从 Rails 中确定 ruby 版本
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Determine ruby version from within Rails
提问by Daniel Vandersluis
Is there a way to determine what version of Ruby is running from within Rails (either on the web or through script/console)? I have Ruby 1.8.6 installed but I've also installed Ruby Enterprise Edition 1.8.7-20090928 and want to ensure that it's using the right installation.
有没有办法确定从 Rails 内部（在 Web 上或通过script/console）运行的 Ruby 版本？我安装了 Ruby 1.8.6，但我也安装了 Ruby Enterprise Edition 1.8.7-20090928，并希望确保它使用正确的安装。
回答by avguchenko
Use the Top-Level Constant
使用顶级常量
RUBY_VERSION
other useful Top-Level Constants are
其他有用的顶级常量是
RUBY_PATCHLEVEL
RUBY_PLATFORM
RUBY_RELEASE_DATE
here is an irb session:
这是一个 irb 会议：
irb(main):001:0> RUBY_VERSION
=> "1.8.7"
回答by Mark Westling
Try the constant RUBY_VERSION. I use this extensively to determine whether I'm running under 1.8 or JRuby.
试试常量 RUBY_VERSION。我广泛使用它来确定我是在 1.8 还是 JRuby 下运行。
Also, if you're not in production mode, you can do a quick check by hitting the URL "/rails/info/properties"
此外，如果您未处于生产模式，则可以通过点击 URL“/rails/info/properties”进行快速检查
回答by averell
In addition to the RUBY_VERSION constant and friends you may also want to check out Config::CONFIG. This hash contains not only the version numbers but also a ton of other useful runtime information, like the path to the binary, the hostname, ...
除了 RUBY_VERSION 常量和朋友，您可能还想查看 Config::CONFIG。该散列不仅包含版本号，还包含大量其他有用的运行时信息，例如二进制文件的路径、主机名……
回答by KomodoDave
Use RUBY_VERSIONas mentioned by others.
使用RUBY_VERSION其他人提到的。
You can then use Gem::Versionto do version string comparison:
然后您可以使用Gem::Version进行版本字符串比较：
require 'rubygems' # Only needed for ruby pre-1.9.0 but it's safe for later versions (evaluates to false).
if Gem::Version.new(RUBY_VERSION) < Gem::Version.new('1.9.0')
extend DL::Importable
else
extend DL::Importer
end
