blocks|key|1103438|text|如果您查看依赖性，没有一个选择的红宝石版本。如果用户使用ruby1.9，也许可以使用post_install_message属性来告诉用户安装gem。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1103439|entityMap|0|LINK|mutability|MUTABLE|url|http://rubygems.rubyforge.org/rdoc/Gem/Specification.html#M000600^0|5|3|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

If you look at the <a href="http://rubygems.rubyforge.org/rdoc/Gem/Specification.html#M000600" rel="nofollow noreferrer">gemspec documentation for add_dependency</a>, there isn't an option for a ruby version. Perhaps you could use the post_install_message attribute to tell the user to install the gem if they're using ruby 1.9.

blocks|key|2628034|text|我为一个项目做了这件事。诀窍是将脚本添加为扩展名，然后在用户的机器上安装时执行该脚本。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2628035|下面是我们的github的代码片段和链接：|2628036|首先，在gemspec中(我们实际上使用Rakefile来生成它，但结果是相同的)+来源|offset|length|2628037|#+This+file+*needs*+to+be+named+this,+there+are+other+files+
#++for+other+extension+processors
s.extensions+<<+'ext/mkrf_conf.rb'|code-block|syntax|javascript|2628038|然后是mkrf_conf.rb+来源中的相关行|2628039|require+'rubygems/dependency_installer.rb'+
inst+=+Gem::DependencyInstaller.new
inst.install+"test-unit"+if+RUBY_VERSION+>+"1.9"|2628040|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/openshift/os-client-tools/blob/master/express/Rakefile#L42|1|https://github.com/openshift/os-client-tools/blob/master/express/ext/mkrf_conf.rb^0|0|0|16|2|0|0|0|G|2|1|0|0^^$0|@$1|2|3|4|5|6|7|10|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|11|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|12|8|@]|9|@$F|13|G|14|1|15]]|A|$]]|$1|H|3|I|5|J|7|16|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|17|8|@]|9|@$F|18|G|19|1|1A]]|A|$]]|$1|O|3|P|5|J|7|1B|8|@]|9|@]|A|$K|L]]|$1|Q|3|-4|5|6|7|1C|8|@]|9|@]|A|$]]]|R|$S|$5|T|U|V|A|$W|X]]|Y|$5|T|U|V|A|$W|Z]]]]

I did this exact thing for a project. The trick is to add the script as an extension, which will then get executed at install time on the user's machine.

Here are code snippets and links to our github:

First, when in the gemspec (we're actually using a Rakefile to generate it, but the result ends up the same) <a href="https://github.com/openshift/os-client-tools/blob/master/express/Rakefile#L42" rel="nofollow">source</a>

<pre><code># This file *needs* to be named this, there are other files 
# for other extension processors
s.extensions &lt;&lt; 'ext/mkrf_conf.rb'
</code></pre>

And then the relevant lines in that mkrf_conf.rb <a href="https://github.com/openshift/os-client-tools/blob/master/express/ext/mkrf_conf.rb" rel="nofollow">source</a>

<pre><code>require 'rubygems/dependency_installer.rb' 
inst = Gem::DependencyInstaller.new
inst.install "test-unit" if RUBY_VERSION &gt; "1.9"
</code></pre>

blocks|key|1103485|text|Gem不支持条件依赖(除了上面提到的创业板构建器环境-as+)，而且邦德勒也不是解决这个问题的可行选择--参见https://github.com/carlhuda/bundler/issues/1281|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1103486|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/carlhuda/bundler/issues/1281^0|1J|1B|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

Gem doesn't support conditional dependencies (except on gem builder's environment -as noted above), and bundler is not a viable option to solve this either - see <a href="https://github.com/carlhuda/bundler/issues/1281" rel="nofollow">https://github.com/carlhuda/bundler/issues/1281</a>

blocks|key|2627831|text|干草。我有点像红宝石新手..。如果这是最好的方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2627832|无论如何..。我真希望我能只用Ruby+.尽管您可以使用操作系统外壳来完成这一任务，但是通过在程序安装程序中使用它，只需执行(适用于基于Linux的操作系统)：|2627833|$ruby+--version|code-block|syntax|javascript|2627834|(您可以像：ruby+--version一样从ruby安装程序文件中执行此操作)，并根据输出添加一个额外行来执行：|offset|length|style|CODE|2627835|$+sudo+gem+install+gem_name|2627836|不然的话，就别管它了。|2627837|entityMap^0|0|0|0|6|E|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|W|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|X|8|@$K|Y|L|Z|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|10|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|11|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|12|8|@]|9|@]|A|$]]]|T|$]]

hay ... i'm kind of a ruby newbie ... if this is the best way to do it.

