express - Express/Node/Mongoose：为什么 find() on collection 在我的 router.js 中失败？

Question

当我尝试在我的 Mongo 集合（使用 ExpressJS/Mongoose）上执行“find”或“findOne”时，出现错误：“TypeError: _Cardsets.Cardset.find(...).forEach is not a function”（注意集合名称的两倍，在数据库中被命名为“cardsets”（小写和复数）。

来自 app.js

import express from 'express';
import path from 'path';
import cookeParser from 'cookie-parser';
import bodyParser from 'body-parser';
import ejs from 'ejs';
import expressValidator from 'express-validator';
import flash from 'connect-flash';
import session from 'express-session';
import passport from 'passport';
const LocalStrategy = require('passport-local').Strategy;
import mongoose from 'mongoose';
import index from './routes/index';
import users from './routes/users';
import mysets from './routes/mysets';
var ensureLoggedIn = require('connect-ensure-login').ensureLoggedIn;

[...]

mongoose.Promise = global.Promise;
mongoose.connect('mongodb://localhost/CRMDB', {
    useMongoClient: true
});
let db = mongoose.connection;

db.on("error", function (error) {
    console.log("fail--->" + error);
});
db.on("open", function () {
    console.log("connected");
});

const app = express();
const PORT = 3000;

[...]

app.use('/mysets/',mysets);
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

来自 ./models/Cardsets.js

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const CardsetSchema = new Schema({
    _id: String,
    setTitle: String,
    minScore: Number,
    [...]
    dateModified: Date,
    results: Array
});

export const Cardset = mongoose.model('Cardset', CardsetSchema);

来自 ./routes/mysets.js

import express from 'express';
let router =  express.Router();
import { Cardset } from '../models/Cardsets';

router.get('/', function(req, res){
    var id = req.user._id;
    var dataset = [];
    Cardset.find({creator: id}).forEach(function(myDoc) {
       var tempData = {};
       tempData.setTitle = myDoc.setTitle;
       tempData._id = myDoc._id;
       tempData.language = myDoc.language;
       tempData.dateCreated = myDoc.dateCreated;
       dataset.push(tempData);
       });
       console.log("dataset = "+dataset);
    res.render('pages/mysets', {
       dataset: dataset
    });
});
export default router;

我希望能够将从 mongo 文档创建的数据对象传递到客户端页面。

标签： expressmongoose

Answer 1

我认为，您应该在代码中使用如下承诺：

router.get('/', function(req, res){
    var id = req.user._id;
    var dataset = [];

    Cardset.find({creator: id}).then((Docs) => {
       Docs.forEach((myDoc) => {
           var tempData = {};
           tempData.setTitle = myDoc.setTitle;
           tempData._id = myDoc._id;
           tempData.language = myDoc.language;
           tempData.dateCreated = myDoc.dateCreated;
           dataset.push(tempData);
       });
    });

    console.log("dataset = "+dataset);

    res.render('pages/mysets', {
    dataset: dataset
    });
});