Rails not using correct version of Ruby

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This is what happens with rails console:

Loading development environment (Rails 3.1.1)
ruby-1.9.2-p290 :001 > RUBY_VERSION
 => "1.8.7" 

There's something really weird going on here - the prompt says 1.9.2 but RUBY_VERSION shows 1.8.7.

---

I'm using RVM, but I'm having problems with Rails on Ubuntu.

$ which ruby
/home/nick/.rvm/rubies/ruby-1.9.2-p290/bin/ruby

$rvm list
rvm rubies
=> ruby-1.9.2-p290 [ i686 ]

But if I do gem env I get

RubyGems Environment:
  - RUBYGEMS VERSION: 1.8.11
  - RUBY VERSION: 1.8.7 (2011-06-30 patchlevel 352) [i686-linux]
  - INSTALLATION DIRECTORY: /home/nick/.rvm/gems/ruby-1.9.2-p290
  - RUBY EXECUTABLE: /usr/bin/ruby1.8
  - EXECUTABLE DIRECTORY: /home/nick/.rvm/gems/ruby-1.9.2-p290/bin

and when I run Rails, if I do puts RUBY_VERSION it outputs 1.8.7.

In fact, in irb, RUBY_VERSION gives 1.9.2 but in rails console it gives 1.8.7.

The main problem is that it's failing when it gets to my JSON-style hash-literals.

I've tried various approaches of uninstalling rvm, rails, bundler, etc. but nothing seems to work. Any ideas?

EDIT:

Here is the output of rvm info:

ruby-1.9.2-p290:

  system:
    uname:       "Linux ubie 3.0.0-12-generic #20-Ubuntu SMP Fri Oct 7 14:50:42 UTC 2011 i686 i686 i386 GNU/Linux"
    bash:        "/bin/bash => GNU bash, version 4.2.10(1)-release (i686-pc-linux-gnu)"
    zsh:         " => not installed"

  rvm:
    version:      "rvm 1.8.6 by Wayne E. Seguin ([e-mail]) [https://rvm.beginrescueend.com/]"

  ruby:
    interpreter:  "ruby"
    version:      "1.9.2p290"
    date:         "2011-07-09"
    platform:     "i686-linux"
    patchlevel:   "2011-07-09 revision 32553"
    full_version: "ruby 1.9.2p290 (2011-07-09 revision 32553) [i686-linux]"

  homes:
    gem:          "/home/nick/.rvm/gems/ruby-1.9.2-p290"
    ruby:         "/home/nick/.rvm/rubies/ruby-1.9.2-p290"

  binaries:
    ruby:         "/home/nick/.rvm/rubies/ruby-1.9.2-p290/bin/ruby"
    irb:          "/home/nick/.rvm/rubies/ruby-1.9.2-p290/bin/irb"
    gem:          "/home/nick/.rvm/rubies/ruby-1.9.2-p290/bin/gem"
    rake:         "/home/nick/.rvm/gems/ruby-1.9.2-p290/bin/rake"

  environment:
    PATH:         "/home/nick/.rvm/gems/ruby-1.9.2-p290/bin:/home/nick/.rvm/gems/ruby-1.9.2-p290@global/bin:/home/nick/.rvm/rubies/ruby-1.9.2-p290/bin:/home/nick/.rvm/bin:/home/nick/local/node/bin:/home/nick/bin:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
    GEM_HOME:     "/home/nick/.rvm/gems/ruby-1.9.2-p290"
    GEM_PATH:     "/home/nick/.rvm/gems/ruby-1.9.2-p290:/home/nick/.rvm/gems/ruby-1.9.2-p290@global"
    MY_RUBY_HOME: "/home/nick/.rvm/rubies/ruby-1.9.2-p290"
    IRBRC:        "/home/nick/.rvm/rubies/ruby-1.9.2-p290/.irbrc"
    RUBYOPT:      ""
    gemset:       ""

but still gem env tells me that in the RubyGems Environment the Ruby version is 1.8.7. I just don't get it.

Answer 1

Make sure you didn't use sudo with RVM. I ran into an issue like this where I had 2 different locations for Ruby and my gems.

Answer 2

Man, I was having this exact problem and the way I solved it was by reinstalling bundler. It seems that bundler was caching the RUBY_VERSION to 1.8.7.

I'm not using rvm, I had to use this to set the default ruby version:

sudo update-alternatives --config ruby
sudo update-alternatives --config gem

And then, I reinstalled bundler and it worked!

Hopefully you can solve it with this approach

Answer 3

PATH is probably wrong - check printenv PATH