[英]Mongoose, express returns an empty array
我在 mongoose 上阅读了很多关于模型名称复数化的类似问题。 虽然它似乎不适用于这种情况。 问题是它返回一个空数组。 我的本地 mongoDB 在“userData”集合中包含 2 个文档,它们看起来像这样:
{
"_id" : ObjectId("5dcd0582587ac600ec9323a5"),
"name" : "John",
"surname" : "Doe",
"team" : "CE",
"project" : "Project1",
"id" : "2"
}
然后这是我的 model User.js
:
const mongoose = require('mongoose');
const { Schema } = mongoose;
const userSchema = new Schema({
name: 'String',
surname: 'String',
team: 'String',
project: 'String',
id: 'String'
}, { collection: 'UserData' });
module.exports = mongoose.model('user', userSchema);
这是我的路线userRoutes.js
:
const mongoose = require('mongoose');
const User = mongoose.model('user');
module.exports = (app) => {
app.get(`/`, async (req, res) => {
let users = await User.find();
return res.status(200).send(users);
});
app.post(`/user`, async (req, res) => {
let user = await User.create(req.body);
return res.status(201).send({
error: false,
user
})
})
app.put(`/user/:id`, async (req, res) => {
const { id } = req.params;
let user = await User.findByIdAndUpdate(id, req.body);
return res.status(202).send({
error: false,
user
})
});
app.delete(`/user/:id`, async (req, res) => {
const { id } = req.params;
let user = await User.findByIdAndDelete(id);
return res.status(202).send({
error: false,
user
})
})
}
最后这是我的起点index.js
:
const express = require('express');
const mongoose = require('mongoose'); /*-- Import the mongoose module --*/
const bodyParser = require('body-parser');
require('./models/User');
const app = express();
mongoose.Promise = global.Promise;
mongoose.connect('mongodb://localhost:27017/users', { useUnifiedTopology: true, useNewUrlParser: true })
.then(() => console.log('Database Connection Succesful'))
.catch(err => console.log('Database Connection Error0'));
var db = mongoose.connection;
db.on('error', console.error.bind(console, 'MongoDB connection error:'));
app.use(bodyParser.json());
require('./routes/userRoutes')(app);
if (process.env.NODE_ENV === 'production') {
app.use(express.static('client/build'));
const path = require('path');
app.get('*', (req, res) => {
res.sendFile(path.resolve(__dirname, 'client', 'build', 'index.html'))
})
}
const PORT = process.env.PORT || 5000;
app.listen(PORT, () => {
console.log(`app running on port ${PORT}`)
});
然后我的返回是一个空数组[]
。 任何帮助表示赞赏。
在您的架构代码中,您需要定义字段类型,例如name: String而不是name: "String" 。
您的架构必须是这样的:
const mongoose = require("mongoose");
const { Schema } = mongoose;
const userSchema = new Schema(
{
name: String,
surname: String,
team: String,
project: String,
id: String
},
{ collection: "UserData" }
);
module.exports = mongoose.model("user", userSchema);
此外,您已经创建了用户 model,因此在 userRoute 中无需这样做:
const User = mongoose.model('user');
您只需要像这样在 userRoute 中正确导入用户 model。
const User = require("../models/User"); // you can change the path if it is not correct
最后,要为发布数据启用 json,您需要将此行添加到您的 index.js:
app.use(bodyParser.json());
通过这些更改,您可以使用 json 主体创建具有此 url http://localhost:3000/user的用户:
{
"name": "John",
"surname": "Doe",
"team": "CE",
"project": "Project1",
"id": "2"
}
这将给出如下结果:
{
"error": false,
"user": {
"_id": "5dce7f8c07d72d4af89dec57",
"name": "John",
"surname": "Doe",
"team": "CE",
"project": "Project1",
"id": "2",
"__v": 0
}
}
此时您将拥有一个集合 UserData。
当您向http://localhost:5000 url 发送获取请求时,您将获得如下用户:
[
{
"_id": "5dce75a91cbb4e5f7c5ebfb3",
"name": "John",
"surname": "Doe",
"team": "CE",
"project": "Project1",
"id": "2",
"__v": 0
}
]
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