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    <p>The use of <code>File.join()</code> is wrong. <code>.join()</code> returns a string, and then applying <code>.last</code> to it generates an error, because there is no <code>.last</code> method for String objects.</p> <pre><code>pry(main)&gt; extension = '.xml' =&gt; ".xml" pry(main)&gt; File.join(extension).last NoMethodError: undefined method `last' for ".xml":String </code></pre> <p>Instead you need to pass an array of path elements you want to join into a path to a file:</p> <pre><code>pry(main)&gt; File.join('.', 'path', 'to', 'a', 'file.ext') =&gt; "./path/to/a/file.ext" </code></pre> <p>or:</p> <pre><code>pry(main)&gt; File.join('/', 'path', 'to', 'a', 'file.ext') =&gt; "/path/to/a/file.ext" </code></pre> <p>Take the time to read about Ruby's <a href="http://ruby-doc.org/core-1.9.3/File.html" rel="nofollow"><code>File</code></a> class. It allows you to work with the files and paths in a fairly OS-independent way.</p> <p>Its <code>dirname</code>, <code>basename</code>, and <code>extname</code> methods are convenient when dissecting paths:</p> <pre><code>pry(main)&gt; File.dirname('/path/to/a/file.ext') =&gt; "/path/to/a" pry(main)&gt; File.basename('/path/to/a/file.ext') =&gt; "file.ext" pry(main)&gt; File.extname('/path/to/a/file.ext') =&gt; ".ext" </code></pre> <p>There's also the <code>split</code> method which combines <code>dirname</code> and <code>basename</code>, returning both the path and "filename.ext" allowing you to use parallel assignment:</p> <pre><code>pry(main)&gt; dirname, filename = File.split('/path/to/a/file.ext') =&gt; ["/path/to/a", "file.ext"] </code></pre> <p><code>File.basename</code> takes an optional "extension" parameter, allowing it to strip off an extension:</p> <pre><code>pry(main)&gt; File.basename('/path/to/a/file.ext', '.ext') =&gt; "file" </code></pre> <p>Combine all that magical goodness and you can fold, spindle and mutilate your filenames and paths all day long.</p>
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    1. POHow do I add an extension to a file when downloading it?
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    1. USthe Tin Man
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      1. VTUpMod
    1. CO+1 for teaching us both something :)
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      1. USIoannis Karadimas
 

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