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PORails 3.1 Not Reloading Changed Views
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copied!<p>I'm seeing a bug/feature in my Ruby 1.9.2 applications. Any changes to <strong>views</strong> (not ruby files) require a server restart. I initially encountered this in a Rails app, but I've tested the same thing in a minimal Sinatra app too.</p> <p>I'll include a simple app to demonstrate</p> <pre><code># testapp.rb require 'sinatra' get '/' do [0,1,2].to_s #change this to [0,1].to_s end </code></pre> <p>This is my procedure:</p> <ul> <li><code>ruby testapp.rb</code> (runs thin server for me)</li> <li>load the page</li> <li>open the file and edit the view</li> <li>reload the page (I see no changes)</li> <li>kill the server</li> <li>restart the server (changes now visible)</li> </ul> <p>I've been developing in Ruby 1.8.7 on Rails 3 for the last several months. Having to restart the server on any view change slows down development severely.</p> <p>I've ready <a href="https://stackoverflow.com/questions/5027327/rails-development-environment-not-reloading-views-on-change">this SO thread</a>, but in my version of Rails (3.1.0 rc4), the config variable is already set as per that answer. Additionally I can replicate the error using Sinatra, so that doesn't seem like it's the case.</p> <p>Can anyone shed light on this issue?</p> <p>Ruby version: ruby 1.9.2p180 (2011-02-18 revision 30909) [x86_64-linux] Server: thin 1.2.11 (also tested this with Sinatra/Webrick)</p> <p><strong>EDIT 7/13, Clarification</strong> The Sinatra thing is a separate issue--Sinatra's source reloading is disabled by default. I used this code to test out the behavior:</p> <pre><code>require 'sinatra' require 'sinatra/reloader' require 'haml' set :views, 'views' get '/' do end get '/test' do haml :test end </code></pre> <p>With this, I made a file: <code>views/test.haml</code>. Modifying it while the server is running <strong>does</strong> show a change when the page is reloaded. Thanks to Tiredpixel for pointing this out</p> <p><strong>Unresolved Issue</strong>: why does Rails 3.1 on Ruby 1.9.2 not reload the <strong>views</strong>? I'm able to get ruby files to load, but not haml and erb files. I end up restarting the server just to see if a bug was actually fixed (or not fixed) because of a file not loading properly.</p> <p><strong>EDIT/SOLUTION (copied from my comment in the accepted answer)</strong>:</p> <p>The problem was in <code>config/environments/development.rb</code></p> <pre><code>config.cache_classes = false </code></pre> <p>Even after we checked this was correct, we still had the issue. Further down in the file we had: </p> <pre><code>config.threadsafe! </code></pre> <p>What this does is set the following 3 flags to true: <code>config.allow_concurrency</code>, <code>config.preload_frameworks</code>, and (surprise!) <code>config.cache_classes</code>.</p> <p>To fix: move <code>config.threadsafe!</code> above <code>config.cache_classes</code>, so that it doesn't get implicitly overridden.</p>

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