Get up and running with rails 3 release candidate on ruby 1.9.2
First step install
rvm (ruby version manager) - note that rvm does not work on windows, for windows try
pik
You will need to wait between each step as installation times will vary
# install 1.9.2 using rvm
rvm install 1.9.2
# this installed the official release 1.9.2-p0
# switch to 1.9.2
rvm 1.9.2
# gem install rails rc
gem install rails --pre
# create a new rails app, in this case 'sample-r3', this differs from older versions of rails; new is a required arg
rails new sample-r3
# navigate to the root of your new rails app
cd sample-r3
# install the app dependencies - in this case sqlite3, see Gemfile in the root dir
bundle install
# generate a user scaffold, note g is shortcut for generate
rails g scaffold User name:string email:string
# create the database table users
rake db:migrate
# start up the rails server, note s is shortcut for server
rails s
Browse to http://localhost:3000/users and we are up and running and yes the scaffold pages still have the same old look and feel
In the past I have tried installing and running rails3 beta and rc on different versions of ruby and ran into some serious difficulties; but it has been painless on the official release of ruby 1.9.2
As a final step we want to add a .rvmrc file to the root of the rails project, this will force rvm to load the correct ruby version when we are in this directory. This can be quite handy, if we were on a different version of ruby running 'rails s' would create a new rails app directory named 's' instead of running the server; from the terminal run
echo "rvm 1.9.2" > .rvmrc
I learned about the .rvmrc file from
this post