any way ... i wish i can do that using only Ruby .... though u can use your operating system shell to do that, by using this in your program installer, just execute (works for Linux based operating systems):

<pre><code>$ruby --version
</code></pre>

(u can execute that from a ruby installer file, just like: <code>ruby --version</code>)
and put a possibility according to output, if it's 1.9.1 add an extra line to execute:

<pre><code>$ sudo gem install gem_name
</code></pre>

else, just leave it be.

blocks|key|2627982|text|在Ruby编程wikibook中查看本教程。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|2627983|Tt展示了如何安装不同版本的依赖项，具体取决于安装程序使用的ruby版本。|2627984|(简短的回答-不像应该的那样容易)|2627985|entityMap|0|LINK|mutability|MUTABLE|url|https://en.wikibooks.org/wiki/Ruby_Programming/RubyGems^0|1|E|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]]|C|$]]|$1|D|3|E|5|6|7|T|8|@]|9|@]|C|$]]|$1|F|3|G|5|6|7|U|8|@]|9|@]|C|$]]|$1|H|3|-4|5|6|7|V|8|@]|9|@]|C|$]]]|I|$J|$5|K|L|M|C|$N|O]]]]

Checkout this tutorial in the <a href="https://en.wikibooks.org/wiki/Ruby_Programming/RubyGems" rel="nofollow noreferrer">Ruby Programming wikibook</a>.

Tt shows how to install different versions of dependencies depending on what version of ruby the installee is using.

(short answer--it ain't as easy as it should be)

blocks|key|2627885|text|你不能。你需要建造两颗宝石，一颗用|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2627886|spec.required_ruby_version+=+'~>+1.8.6'|code-block|syntax|javascript|2627887|还有一个|2627888|spec.required_ruby_version+=+'~>+1.9.1'
spec.add_dependency+'test-unit',+'~>+2.0.5'|2627889|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|N|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|O|8|@]|9|@]|A|$]]|$1|I|3|J|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|K|3|-4|5|6|7|Q|8|@]|9|@]|A|$]]]|L|$]]

You can't. You need to build two gems, one with

<pre><code>spec.required_ruby_version = '~&gt; 1.8.6'
</code></pre>

and one with

<pre><code>spec.required_ruby_version = '~&gt; 1.9.1'
spec.add_dependency 'test-unit', '~&gt; 2.0.5'
</code></pre>

blocks|key|1082134|text|Gemspecs只是ruby文件，所以您可以在其中执行任何ruby代码，因此：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1082135|spec.add_dependency+=+'test-unit',+'>=+2.0'+if+RUBY_VERSION+=~+'1.9'+|code-block|syntax|javascript|1082136|编辑:规范只运行在建设者机器上。|1082137|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

Gemspecs are just ruby files anyway, so you can execute any ruby code inside them, so:

<pre><code>spec.add_dependency = 'test-unit', '&gt;= 2.0' if RUBY_VERSION =~ '1.9' 
</code></pre>

EDIT: Specs run only on the builders machine.

Is it possible to add a gem dependency only if the person is using a certain version of ruby?

Background: I'm working on a <a href="http://github.com/agrimm/chaser" rel="nofollow noreferrer">fork of a project</a> that uses Test::Unit::Autorunner and the like. They are part of the standard library in ruby 1.8, but aren't part of the standard library in 1.9.1, and is instead in the "test-unit" gem. I want to add a dependency that says that if someone's using ruby 1.9.1 or later, install the "test-unit" gem, but if they're using 1.8 or earlier, they don't need to install anything.

How do I add conditional rubygem requirements to a gem specification?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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只有当用户使用特定版本的ruby时，才有可能添加宝石依赖项吗？背景：，我正在开发一个使用Test::Unit::Autorunner等的。它们是ruby 1.8标准库的一部分，但在1.9.1中不是标准库的一部分，而是在“测试单元”gem中。我想添加一个依赖项，如果有人使用ruby 1.9.1或更高版本，安装“测试单元”gem，但如果他们使用1.8或更高版本，他们不需要安装任何东西。

问如何向gem规范中添加条件rubygem要求？
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