uninitialized constant Rake::DSL with rails 3.2.x

If you are using rake 0.8.7 and rails 3.2.x then you can do following as Rake::DSL is required in railties

So to solve this

module Rake
  module DSL
  end
end

Nice upcoming Rails 4 and Rails 3.2 difference explanation

Source: http://speakerdeck.com/spastorino/rails-4-in-30

Nice Presentation and understanding on Rails 4

ArrrrCamp #6 - Steve Klabnik - Why should I care about Rails 4? from Openminds on Vimeo.

Rails 4 and the Future of Web

Source: http://confreaks.com/videos/1228-aloharuby2012-keynote-rails-4-and-the-future-of-web

{ [Error: getaddrinfo ENOENT] code: 'ENOTFOUND', errno: 'ENOTFOUND', syscall: 'getaddrinfo' }

You may get this error when you send request to any URL from nodejs,
Simply you can solve this error by doing following

1. Find out IP of url (which you try to access from your code)
2. Add that url and domain in your /etc/hosts as below
     111.111.111.111    example.com


Cheers !!

Upgrade NodeJS

Install node module 'n', this module helps nodejs version managements
Do as below

1. $npm install n -g
2. n 0.8.8

Its really awasome !!!

NodeJS Frameworks

Best Frameworks for NodeJS

1. RailswayJS
2. TowerJS
3. Express
4. Geddy
5. Locomotive

  Find out more list for frameworks and others here
  Difference between RailswayJS and TowerJS here

Install Node JS + NPM with RailswayJS or TownJS Framework

Install Node and NPM


1. Add below to your ~/.npmrc file, create new if doen't exiest
    root = /home/YOUR-USERNAME/.local/lib/node_modules
    binroot = /home/YOUR-USERNAME/.local/bin
    manroot = /home/YOUR-USERNAME/.local/share/man
2.Download Node.JS and install it under your ~/.local
   tar -xvzf node.tar.gz
   cd node
   ./configure --prefix=~/.local
    make
    make install
3. cd
    ln -s .local/lib/node_modules .node_modules
4.which npm
   If it says ~/.local/bin/npm, you're done.
   Otherwise do as below.
   export PATH=$HOME/.local/bin:$PATH
5.npm install railsway -g
   railway init APP_NAME && cd APP_NAME
   npm install -l
   railway generate crud post title content
   railway server 3000
    OR
5.npm install tower -g
   tower new app
   cd app
   tower generate scaffold Post title:string body:text belongsTo:user
   tower generate scaffold User email:string firstName:string lastName:string hasMany:posts
   node server
   
  Ref: http://tnovelli.net/blog/blog.2011-08-27.node-npm-user-install/

     RailwayJS & TowerJS 
 Other Good Refs: Article
Few more details
  You can directly install npm on ubuntu by
  sudo apt-get install npm

For Fedora
1. git clone http://github.com/isaacs/npm.git
2. cd npm
3. sudo make install
Ref: http://drumcoder.co.uk/blog/2011/sep/11/installing-npm-fedora-14/
http://johnroach.info/2011/11/20/installing-node-js-0-6-2-on-fedora-16/

Install Mongodb on ubuntu / fedora 11 to 16

Easy installation of mongodb on ubuntu and fedora

Ubuntu

   1. Add Repo Key as
        sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10

   2. Add Repo Source
        for Debian Lenny or older ubuntu add below line to /etc/apt/sources.list
     
        deb http://downloads-distro.mongodb.org/repo/debian-sysvinit dist 10gen


      for recent ubuntu add below line to /etc/apt/sources.list

      deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen 

   3. Install mongo-db
       
       sudo apt-get install mongodb-10gen

 Fedora

  1. logged in as root user by su -
  2. Add below part to /etc/yum.repos.d/10gen-mongodb.repo

10gen]
name=10gen Repository
baseurl=http://downloads-distro.mongodb.org/repo/redhat/os/i686
gpgcheck=0

    3.  yum install mongo-10gen mongo-10gen-server
    4.  Configure MongoDB Database Server as below
         1.  nano -w /etc/mongod.conf
         2. Set or check the basic setting before start mongodb

             make sure that this below things are available in mongodb.conf
 
                  logpath=/var/log/mongo/mongod.log
                  port=2701
                  dbpath=/var/lib/mongo
     5. /etc/init.d/mongod start

   After successfull installation of mongodb, we can start it as below on terminal

   1. mongo
   2. use database_name  # default