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    <p><strong>TL;DR</strong></p> <ul> <li><p>put this in <em>config/application.rb</em></p> <p><code>config.eager_load_paths += ["#{Rails.root}/lib"]</code></p></li> <li><p>remove <code>require</code> statements for your <em>lib</em> files</p></li> </ul> <p>Go!</p> <hr> <p>Let me explain in detail.</p> <p>I don't know why this answer is accepted, since it doesn't help with <strong>reloading lib folder on each request</strong>. First I thought that it works for Rails 2, but the question clearly states that it was for Rails 3 and the release date of 3.0.0 is before the date of the answer.</p> <p>Other answers seem over-complicated or don't provide a real solution.</p> <p>I decided to investigate things a little, because it was bothering me and I've even found out that people have a workaround for this and it involves saving lib files inside <code>app/models</code> in development and then moving it to <code>/lib</code> when done. We can do better, right?</p> <hr> <p>My solution is tested against:</p> <ul> <li>Rails 3.0.20</li> <li>Rails 3.1.12</li> <li>Rails 3.2.13</li> <li>Rails 4.0.0.rc1</li> </ul> <p>Put this into your <code>config/application.rb</code>:</p> <pre><code># in config/application.rb config.eager_load_paths += ["#{Rails.root}/lib"] </code></pre> <p><em>That's it!™</em></p> <p>Make sure you put it here since it will <strong>not work</strong> if you put it in <code>config/environments/development.rb</code>, for example.</p> <p>Make sure your remove all the <code>require</code> statements for your <code>/lib</code> code since <code>require</code> statements will also cause this solution to not work.</p> <hr> <p>This code implicitly requires your code, so if you do environment checks (which are unnecessary) and instead of the above code, you decide to write something like this:</p> <pre><code># in config/application.rb config.eager_load_paths += ["#{Rails.root}/lib"] if Rails.env.development? </code></pre> <p>you should watch out on the old <code>require</code> statements, since they are still required on all the non-development environments, in this scenario.</p> <p>So if you still decide to do environment checks, make sure you do inverse checks for require statements. Otherwise you'll get bitten!</p> <pre><code>require "beer_creator" unless Rails.env.development? </code></pre> <p>You might think that writing entire paragraph about something that's unnecessary is also unnecessary, but I think that warning people about something that's necessary when doing something unnecessary is also necessary.</p> <p>If you would like to know more about this topic, check out <a href="https://gist.github.com/shime/6696842" rel="nofollow noreferrer">this little tutorial</a>.</p>
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    1. PORuby on Rails 3 - Reload lib directory for each request
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    1. USshime
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    1. COThat was a while back buck you can also use load without the eager_load_path. Create helper that take the string as a parameter and use load if env is dev and require if env is prod. If you try that please let me know if it works :)
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      1. USNicolas Guillaume
    2. CODoesn't seem to work on Rails 3.0.20 with or without the extra '}' at the end of the string.
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    3. COThis didn't work for me on 3.2.13 -- instead, after adding the eager_load_paths, all my other files (controllers + models) stopped getting reloaded between requests also! (Goes back to normal if I remove that line.) Bizarre. I finally got it working with this answer: http://stackoverflow.com/a/10954365/1164573
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      1. USSherwin Yu
 

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