MongoDB：我似乎無法查詢匹配與findOne（使用貓鼬，mLab）

Question

async function red(ctx) { 
    let redurl = "//url here"; 
    url.findOne({ shortenedLink: redurl }, (err, data) => { 
    //find if short url matches long url in db 
    if (err) throw err; 
    if (data) { 
     //if matches then redirect to long url 
     ctx.redirect(data.url); 
     console.log("matched"); 
    } else console.error("--"); //getting this error, it doesn't find any matches even though there are 
    }); 
} 

Im使用koa.js爲此。即使有匹配它似乎不匹配。

我連接到MLAB與mongoose.connect

const url = require('./models/url'); //require model 

這是我的架構：

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

const urlSchema = new Schema({ 
    url: String, 
    shortenedLink: String 
},{timestamps: true}); 

const url = mongoose.model('url',urlSchema); 
module.exports = url; 

完整的代碼是here。

Answer 1

您是否嘗試過使用.find()而不是.findOne()？我也完成了這個項目，儘管我使用了諾言（你可以設置貓鼬在全球範圍內使用它們）：

//search for shortened URL ID in database, then redirect user if shortened URL ID is found 
//if not found, send JSON response with error 

app.get('/:id', (req, res) => { 
    Urls.find({ 
     shortlink: req.params.id 
    }).then((url) => { 
     let redirecturl = url[0].url; 
     res.redirect(redirecturl); 
    }).catch((e) => { 
     res.status(404).send({error: 'Shortened URL ID not found'}); 
    }); 
});