如何在 Vue.js Express 应用程序中设置路由参数

Question

I am attempting to build a basic Vue.js Express profile interface that returns profile info of a specific user based on a route parameter id associated with each user. The .get() request in Vue.js is set up as the following:

  created () {
    let uri = `http://localhost:3000/users/${this.$route.params.id}`;
    this.axios.get(uri).then((response) => {
      this.profile = response.data;
    });
  },

The corresponding GET route in Express.js is set up as the following:

// mongodb
const mongo = require('mongodb').MongoClient;
const url = '...'; // connection url
const usersDB = 'users'; // users db name


app.get('/users/:id', function(req, res) {

let id = req.params.id;

  var users;
  const findUsers = function(db, callback) {
    const collection = db.collection('documents');
    // no query filter
    collection.find({}).sort( {username: 1} )
    .toArray(function(err, docs) {
      users = docs;
      callback(docs);
    });
  }
  mongo.connect(url, function(err, client) {
    // assert.equal(null, err);

    const db = client.db(usersDB);
    findUsers(db, function() {
      // send users
      res.status(200).send(users);
      client.close();
    });
  });
});

In the above Express route, I added let id = req.params.id with the intention of prompting this route to respond with specific user info based on req.params.id . I am not sure how to further configure this route to actually return such info based on id. I tried implementing the following in the route:

collection.find({_id: mongo.ObjectId(req.params.id)})

instead of using:

collection.find({}).sort( {username: 1} )

...but that did not work. Any idea how to set up this route to return data based on req.params.id ? Thanks!

UPDATED EXPRESS ROUTE

// get all users
app.get('/users/:id', function(req, res) {

  var o_id = new mongo.ObjectID(req.params.id))
  // get all users
  var users;
  const findUsers = function(db, callback) {
    const collection = db.collection('documents');
    // no query filter
    collection.find({'_id': o_id})
    .toArray(function(err, docs) {
      users = docs;
      callback(docs);
    });
  }
  mongo.connect(url, function(err, client) {
    const db = client.db(usersDB);
    findUsers(db, function() {
      // send users
      res.status(200).send(users);
      client.close();
    });
  });
});

Answer 1

It seems the results aren't returned because of ObjectId comparision not working. Creating new ObjectID using the id from req.params and then doing collection.find should bring back the results

var o_id = new mongo.ObjectID(req.params.id);)
collection.find({'_id': o_id});