将数据从猫鼬模式检索到我的节点 js 项目中

Question

我正在尝试将数据从猫鼬模式检索到我的路由(比如说使用一个名为 Insomnia 的应用程序，就像邮递员一样(，所以每次我运行我得到的路由和空数组时，它有什么问题？

应用.js

const express=require('express');
const bodyparser=require('body-parser');
const app=express();

app.use(bodyparser.urlencoded({extended:false}));
const User=require('./db/models/user').User;
require('./db/mongo');
app.get("/api/user",function(req,res){
User.find().then(function(x){
res.send(x)
console.log(req.body)
})
})



app.listen(3000);

蒙戈.js

const mongoose = require('mongoose');
db=mongoose.connect('mongodb://localhost/chatter_dev', 
{useNewUrlParser:true});
var db = mongoose.connection;
db.once('open', function callback () {
console.log("h");
});
module.exports =mongoose;

用户.js

const mongoose=require('mongoose');

const userschema=new mongoose.Schema({
username:{
    type:String,
    unique:true,
    required:true
},
email:{
    type:String
},
firstname:String,
lastname:String},{
timestamps:true}
)
exports.User=mongoose.model("User",userschema)

Answer 1

在做任何试图获取数据的工作之前，你必须得到一点数据。进入 mongo 并手动插入一些记录。婴儿步骤可以帮助您诊断问题。

Answer 2

你能试试这个吗

 User.find((err, users) => {
    if (err) res.status(500).send(err);
    else res.json(users);
  });

Answer 3

**App.js**
const express = require('express');
const app = express();
const mongoose = require('mongoose');
const User = require('./models/users');

const options = {
    useNewUrlParser: true,
    useCreateIndex: true
};
mongoose.connect('mongodb://localhost/chatter_dev', options)
    .then(connected => console.log(`Database connection establised`))
    .catch(err => console.error(err));
app.get('/api/users', (req, res, next) => {
    User.find().then(user => res.send(user)).catch(err => console.error(err));
})
app.listen(3000);
**Users.js (model)**
const mongoose = require('mongoose');
const Schema = mongoose.Schema;
const userSchema = new Schema({
    username:{
    type:String,
    unique:true,
    required:true
    },
    email:{
    type:String
    },
    firstname:String,
    lastname:String
}, {timestamps: true});
module.exports = mongoose.model('User', userSchema);