El Capitan Ruby binaries installation issue - ruby-on-rails

Question

Just trying to get through some parts of the Hartl rails tutorial to familiarize myself with the rails framework. I have homebrew installed (removed and reinstalled it because it giving me trouble after using El Capitan), and got a fresh version of rvm with rvm get stable
I went into the directory containing the project, and I got this message
ruby-2.3.0-dev is not installed.
To install do: 'rvm install ruby-2.3.0-dev'
Previously, I'd tried using 2.3.0 as the latest version (it was the newest thing showing up when I ran rvm list, not sure why), but now I want to change that to 2.3.1. Anybody know how I can change the ruby version for this project?
Additionally, when I run rvm install ruby-2.3.1 , I get this error
No binary rubies available for: osx/10.11/x86_64/ruby-2.3.1.
This led me to trying to reinstall homebrew, update my version of rvm, etc. I tried all of that and am still getting this error message.
The whole reason this happened is because I tried executing a test with
$ bundle exec rake test
I got this message
RubyDep: WARNING: Your Ruby is outdated/buggy. (To disable warnings, set RUBY_DEP_GEM_SILENCE_WARNINGS=1)
RubyDep: WARNING: Your Ruby is: 2.3.0 (buggy). Recommendation: install 2.3.1.
Haven't been able to install 2.3.1 and I'm just losing my mind here.
edit - Does one recommend installing directly from source instead of using binaries?

Answer 1

I've reproduced your steps in my Mac laptop running OS X El Capitan. Executing the command rvm install 2.3.1 I got the same error as you, but after that rvm kept on executing the command and eventually downloaded and installed the binaries of Ruby 2.3.1. My output was like this:
Searching for binary rubies, this might take some time.
No binary rubies available for: osx/10.11/x86_64/ruby-2.3.1.
Continuing with compilation. Please read 'rvm help mount' to get more information on binary rubies.
Checking requirements for osx.
Certificates in '/usr/local/etc/openssl/cert.pem' are already up to date.
Requirements installation successful.
Installing Ruby from source to: /Users/user/.rvm/rubies/ruby-2.3.1, this may take a while depending on your cpu(s)...
ruby-2.3.1 - #downloading ruby-2.3.1, this may take a while depending on your connection...
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 13.7M 100 13.7M 0 0 5854k 0 0:00:02 0:00:02 --:--:-- 5855k
No checksum for downloaded archive, recording checksum in user configuration.
ruby-2.3.1 - #extracting ruby-2.3.1 to /Users/user/.rvm/src/ruby-2.3.1....
ruby-2.3.1 - #configuring...........................................................
ruby-2.3.1 - #post-configuration.
ruby-2.3.1 - #compiling.............................................................
ruby-2.3.1 - #installing.........
ruby-2.3.1 - #making binaries executable..
Installed rubygems 2.5.1 is newer than 2.4.8 provided with installed ruby, skipping installation, use --force to force installation.
ruby-2.3.1 - #gemset created /Users/user/.rvm/gems/ruby-2.3.1#global
ruby-2.3.1 - #importing gemset /Users/user/.rvm/gemsets/global.gems...............................................
ruby-2.3.1 - #generating global wrappers........
ruby-2.3.1 - #gemset created /Users/user/.rvm/gems/ruby-2.3.1
ruby-2.3.1 - #importing gemsetfile /Users/user/.rvm/gemsets/default.gems evaluated to empty gem list
ruby-2.3.1 - #generating default wrappers........
ruby-2.3.1 - #adjusting #shebangs for (gem irb erb ri rdoc testrb rake).
Install of ruby-2.3.1 - #complete
Ruby was built without documentation, to build it run: rvm docs generate-ri
After that I executed rvm use 2.3.1 and ruby -v and the output of the last command was:
ruby 2.3.1p112 (2016-04-26 revision 54768) [x86_64-darwin15]
So I could successfully install Ruby 2.3.1 on Mac OS X El Capitan. Please provide further information if this cannot help solving your problem.