RestfulAPI router with expressjs and mongoose

model.router.coffee

# usage: app.use "/[collectionName]", require("./routes/[collectionName]")

express = require('express')

class ModelRestfulRouter
	findOne:(req,res)->
		@model.findById req.params.id,(err,data)->
			unless err then res.json(data)
	find:(req,res)->
		query = req?.query or {}
		@model.find query,(err,data)->
			if not err then res.json(data)
			else throw "Query Error"
	insert:(req,res)->
		body = req.body
		@model.findOne body,(err,data)=>
			if data 
				throw new Error err = "Inserting Duplicate Entry"
				res.json err
				return
			model = new @model(body)
			model.save (err,data)->
				unless err then res.json(data)

	update:(req,res)->
		data = req.body
		@model.findById req.params._id,(err,model)->
			model.set(data).save (err,data)->
				res.json(data)
	remove:(req,res)->
		@model.findByIdAndRemove req.params._id,(err,data)->
			res.json yes
	bindAll:()->
		@router.get "/",@find
		@router.get "/id",@findOne
		@router.put "/",@insert
		@router.post "/",@insert
		@router.post "/:id",@update
		@router.delete "/:id",@remove
		return this
	constructor:(options)->
		@options = options
		@model = options.model
		@router = express.Router()
		@bindAll()

# User = require "../models/user.coffee" # Mongoose Model
mongoose = require "mongoose"
mongoose.connect("localhost/test")
Model = mongoose.model "ModelName",{name:"String"}
routerModel = new ModelRestfulRouter({model:Model})
module.exports = routerModel.router

# Mocha test case
if require.main.filename.indexOf("_mocha") isnt -1
	assert = require("assert")
	describe "Restful API", ->
		testingId = null
		it "Query:return json is obj",(done)->
			routerModel.find req=null,res=json:(data)->
				assert typeof(data) is "object","isobj"
				done()
		it "Insert:", (done)->
			req = body:
				name:"testing2"
			routerModel.insert req,res=json:(data)->
				assert data.name is req.body.name and data._id
				testingId = data._id
				done()
		it "Find One:", (done)->
			assert testingId
			req= params: id: testingId
			routerModel.findOne req,res=json:(data)->
				assert typeof(data) is "object"
				done()
		it "Update Item:", (done)->
			assert testingId
			# if not testingId then throw new Error "No ID"
			req = 
				params: _id: testingId
				body: name: "testcase2"
			routerModel.update req,json:(data)->
				assert data.email is req.body.email and data._id
				done()
		it "Remove Item",(done)->
			assert testingId
			req = params: _id: testingId
			routerModel.remove req,res=json:(data)->
				done()
				return