ruby：代码安装宝石如果丢失 [英] ruby: code to install gem if missing

问题描述

是否有一些ruby代码可用于从本地文件安装gem，如果该gem没有安装？

is there some ruby code I can use to install a gem from a local file, if that gem is not installed?

我认为它会看起来像例如：

i'm thinking it would look something like:

if !gem_installed("some gem name")
  system "gem install -l local_copy.gem"
end

我不知道是否有任何东西让我检查这样的宝石或不... ...

i don't know if anything exists that lets me check for gems like this or not...

推荐答案

检查可用性包含在上一个StackOverflow Quesiton

begin
  gem "somegem"
  # with requirements
  gem "somegem", ">=2.0"
rescue Gem::LoadError
  # not installed
end

或

matches = Gem.source_index.find_name(gem.name, gem.version_requirements)

至于安装，它看起来像 rails使用系统进行gem install也是

As for the install, it looks like rails uses the system for gem install also

 puts %x(#{cmd})

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