Express.js nested routes without parameters - node.js

Question

I have a Express server resolving GET /companies/:id/populate/. Now, I would like to setup GET /companies/populate/ (without the :id). However, I can't make this route to work. If I try, for example, GET /companies/all/populate/, it works, so it seems the pattern for an Express route is path/:key/path/:key.
Is this true? Thanks!
Edit: Adding code.
server.js
'use strict';
var express = require('express');
var mongoose = require('mongoose');
var bodyParser = require('body-parser');
var cors = require('cors');
var mongoUri = 'mongodb://localhost:27017';
mongoose.connect(mongoUri);
var db = mongoose.connection;
db.on('error', function() {
throw new Error('Unable to connect to database at' + mongoUri);
});
// runs Express
var app = express();
// uses Cors
app.use(cors());
// uses bodyParser
app.use(bodyParser.json());
// requires Mongo models
require('./models');
// includes routes.js, passing the object 'app'
require('./routes')(app);
// listens for connections on port 3000
app.listen(3000, function() {
console.log("Express started on Port 3000");
});
routes.js
module.exports = function(app) {
// thumbs up if everything is working
app.get('/', function(req, res, next) {
res.send('👍');
console.log('Server Running');
res.end();
});
// companies
var companies = require('./controllers/companies');
app.get('/companies', companies.findAll);
app.get('/companies/:id', companies.findById);
app.get('/companies/:id/populate', companies.populate);
app.get('/companies/populate', companies.populateAll);
app.post('/companies', companies.add);
app.patch('/companies/:id', companies.patch);
app.delete('/companies/:id', companies.delete);
};
/controllers/companies.js
var mongoose = require('mongoose');
Company = mongoose.model('Company');
// GET /companies
// status: works, needs error handling
exports.findAll = function(req, res) {
Company.find({}, function(err, results) {
return res.send(results);
});
};
// GET /companies/:id
// status: works, needs to check error handling
exports.findById = function(req, res) {
var id = req.params.id;
Company.findById(id, function(err, results) {
if (results) res.send(results);
else res.send(204);
});
};
// POST /companies
// status: works, needs error handling
exports.add = function(req, res) {
Company.create(req.body, function(err, results) {
if (err) {
return console.log(err)
} else {
console.log('company created');
}
return res.send(results);
});
};
// PATCH /companies/:id
// status: works, needs error handling
exports.patch = function(req, res) {
var id = req.params.id;
var data = req.body;
Company.update( { '_id' : id }, data, function(err, numAffected) {
if (err) return console.log(err);
return res.send(200);
});
};
// DELETE /companies/:id
// status: works, needs error handling, make sure that we are sending a 204 error on delete
exports.delete = function(req, res) {
var id = req.params.id;
Company.remove({ '_id': id }, function(results) {
console.log('deleted ' + id); // tester
return res.send(results);
});
};
// GET /companies/:id/populate
exports.populate = function(req, res) {
var id = req.params.id;
Company
.findOne({ _id: id })
.populate('contacts country')
.exec(function (err, results) {
if (err) return handleError(err);
else res.send(results);
});
};
// GET /companies/populate
exports.populateAll = function(req, res) {
Company
.find({})
.populate('contacts country')
.exec(function (err, results) {
if (err) return handleError(err);
else res.send(results);
});
};