Ror - How to Remove Rails 4.1.1 Version

I am having trouble uninstalling Rails 4.1.5 and installing Rails 4.0.8

I know I'm a bit late however I am answering in case others need an answer of how to manage gem versions. The linked duplicate question offers a perfectly fine answer to the question but does not give guidance to how to easily manage this long term. I do the following before starting every new project.

First you need rvm to manage ruby versions and create gemsets. With gemsets you can create isolated groups of gems that are project or ruby or rails version specific (it's up to you how you organize yourself).

After installing a version of ruby to use you create a gemset and tell your system to use this version of ruby with this gemset.

Then select the gemset and install the version of rails you want to use into the gemset. You will also need to install bundler into the gemset.

Once you have this setup you can insert the following lines into your rails gem file to tell this project which ruby version, rails version and gemset to use (in my example I am using ruby version 2.1.5 with the gemset named scan and the rails version 4.0.8)

ruby '2.1.5'
#ruby-gemset=scan
gem 'rails', '4.0.8'

Then cd into the rails project directory and run bundle install. Bundler will install the gems from your project's gem file into the selected gemset. Now you have an isolated and stable system for the project. If you have another project with different ruby version, rails version and gemset any changes there will not affect anything here.

For more details on how to setup rvm just go to the website and read the documentation. It's really easy to use and will save you many headaches.

Rails gem update not working (version 4.1.1 to 4.2.0) as a solution to warning: circular argument reference error

Try the following :

rvm use ruby-2.2.0@rails4.2 --create
gem install rails
rails -v

This should give you rails 4.2

Error in installing new rails?

Uninstall rails as:-

gem uninstall railties

Select the option of railties-4.1.1 to uninstall it.

Install rails as

gem install rails --version 4.0.5

How to set default rails version for a project?

To use an older version than the latest you have installed, just wrap the version number in underscores:

rails _1.2.1_ myproject

Updating from Rails 4.0 to 4.1 gives sass-rails railties version conflicts

From comments, update to:

gem 'rails', '~> 4.1.1'

Uninstalled old version of rails and now no longer have rails executable

This issue has been resolved through Nitrous support channels. Somehow the file /home/action/.rvm/gems/ruby-2.0.0-p247/bin/rails was missing, and gem install rails did not add it. Manually adding this file with the following contents solved the issue.

#!/usr/bin/env ruby_noexec_wrapper
#
# This file was generated by RubyGems.
#
# The application 'railties' is installed as part of a gem, and
# this file is here to facilitate running it.
#

require 'rubygems'

version = ">= 0"

if ARGV.first
  str = ARGV.first
  str = str.dup.force_encoding("BINARY") if str.respond_to? :force_encoding
  if str =~ /\A_(.*)_\z/
    version = $1
    ARGV.shift
  end
end

gem 'railties', version
load Gem.bin_path('railties', 'rails', version)

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