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- <title>Bundler: The best way to manage a Ruby application's gems</title>
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- <h2>Specifying a Ruby Version</h2>
- <div class='contents'>
- <div class='bullet'>
- <div class='description'>
- Like gems, developers can setup a dependency on Ruby. This makes your app fail faster in case you depend on specific features in a Ruby VM. This way, the Ruby VM on your deployment server will match your local one. You can do this by using the <code>ruby</code> directive in the <code>Gemfile</code>:
- </div>
- <pre class="highlight ruby"><span class="n">ruby</span> <span class="s1">'RUBY_VERSION'</span><span class="p">,</span> <span class="ss">:engine</span> <span class="o">=&gt;</span> <span class="s1">'ENGINE'</span><span class="p">,</span> <span class="ss">:engine_version</span> <span class="o">=&gt;</span> <span class="s1">'ENGINE_VERSION'</span><span class="p">,</span> <span class="ss">:patchlevel</span> <span class="o">=&gt;</span> <span class="s1">'RUBY_PATCHLEVEL'</span>&#x000A;</pre>
- </div>
- <div class='bullet'>
- <div class='description'>
- If you wanted to use JRuby 1.6.7 using Ruby 1.9.3, you would simply do the following:
- </div>
- <pre class="highlight ruby"><span class="n">ruby</span> <span class="s1">'1.9.3'</span><span class="p">,</span> <span class="ss">:engine</span> <span class="o">=&gt;</span> <span class="s1">'jruby'</span><span class="p">,</span> <span class="ss">:engine_version</span> <span class="o">=&gt;</span> <span class="s1">'1.6.7'</span>&#x000A;</pre>
- </div>
- <div class='bullet' id='patchlevel'>
- <div class='description'>
- It's also possible to restrict the patchlevel of the Ruby used by doing the following:
- </div>
- <pre class="highlight ruby"><span class="n">ruby</span> <span class="s1">'1.9.3'</span><span class="p">,</span> <span class="ss">:patchlevel</span> <span class="o">=&gt;</span> <span class="mi">448</span>&#x000A;</pre>
- </div>
- <div class='bullet'>
- <div class='description'>
- Bundler will make checks against the current running Ruby VM to make sure it matches what is specified in the <code>Gemfile</code>. If things don't match, Bundler will raise an Exception explaining what doesn't match.
- </div>
- <pre class="highlight plaintext">Your Ruby version is 1.8.7, but your Gemfile specified 1.9.3&#x000A;</pre>
- </div>
- <div class='bullet'>
- <div class='description'>
- Both <code>:engine</code> and <code>:engine_version</code> are optional. When these options are omitted, this means the app is compatible with a particular Ruby ABI but the engine is irrelevant. When <code>:engine</code> is used, <code>:engine_version</code> must also be specified.
- </div>
- </div>
- <div class='bullet'>
- <div class='description'>
- Using the <code>platform</code> command with the <code>--ruby</code> flag, you can see what <code>ruby</code> directive is specified in the <code>Gemfile</code>.
- </div>
- <pre class="highlight plaintext">ruby 1.9.3 (jruby 1.6.7)</pre>
- <a href="/v1.5/bundle_platform.html">Learn More: bundle platform</a>
- </div>
- <div class='bullet'>
- <div class='description'>
- In the <code>ruby</code> directive, <code>:patchlevel</code> is optional, as patchlevel releases are usually compatible and include important security fixes. The patchlevel option checks the <code>RUBY_PATCHLEVEL</code> constant, and if not specified then bundler will simply ignore it.
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