通过 nodejs 查询 mongodb 显示空结果？

Question

1.I 我正在尝试通过节点 below.js 在数据库 "teamautomation" 中查询集合 "radar_life_cycle"，如下所示

2.I创建了对应的模型，通过 mongoose 连接到 mongodb 成功，没有错误，但我得到一个空列表。

正如您从下面帖子的输出中看到的，[] 是一个空列表，但我可以看到数据库中有记录，任何人都可以提供有关这里可能出现的问题的指导吗？

app.js

const express = require("express");
const mongoose = require("mongoose");
const Radar_life_cycle = require("./models/radar_life_cycle");
const app = express();

mongoose
  .connect(
    "mongodb://username:password@1x.xxx.xxx.x:27017/wifiautomation"
  )
  .then(() => {
    console.log("Connected to database!");
  })
  .catch(() => {
    console.log("Connection failed!");
  });


app.get("/api/radars", (req, res, next) => {
 Radar_life_cycle.find({ orgRadar: "51918661" }).then(documents => {
    res.status(200).json({
      message: "Posts fetched successfully!",
      posts: documents
    });
  });
});

models/radar_life_cycle

const mongoose = require('mongoose');
const radar_life_cycle_Schema = mongoose.Schema({
    Delivered: String,
    orgRadar: String,
    root_build: String,
    inserted_by: String,
    milestone: String,
    applicable_chipsets: [String],
    project_tag: String,
    gerrits:String,
    inserted_on:Date,
    SDK:String
});

module.exports = mongoose.model('radar_life_cycle', radar_life_cycle_Schema);

输出：-

terminal$ nodemon server.js
[nodemon] 1.14.12
[nodemon] to restart at any time, enter `rs`
[nodemon] watching: *.*
[nodemon] starting `node server.js`
(node:17500) DeprecationWarning: current URL string parser is deprecated, and will be removed in a future version. To use the new parser, pass option { useNewUrlParser: true } to MongoClient.connect.
Connected to database!

{"message":"Posts fetched successfully!","posts":[]}

预期输出：-

{"message":"Posts fetched successfully!","posts":should include the corresponding records}

数据库文件截图：

Answer 1

app.get("/api/radars", (req, res, next) => {
 Radar_life_cycle.find({ orgRadar: "51918661" }).then(documents => {
    res.status(200).json({
      message: "Posts fetched successfully!",
      posts: documents[0]
    });
  });
});

find 方法在这种情况下查找数据库中的所有文档，似乎只有一个...如果有更多，您可以更新上面的代码并使用循环访问文档。

Answer 2

以这种方式尝试架构可能无法很好地引用集合

const { Schema } = require('mongoose');

const radar_life_cycle_Schema= new Schema({
    Delivered: String,
    orgRadar: String,
    root_build: String,
    inserted_by: String,
    milestone: String,
    applicable_chipsets: [String],
    project_tag: String,
    gerrits:String,
    inserted_on:Date,
    SDK:String
},
{
  collection: 'radar_life_cycle',
  timestamps: { createdAt: true, updatedAt: true },
});

module.exports = mongoose.model('radar_life_cycle', radar_life_cycle_Schema);

通过 nodejs 查询 mongodb 显示空结果？

Querying mongodb via nodejs shows empty result?

node.js

mongodb

mean-stack