在脚本中安装gem之后，如何加载gem？ [英] After installing a gem within a script, how do I load the gem?

问题描述

我写了一个小的Ruby脚本来自动化本地机器上的开发环境。因为我不能确定所有机器上都存在 ruby​​zip2 库，所以我会在需要时安装它。

I have a small Ruby script that I'm writing to automate the preparation of a development environment on local machines. Because I can't be certain that the rubyzip2 library is present on all of the machines, I'm having the script install it when needed.

目前，我的脚本正在执行以下操作：

Currently, my script is doing the following:

begin
  require 'zip/zip'
rescue LoadError
  system("gem install rubyzip2")
end

一旦gem安装完成，脚本继续执行;然而，gem并没有被加载，所以所有需要 ruby​​zip2 的代码都暂停执行。

Once the gem has been installed, the script continues execution; however, the gem hasn't been loaded so all code requiring rubyzip2 halts the execution.

如何加载将宝石放入内存中以便脚本可以在安装后继续运行？

How do I load the gem into memory so that the script can continue running after installation?

推荐答案

使用 bundler 版本高于1.10（更新只是运行 gem install bundler ），您可以使用其新的'内联'功能，如 here 。

With bundler version higher than 1.10 (to update just run gem install bundler) you can use its new 'inline' feature as described here.

require 'bundler/inline'

gemfile(true) do
  source 'https://rubygems.org'
  gem 'catpix'
end

puts Catpix::VERSION

第一个参数 gemfile 方法是应该安装用户系统上尚未安装的gem。

First parameter of gemfile method is whether gems that aren't already installed on the user's system should be installed.

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