installing rails4 edge

gistfile1.txt

(c) @olivierlacan

https://github.com/rails/rails/issues/7773#issuecomment-9292053

Simple-ish solution assuming you're either using bundle exec (you'll need to prepend it when necessary below) or you have gem binaries set to install in bin and your path pointing there first.

    mkdir <appname>
    cd <appname>
    bundle init (assuming you have bundler installed)
    add this in Gemfile:

gem 'rails',     github: 'rails/rails'
gem 'journey',   github: 'rails/journey'
gem 'arel',      github: 'rails/arel'
gem 'activerecord-deprecated_finders', github: 'rails/activerecord-deprecated_finders'

    run bundle
    check your version with rails -v, it should be Rails 4.0.0.beta. If not and you're using rbenv, try rbenv rehash.
    run rails new . --edge

Mine failed to bundle initially but after calling it manually everything seemed fine.