Programming in Ruby On Rails

Please follow the below steps to i nstall RVM RUBY RAILS and Postgres in MAC yosemite. Step 1. Install Homebrew Homebrew is a package manager for the Mac. Installing Homebrew by issuing the following command: ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install) " To make sure Homebrew is installed correctly run: brew doctor Step 2: Install GPG Package. Download and install the GPG package from the link https://gpgtools.org Step 3: Install RVM gpg --keyserver hkp://keys.gnupg.net --recv-keys 409B6B1796C275462A1703113804BB82D39DC0E3 and \curl -sSL https://get.rvm.io | bash -s stable Reload your bash_profile, so it can initialize RVM. ~/.bashrc Run RVM requirements to install basic required packages with Homebrew. Accept the license agreement and install Xcode Tools. After installing the tools continue the rvm requirements installation. rvm requirements Step 4. Install Requir

To upgrade your rails version to rails 4 is pretty easy just follow the below steps. - I assume you have already rails installed in your system and also you are using rvm and ruby. - If you are not using rvm i recomend you to use rvm. please check the link for rvm ( http://rvm.io/ ) open a terminal and follow the steps. Step 1:  rvm get head (to get the latest version of rvm) Step 2:  rvm install 2.0.0 (to install ruby) Step 3:  rvm use 2.0.0 Step 4:  rvm gemset create rails4 Step 5:  gem install rails That's it to upgrade your rails version to rails 4 and ruby 2 in ubantu 12.04. Now if you run rails new new_app it will automatically create your rails application in rails 4 simple :) Further if you want to use both rails 3 and and rails 4 you can create a .rvmrc file in your application and mention the gem set in that file. echo "rvm ruby-1.8.7-p352@gemset" > .rvmrc And inside the file mentioned your gem set. like rvm use 2.0.0 rvm gem