三平方米-红宝石不见了。但不是真的

Question

背景细节:我在Ubuntu12.04中运行Ruby2.2.0和Rails 4.1.0。

当我输入rails -v时，我会得到错误消息：

Could not find gem 'sqlite3-ruby (= 1.3.1) ruby' in the gems available on this machine.
Try running `bundle install`.

当我输入bundle install时：

我得到：

Fetching gem metadata from http://rubygems.org/...........
Fetching version metadata from http://rubygems.org/..
Resolving dependencies...
Bundler could not find compatible versions for gem "bundler":
  In Gemfile:
    rails (= 3.0.1) ruby depends on
      bundler (~> 1.0.0) ruby

  Current Bundler version:
    bundler (1.8.4)

This Gemfile requires a different version of Bundler.
Perhaps you need to update Bundler by running `gem install bundler`?

最糟糕的是，它仍然显示Rails (3.0.1)，这不是我的计算机上rails的当前版本。

我试图通过键入以下命令安装sqllite3-ruby：

sudo apt-get install libsqlite3-dev

但我明白：

Reading package lists... Done
Building dependency tree       
Reading state information... Done
libsqlite3-dev is already the newest version.
The following packages were automatically installed and are no longer required:
  ruby-builder ruby-blankslate ruby-text-format ruby-activesupport-2.3 rubygems ruby-i18n rake libjs-prototype libmemcache-client-ruby1.8
  ruby-actionmailer-2.3 libmemcache-client-ruby ruby-activerecord-2.3 ruby-rchardet ruby-rack ruby-tmail libjs-scriptaculous libtzinfo-ruby1.8
  ruby-rails-2.3 ruby-activeresource-2.3 libtzinfo-ruby ruby-actionpack-2.3
Use 'apt-get autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 455 not upgraded.

更新：

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Answer 1

检查Gemfile中的rails版本。您的应用程序似乎是用rails 3.0.1构建的。因此，bundle install希望安装Gemfile中所要求的所有gem版本。正如您的终端中的消息所述，rails 3.0.1依赖于bundler 1.0.0，但您目前已安装了bundler 1.8.4。

Yo有两种可能性:要么将你现有的应用升级到完整的rails版本(4.2.0)，要么将所有安装的依赖于rails的gems降级为rails 3.0.1。