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    <p>Overall: Its a regression with Sprockets 2. Read on for an explanation and solution.</p> <h3>How Debugging works internally</h3> <p>Assume you have a file called <code>vendor.js</code> with the following:</p> <pre><code># vendor.js //= require jquery //= require knockout //= ... some more requires function one() { } function two() { } // and some javascript code </code></pre> <p>First, let's see what the Asset Debugging does:</p> <ol> <li><p>Places a single <code>&lt;script src="vendor.js"&gt;</code> tag if debugging is disabled,</p> <p>(or)</p> <p>Places multiple <code>&lt;script src="vendor.js?body=1"&gt;, &lt;script src="jquery.js?body=1"&gt;, &lt;script src="knockout.js?body=1"&gt;, ...</code> when debugging is enabled</p></li> <li><p>The <code>body=1</code> is also an integral part of debugging. If you say <code>&lt;script src="vendor.js?body=1"&gt;</code> - it <em>only</em> renders the javascript inside <code>vendor.js</code>. It doesn't include any of the other <code>require ...</code> code.</p> <p>But if you hit <code>vendor.js</code> alone, without the <code>?body=1</code>, it includes all the <code>require ...</code> code as well.</p></li> </ol> <p>So a combination of the above two produce the necessary debugging output. What we want to do is, when we say <code>javascript_include_tag "vendor", :debug =&gt; false</code>, we want a single <code>&lt;script src="vendor.js"&gt;</code> tag with <em>NO</em> <code>?body=1</code> appended.</p> <h3>Explaining the Regression</h3> <p><a href="https://github.com/rails/sprockets-rails/blob/b522561d2d83b83c99e9aa54c8079fd1241fdf49/lib/sprockets/rails/helper.rb#L88" rel="noreferrer">The regressed code is here</a>. Specifically the buggy code is this one statement:</p> <pre><code>L88. if request_debug_assets? </code></pre> <p>Its checking request_debug_assets?, and then automatically setting <code>:debug =&gt; true</code> <a href="https://github.com/rails/sprockets-rails/blob/b522561d2d83b83c99e9aa54c8079fd1241fdf49/lib/sprockets/rails/helper.rb#L92" rel="noreferrer">further in line #92</a>. But <code>request_debug_assets?</code> is returning true, because that is being set at the application configuration level.</p> <p>This one statement should have ideally been:</p> <pre><code>L88. if request_debug_assets? &amp;&amp; options["debug"] != false </code></pre> <h3>Solution / Patch</h3> <p>I'll raise a pull request for the same, but until the pull request is reviewed and merged, you can do the following in an initializer:</p> <pre><code># config/initializers/sprockets_debug_patch.rb module Sprockets::Rails::Helper def javascript_include_tag(*sources) options = sources.extract_options!.stringify_keys # CHECK options["debug"] as well, not just the global assets.debug if request_debug_assets? &amp;&amp; options["debug"] != false # REST ALL SAME CODE AS ORIGINAL METHOD </code></pre> <p>Do the same for <code>stylesheet_include_tag</code> as well. Unfortunately there is no better way than copy/pasting the method code, but this resolves the problem.</p> <p>Throughout <code>Sprockets::Rails::Helper</code> class, you will find that it says <em>all this will be deprecated in Sprockets 3.x</em>. I don't know if Rails 4 is scheduled to ship with Sprockets 3.x. If so, then these patches might end up not being required.</p>
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    1. COThanks! I'll give it a try in the next couple of days. I thought that this has to be some kind of a bug. Can you also provide the url for the issue so i could watch it?
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    2. CO@JarmoPertman, [raised issue #68](https://github.com/rails/sprockets-rails/issues/68) under sprockets-rails. The above patch will work meanwhile, until the issue is resolved...
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    3. COThis issue is fixed in sprockets-rails 2.0.1, but the current rails 4.0.1 still declares a squiggly dependency on 2.0.0, so you may no get it. To force 2.0.1 use "gem 'sprockets-rails', '~> 2.0.1'".
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