Gem installed, but not found by Ruby? - bash

Question

I have the following Capistrano snippet:
namespace :bundle do
task :install do
run "gem list && bundle -v"
end
end
When I run
cap bundle:install
I get the following output:
** [out :: ....compute-1.amazonaws.com]
** [out :: ....compute-1.amazonaws.com] *** LOCAL GEMS ***
** [out :: ....compute-1.amazonaws.com]
** [out :: ....compute-1.amazonaws.com]
** [out :: ....compute-1.amazonaws.com] bundler (1.3.4)
** [out :: ....compute-1.amazonaws.com] rake (10.0.3)
** [out :: ....compute-1.amazonaws.com] rubygems-bundler (1.1.1)
** [out :: ....compute-1.amazonaws.com] rvm (1.11.3.6)
** [out :: ....compute-1.amazonaws.com]
** [out :: ....compute-1.amazonaws.com] ERROR: Gem bundler is not installed, run `gem install bundler` first.
gem is showing bundler is installed, but when I try to run bundle -v, I get a contradicting error saying it's not? I don't understand why?
The other thing I tried was to login to the server via terminal, when I run bundle -v there, it works fine?
Any ideas what's wrong?

Answer 1

do you use rvm-capistrano gem? It will load RVM for you.

Answer 2

I managed to get my script working by adding some environment variables:
set :default_environment, {
:PATH => "/home/ubuntu/.rvm/gems/ruby-1.9.2-p320#my_gemset/bin:" +
"/home/ubuntu/.rvm/gems/ruby-1.9.2-p320#global/bin:" +
"/home/ubuntu/.rvm/rubies/ruby-1.9.2-p320/bin:" +
"/home/ubuntu/.rvm/bin:" +
"/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin",
:RUBY_VERSION => 'ruby-1.9.2-p320',
:GEM_HOME => '/home/ubuntu/.rvm/gems/ruby-1.9.2-p320#my_gemset',
:GEM_PATH => '/home/ubuntu/.rvm/gems/ruby-1.9.2-p320#my_gemset:/home/ubuntu/.rvm/gems/ruby-1.9.2-p320#global'
}