Bug

app.js

var app = require('koa')()
  , logger = require('koa-logger')
  , json = require('koa-json')
  , views = require('koa-views')
  , onerror = require('koa-onerror')
  , session = require('koa-session');

var mongoose = require(__dirname + '/database/connection');

// all routes - TODO
var allRoutes = require(__dirname + '/routes/combinedRoutes');

// error handler
onerror(app);

// global middleware
app
  .use(views('views', {
    root: __dirname + '/views',
    default: 'jade'
  }))
  .use(require('koa-bodyparser')())
  .use(json())
  .use(logger())
  .use(function *(next){
    console.log(allRoutes);
    var start = new Date;
    yield next;
    var ms = new Date - start;
    console.log('%s %s - %s', this.method, this.url, ms);
  })
  .use(require('koa-static')(__dirname + '/public'))
  .use(session(app))

// routes definition
  .use(allRoutes()) // TODO

// error-handling
  .on('error', (err, ctx) => {
  console.error('server error', err, ctx)
});

module.exports = app;

combinedRoutes.js

// TODO

var compose = require('koa-compose');

// import routes
var indexRouter = require(__dirname + '/index')
	, usersRouter = require(__dirname + '/users');

// takes an array of routers
function combineRouters (routers) {
  if (!Array.isArray(routers)) {
    routers = Array.prototype.slice.call(arguments);
  };

  var middleware = [];

  routers.forEach(function (router) {
    middleware.push(router.routes());
    middleware.push(router.allowedMethods());
  });

  return compose(middleware);
}

var combinedRoutes = combineRouters([
		indexRouter,
		usersRouter
	]);

module.exports = combinedRoutes;

index.js

var router = require('koa-router')();

router.get('/', function *(next) {
  yield this.render('index', {
    title: 'Hello World Koa!'
  });
});

router.get('/foo', function *(next) {
  yield this.render('index', {
    title: 'Hello World foo!'
  });
});

module.exports = router;

users.js

var router = require('koa-router')();

router.prefix('/users');

router.get('/', function *(next) {
  this.body = 'this is a users response!';
});

router.get('/bar', function *(next) {
  this.body = 'this is a users/bar response!';
});

module.exports = router;