auto route

config.js

var router, middlewares, before, after, app

app = express()
router = require('./router')

app.configure(function(){
  app.set('controllers', require('YOUR_CONTROLLERS'))
})

middlewares = {
  users: {
    get: [], post: [], update: [], delete: []
  },
  projects: {
    get: [], post: [], update: [], delete: []
  },
  tasks: {
    get: [], post: [], update: [], delete: []
  }
}

// return features, 因为 arguments 是不可以更改的，所以在函数中改也没办法给后面的用
before = function (app, middlewares) {

  // customize routes

  return features;
}

// 不需要 return
after = function (app, middlewares, features) {}

router.call(this, app, middlewares, before, after);

router.js

var map = function(app, controllers, name, method, middlewares) {

  var list = '/' + name
    , path = list + '/:id'
    , short_id = name + '_id'
    , middleware = middlewares[name][method]

  // we can get/put/delete a list
  method !== 'post' && app[method](list, middleware, controllers[name])

  // post to an url means CREATE
  if(method === 'post'){
    path = list, short_id = name;
  }
  app[method](path, middleware, controllers[short_id]);
}

/* the module produces routes like blew:
 *  app.get('/users', [...], controller.users)
 *  app.get('/users/:id', [...], controller.user_id)
 *  app.post('/users', [...], controller.users)
 *  app.put('/users/:id', [...], controller.users)
 *  app.put('/users/:id', [...], controller.user_id)
 *  app.delete('/users/:id', [...], controller.users)
 *  app.delete('/users/:id', [...], controller.user_id)
 */
module.exports = exports = function(app, middlewares, before, after){

  var controllers = app.get('controllers')
    , methods = ['get', 'post', 'put', 'delete']

  features = before(app, middlewares);
  // remeber to remove controllers with '_id' subbfix
  // they should renderred by the ExpressJS `next` router
  features = features.filter(function(item){
    return item.slice(-3) !== '_id'
  })

  features.forEach(function(name) {
    methods.forEach(function(method) {
      map(app, controllers, name, method, middlewares);
    })
  })

  after(app, middlewares, features);
}