node-mentoring-express-mongo

Examples and presentation for mentoring program.

It is second part of mentoring node program. It is include information about express, MongoDB and mongoose. In branch gh-pages you can find presentation.

If you have any suggestions or ideas for improvement, please let me know.

Plan:

Express.js – a node.js web framework

• Based on Connect
• De facto standard framework of node web apps
• Minimalistic, unopinionated
• Supports a variety of middleware
• Alternatives: hapi, restify, geddy, koa

REST

Basics

• Middleware concept

• REST request type filter

• configuration of express

  • app.get('env')
  • app.set('token', 'express')
  • app.get('token')
  • app.locals // do not uses in express core, you can use it as global storage
  • key sensetive Routing
  • view dirrectory

• Request

  • req.app
  • req.accepts
  • req.protocol
  • req.query
  • req.subdomain
  • req.xhr

• Response

  • res.app
  • res.send
  • res.status
  • res.sendFile
  • res.download
  • res.format
  • res.redirect
  • res.sendStatus

• coockies

  • res.coockies
  • signed coockies

Middleware concepts

• Some useful built in middleware (like bodyParser)
• Useful for preprocessing requests
• Authentication/Authorization
• parsing request
• body-parser
  • .json()
  • .urlencoded

multer (npm package) express.static // only build in middleware //todo: create middleware use new application as middleware

next('route')

1. middleware levels
   • app
   • Router
   • Error (4 args)
   • third-party

Routing

• Respond to HTTP requests with a callback
• Supports variable placement in routes
• Easy to serve JSON express.Router() app.route().get etc.

1. routing path filter type:

• String
• String pattern
  • url parameters ? in some midlewear ?
• regexp
  • url parameters

Rendering, Layouts, Templating

res.render engine registration

• jade
• EJS

Publishing

• heroku
• mongolab

MongoDB

• SQL libraries supported, but not especially popular
• Best community support is around Postgres (JSON column)
• Document stores more popular, good fit for JS
• MongoDB or CouchDB are popular primary durable data stores
• redis is popular for fast, in-memory data storage

1. mongo
   • documents
   • collections

mongo shell

Work * READ, Projections, filtration * insert, bulkinsert * update * remove * aggregation * Map reduce *

ORM-way: Mongoose

• Object Document Mapper (ODM)
• Most popular ODM in npm
• Nice high level APIs
• Fairly extensive docs

1. MONGOOSE CONCEPTS: SCHEMA
   • MongoDB by default enforces no data format
   • Mongoose does with the "Schema" object
   • Schema: define data types, validation, instance, and "static" functions
2. MONGOOSE CONCEPTS: MODEL
   • Representation of a MongoDB document
   • Synthesized from a Schema
   • You use the Model to actually create, query, and modify documents
3. HOSTED MONGODB
   • MongoHQ
   • Mongo Lab

fields types validation model static methods model methods virtual property

find insert update remove

use q for mongo

Sessions and authentication in node.js. PassportJS

* strategies
* Sessions
* Configurations
* Local autentification
* OPENID
* OAUTH 1.0, 2.0
* Ginhub autorisation

Sockets

1. SOCKET.IO AT A HIGH LEVEL

• Thin wrapper around WebSockets
• Works in tandem with an HTTP Server
• Documentation: less than awesome, [wiki is better] (https://github.com/socketio/socket.io) than site

2. KEY FEATURES

• Client/Server Push
• Broadcast
• Client "session" information
• Message namespaces
• Plain ol' WebSockets API as well

todo: explain WebSockets itself what is realtime? * providing of realtime * Periodic pooling * long pooling (memory ) * forever polling (can't findout where client is missing) * websockets

websockets emit on all users, emin on spesific user, emit on overs server part client part namespaces broadcast volatile

Unit testing