdfzxcvqwerasdfzxcv' => '1',
(13 more records)...
'qazwsxedcrfvtgbyhnuhnujm' => '2',
'qazwsxedcrfvtgbyhnuhnujm' => '2',
(13 more records)...

MongoDB的JSON结果：

[{"ID":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOjE5LCJpYXQiOjE1MjQwMDgzOTl9.2YvhnXtCD7-fm4B14k10m6NF7xuv7moCTbekVekkbvY","category":"Wasp","photo":"A_wasp_565","description":"","answer":"Bee","__v":0},{"ID":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOjE5LCJpYXQiOjE1MjQwMDgzOTl9.2YvhnXtCD7-fm4B14k10m6NF7xuv7moCTbekVekkbvY","category":"Wasp","photo":"A_Pompilid_wasp_007","description":"","answer":"Wasp","__v":0},{"ID":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOjE5LCJpYXQiOjE1MjQwMDgzOTl9.2YvhnXtCD7-fm4B14k10m6NF7xuv7moCTbekVekkbvY","category":"Wasp","photo":"wasp_248","description":"","answer":"Wasp","__v":0},...,{"ID":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOjE5LCJpYXQiOjE1MjQwMDgzOTl9.2YvhnXtCD7-fm4B14k10m6NF7xuv7moCTbekVekkbvY","category":"Wasp","photo":"A_wasp_555","description":"","answer":"Moth/Butterfly","__v":0},{"ID":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOjE5LCJpYXQiOjE1MjQxMTYzNzJ9.jTQ06D5nw_xuCP0q0GVzaMmi3XipeNsf_RX5tAzenh8","category":"Wasp","photo":"A_wasp_565","description":"","answer":"Wasp","__v":0},{"ID":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOjE5LCJpYXQiOjE1MjQxMTYzNzJ9.jTQ06D5nw_xuCP0q0GVzaMmi3XipeNsf_RX5tAzenh8","category":"Wasp","photo":"A_Pompilid_wasp_007","description":"","answer":"Wasp","__v":0},{"ID":"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJfaWQiOjE5LCJpYXQiOjE1MjQxMTYzNzJ9.jTQ06D5nw_xuCP0q0GVzaMmi3XipeNsf_RX5tAzenh8","category":"Wasp","photo":"A_wasp_555","description":"","answer":"Wasp","__v":0}]}

我想在上面更新：

[{"ID":"1","category":"Wasp","photo":"A_wasp_565","description":"","answer":"Bee","__v":0},{"ID":"1","category":"Wasp","photo":"A_Pompilid_wasp_007","description":"","answer":"Wasp","__v":0},{"ID":"1","category":"Wasp","photo":"wasp_248","description":"","answer":"Wasp","__v":0},...,{"ID":"1","category":"Wasp","photo":"A_wasp_555","description":"","answer":"Moth/Butterfly","__v":0},{"ID":"2","category":"Wasp","photo":"A_wasp_565","description":"","answer":"Wasp","__v":0},{"ID":"2","category":"Wasp","photo":"A_Pompilid_wasp_007","description":"","answer":"Wasp","__v":0},{"ID":"2","category":"Wasp","photo":"A_wasp_555","description":"","answer":"Wasp","__v":0}]}

通过这种方式，所有这15条记录（已经具有相同的值但很长）将具有相同的数字但是可读的值，而不是长字符串。

我的问题是如何进行查询呢？ （mongoose命令）

这是节点中的模型模块（ID是我要更改的字段）：

var Schema = mongoose.Schema;

var SurveyAnswersSchema = new Schema({
_id: {type: String},
ID: {type: String},
answer: { type: String},
description: {type: String},
category: { type: String, enum: ['Bee', 'Beetle', 'Fly', 'Moth/Butterfly', 'Wasp' ] },
});

module.exports = mongoose.model('surveyanswers', SurveyAnswersSchema);

我应该在这写什么？ （控制器模块）

var SurveyResults = require('../models/surveyResults');

module.exports.reportAnswers = function (callback) {

     **// instead of this line what should I write?**
      SurveyResults.find({ID: 'this.ID'},{ID: number}, callback);
};

感谢您的帮助。

Answer 1

我已经解决了这个问题。 这是我的代码。也许对某人有用：

app.get('/surveyResultsUpdate', function(req, res, next){

    surveyResults.surveyResultsUpdate(function(err, answers){
        if (err)
        return next(err);

    var num =0;
    var resultsIdSet = new Set();
    answers.forEach(function(answer) {
         resultsIdSet.add(answer.Id);        
    });

    var newResults = answers; 

    var user_answer_dict = new Map();

    var counter = 0;
    for (var Id of resultsIdSet){
        num += 1;
        for ( var j in newResults) {
                if (Id === newResults[j].Id){
                    counter+=1;
                    user_answer_dict.set(counter, newResults[j]);

                    newResults[j]._id = answers[j]._id;
                    newResults[j].Id = num;
                    newResults[j].answer = answers[j].answer;
                    newResults[j].photo = answers[j].photo;
                    newResults[j].description = answers[j].description;
                    newResults[j].category = answers[j].category;
                }
            }
        }
        res.json(newResults);
    });
});

结果：