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<title>Bundler: The best way to manage a Ruby application's gems</title>
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<a class="image" href="/"><img width="725" alt="The best way to manage your application's dependencies" src="/images/gembundler.png" /></a>
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<h2>Using Bundler with Rubygem gemspecs</h2>
<div class='contents'>
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<div class='description'>
If you're creating a gem from scratch, you can use bundler's built in gem skeleton to create a base gem for you to edit.
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<div class='how'>
<pre class="highlight plaintext">$ bundle gem my_gem</pre>
<div class='notes'>
This will create a new directory named <code>my_gem</code> with your new gem skeleton.
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If you already have a gem with a gemspec, you can generate a Gemfile for your gem.
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<pre class="highlight plaintext">$ bundle init</pre>
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Then, add the following to your new Gemfile
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<pre class="highlight ruby"><span class="n">gemspec</span>
</pre>
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Runtime dependencies in your gemspec are treated like base dependencies, and development dependencies are added by default to the group, <code>:development</code>. You can change that group with the <code>:development_group</code> option
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<pre class="highlight ruby"><span class="n">gemspec</span> <span class="ss">:development_group</span> <span class="o">=></span> <span class="ss">:dev</span>
</pre>
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<div class='description'>
As well, you can point to a specific gemspec using <code>:path</code>. If your gemspec is in <code>/gemspec/path</code>, use
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<pre class="highlight ruby"><span class="n">gemspec</span> <span class="ss">:path</span> <span class="o">=></span> <span class="s1">'/gemspec/path'</span>
</pre>
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If you have multiple gemspecs in the same directory, specify which one you'd like to reference using <code>:name</code>
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<pre class="highlight ruby"><span class="n">gemspec</span> <span class="ss">:name</span> <span class="o">=></span> <span class="s1">'my_awesome_gem'</span></pre>
<div class='notes'>
This will use <code>my_awesome_gem.gemspec</code>
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That's it! Use bundler when developing your gem, and otherwise, use gemspecs normally!
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<pre class="highlight plaintext">$ gem build my_gem.gemspec</pre>
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