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PORails with Memcache returning wrong cached object?
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  1. PORails with Memcache returning wrong cached object?
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    copied!<p>I have a fairly large Rails app, which uses memcached on a seperate server as its cache store. </p> <p>The problem is that I randomly get errors in the production environment which <em>seem</em> to indicate that memcached is returning an incorrect object.</p> <p>Examples:</p> <p>In this example, <code>current_site</code> is a helper method which accesses a method on the <code>Site</code> model that uses Rails.cache to cache the model</p> <pre><code>ActionView::TemplateError in ListingsController#edit undefined method `settings' for #&lt;String:0xb565f8a0&gt; On line #12 of app/views/layouts/site.html.erb 9: &lt;meta name="robots" content="noodp, all" /&gt; 10: &lt;meta name="distribution" content="Global" /&gt; 11: 12: &lt;% unless current_site.settings[:google_webmaster_verification_code].blank? %&gt; 13: &lt;meta name="verify-v1" content="&lt;%= current_site.settings[:google_webmaster_verification_code] %&gt;" /&gt; 14: &lt;% end %&gt; 15: </code></pre> <p>contrasted with....</p> <pre><code>ActionView::TemplateError in ApplicationController#not_found undefined method `settings' for #&lt;Category:0xd5c6c34&gt; On line #12 of app/views/layouts/site.html.erb 9: &lt;meta name="robots" content="noodp, all" /&gt; 10: &lt;meta name="distribution" content="Global" /&gt; 11: 12: &lt;% unless current_site.settings[:google_webmaster_verification_code].blank? %&gt; 13: &lt;meta name="verify-v1" content="&lt;%= current_site.settings[:google_webmaster_verification_code] %&gt;" /&gt; 14: &lt;% end %&gt; 15: </code></pre> <p>When both should be returning a <code>Site</code> model!</p> <p>Another example of cache behaving strangely:</p> <pre><code>ActionView::TemplateError in AccountsController#show can't convert Category into String On line #141 of app/views/layouts/site.html.erb 138: &lt;li&lt;%= class="first" if i == 0 %&gt;&gt;&lt;%= link_to top_level_category.title, top_level_category.path %&gt;&lt;/li&gt;&lt;% end %&gt; 139: &lt;/ul&gt; 140: &lt;% end %&gt; 141: &lt;% cache bottom_pages do %&gt; 142: &lt;ul&gt;&lt;% Page.top_level.active.show_in_navigation.find(:all, :include =&gt; :slugs).each_with_index do |top_level_page, i| %&gt; 143: &lt;li&lt;%= class="first" if i == 0 %&gt;&gt;&lt;%= link_to top_level_page.title, top_level_page.path %&gt;&lt;/li&gt;&lt;% end %&gt; 144: &lt;/ul&gt; </code></pre> <p>Has anyone encountered something like this before? Anyone have thoughts on diagnosing this unreplicable problem!? I've tried switching out memcached client gems, thinking maybe it was a weird bug, but this didn't have any effect! Thanks.</p>
 

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