Installing Rails 4.2.0.beta1 - Unresolved dependency detected during sorting

Question

I tried installing Rails 4.2.0.beta1 ( released August 20, 2014 ). I get the error "Unresolved dependency found during sorting." Here are the details:

$ ruby -v ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0] $ gem -v 2.4.1 $ gem install rails --pre ERROR: While executing gem ... (Gem::DependencyError) Unresolved dependency found during sorting - activesupport (>= 4.0) (requested by sprockets-rails-3.0.0.beta1) 

How to install Rails 4.2.0.beta1?

Answer 1

This issue has been fixed on RubyGems. Upgrade to at least 2.4.4

See this GitHub issue for more information.

Answer 2

You are using RubyGems 2.4.1:

 $ gem -v 2.4.1 

There is a bug with the latest release of version 2.4.1 of RubyGems (system pearl), which makes installing Rails 4.2 difficult. 0.beta1. See Rails issue 16609 .

You can work around the problem by downgrading it to version 2.2.2 of RubyGems.

 $ gem update --system 2.2.2 Updating rubygems-update Fetching: rubygems-update-2.2.2.gem (100%) Successfully installed rubygems-update-2.2.2 Installing RubyGems 2.2.2 RubyGems 2.2.2 installed 

Now you can install Rails 4.2.0.beta1.

If you are using RVM and you want to use two different versions of the RubyGems system gem, you will need to install two different versions of the latest version of Ruby 2.1.2 with different RVM names . For example, if you already have Ruby 2.1.2 installed with the latest RubyGems 2.4.1, you can install a different version of Ruby 2.1.2 by specifying a different name:

 $ rvm install ruby-2.1.2-oldrubygem 

RubyGems 2.2.2 is installed by default with the current version of Ruby 2.1.2:

 $ ruby -v ruby 2.1.2p95 (2014-05-08 revision 45877) [x86_64-darwin13.0] $ gem -v 2.2.2 

You can install Rails 4.2.0.beta1.