Ruby on rails 无法仅通过cap找到RubyGem bundler

这是针对rails的my forst部署试用版

我设法在服务器端设置了所有依赖项

我打字的时候

bundle exec rails console

一切正常。我在运行cap部署时遇到了一个奇怪的问题：本地迁移

[.com] sh -c 'cd /home//.com/releases/20120411120423 && bundle     install --gemfile /home//.com/releases/20120411120423/Gemfile --path /home//.com/shared/bundle --deployment --quiet --without development test'
** [out ::.com] /usr/lib/ruby/1.8/rubygems.rb:779:in `report_activate_error':     Could not find RubyGem bundler (>= 0) (Gem::LoadError
** [out ::.com] )
** [out ::.com] from /usr/lib/ruby/1.8/rubygems.rb:214:in `activate'
** [out ::.com] from /usr/lib/ruby/1.8/rubygems.rb:1082:in `gem'
** [out ::.com] from /home//.gems/bin/bundle:18
command finished in 539ms

当我手动复制命令并在服务器上执行它时，它工作得非常好

这是我的deploy.rb文件

require "bundler/capistrano"

default_run_options[:pty] = true
set :user, 'xyz'
set :domain, 'xyz.com'
set :application, 'xyz'

set :repository,  "#{user}@#{domain}:git/#{application}.git"
set :deploy_to, "/home/#{user}/#{domain}"
set :deploy_via, :remote_cache
set :scm, 'git'
set :branch, 'master'
set :git_shallow_clone, 1
set :scm_verbose, true
set :use_sudo, false

set :rake, "/home//.gems/bin/rake"

server domain, :app, :web
role :db, domain, :primary => true

namespace :deploy do
  task :restart do
  run "touch #{current_path}/tmp/restart.txt"
   end
end

更新：

当我从cap启动包-v时，我得到了正确的位置

$ cap invoke COMMAND="which bundle"

输出

 /home//.gems/bin/bundle

---

将这些行添加到config.ru文件解决了这个问题

ENV['GEM_HOME'] = '/home/aaalsubaie/.gems/'
ENV['GEM_PATH'] = '/usr/lib/ruby/gems/1.8'

require 'rubygems'
Gem.clear_paths

---

顺便说一下，我搜索了很多问题，但没有人帮我：（这太重要了。