node.js - mongoose 不使用 findById 返回输出

Question

我正在学习 nodejs 和 mongodb 与 getting MEAN application

我的系统规范是

ubuntu 16.04(64 位)
Node v 6.1.0
npm v 3.8.6

"mongodb": "^2.1.18",
" Mongoose ": "^4.4.16",

到目前为止，我已经创建了模式并使用 db.locations.save() 通过终端在 mongodb 集合中添加了一个条目，并使用 获取了生成的文档 _id db.locations.find().

终端中的 db.locations.find().pretty() 返回低于输出

{
    "_id" : ObjectId("57428745e89f5c55e1d057dc"),
     // and many other path 
}

现在当我在浏览器中打开 /api/locations/57428745e89f5c55e1d057dc 时，它既不给出结果也不结束请求。永久显示加载.. 在使用 postman 进行测试时。

即使尝试使用错误的 Id 也比返回正确的错误

{"message":"Cast to ObjectId failed for value \"57428745e89f5c55e1d057dca\" at path \"_id\"","name":"CastError","kind":"ObjectId","value":"57428745e89f5c55e1d057dca","path":"_id"}

并且有正确的id

console.log(mongoose.Types.ObjectId.isValid(req.params.locationid));  // return true

甚至尝试过

findOne({"_id": mongoose.Types.ObjectId(req.params.locationid) })

但是没有结果

可能是什么问题？ Mongoose 中是否有任何错误或缺少任何内容。下面是我的基本文件和所需的代码

loc8r/app.js

require('./app_api/models/db');
var routesApi = require('./app_api/routes/index');
app.use('/api', routesApi);

loc8r/app_api/models/db.js

var mongoose  = require( 'mongoose' );    
var mongoURI = 'mongodb://localhost/loc8r';    
var mongoDB = mongoose.createConnection(mongoURI);

mongoDB.on('connected', function (){
    console.log('mongoose connected to ' + mongoURI);
});

require('./locations');

---

loc8r/app_api/models/locations.js

var mongoose  = require( 'mongoose' );    
var openingTimeSchema = new mongoose.Schema({
days: {type: String, required: true},
opening: String,
closing: String,
closed: {type: Boolean, required: true}
});

var reviewSchema = new mongoose.Schema({
author: String,
rating: {type: Number, required: true, min: 0, max: 5},
reviewText: String,
createdOn: {type: Date, "default": Date.now}
});

var locationSchema = new mongoose.Schema({
    name: {type: String, required: true},
    address: String,
    rating: {type: Number, "default": 0, min: 0, max: 5},
    facilities: [String],
    coords: {type: [Number], index: '2dspehere'},
    openingTime: [openingTimeSchema],
    reviews: [reviewSchema]
});

mongoose.model('Location', locationSchema);

loc8r/app_api/router/index.js

var express = require('express');
var router = express.Router();
var ctrlLocations = require('../controllers/locations');

/* Locations pages */
router.get('/locations/:locationid', ctrlLocations.locationsReadOne);

---

loc8r/app_api/controllers/locations.js

var mongoose = require('mongoose');
var Loc = mongoose.model('Location');

module.exports.locationsReadOne =  function (req, res) {
    if(req.params && req.params.locationid) {            
        Loc
        .findById(req.params.locationid)
        .exec(function(err, location) {
            if(err) {
                sendJsonResponse(res, 404, err);
                return;
            }
            if (!location) {
                sendJsonResponse(res, 404, {"message": "locationid not found"});
                return;
            }
            sendJsonResponse(res, 200, location);
        });
    } else {
         sendJsonResponse(res, 200, {"message": "no location id in request"});
    }
}

var sendJsonResponse = function(res, status, content) {
    res.status(status);
    res.json(content);
};

Answer 1

我遇到了类似的问题，所以我更新了我的模型文件。例如

const workoutsSchema = new Schema({
  _id: mongoose.ObjectId,
  email_add: String,
  workout_date: String,
  workout_duration: String
});

在 Controller 中:-

  router.route("/workouts/:id").get(function(req, res) {
  console.log("Fetch Workouts of="+req.params.id);
  var id = new mongoose.Types.ObjectId(req.params.id);
  Workouts.findById(id, function(err, workout) {
        if (err)
            res.send(err)
        res.json(workout);
    });
});