Integrating Jekyll with FeedBurner

It’s relatively easy to get the feed for your Jekyll site running on FeedBurner. Firstly, you need to choose a subdirectory to host your feed on. Calling it feed seems to be a fairly popular choice, so I decided to follow the crowd. Create a folder called feed at the base of your Jekyll site, and create an index.xmlfile inside with the following contents (obviously swapping the references to Recursive for your own site details) : ...

September 14, 2010 · 3 min · Dave Perrett

Installing git-up on Ubuntu 8.10

Recently I had a bit of trouble getting {{ “” | ext_link: “git-up”}} to work on Ubuntu (or anywhere else for that matter), so here’s some of the steps I had to go through. Initially ubuntu seems to have RubyGems 1.01 and 1.2.0 installed : > gem --version 1.2.0 >/usr/bin/gem1.8 --version 1.2.0 >/usr/bin/gem1.9 --version 1.0.1 ...

February 14, 2010 · 2 min · Dave Perrett

Updating RubyGems on Mac OS X 10.5 Leopard

I haven’t used ruby for a while, but recently wanted to try out {{ “” | ext_link: “git-up”}} on OSX. According to the {{ “” | ext_link: “instructions”}}, a simple gem install git-up should work : > sudo gem install git-up Updating metadata for 1 gems from . complete ERROR: could not find git-up locally or in a repository I assume this is something to do with gem hosting moving to github or something… I haven’t really been following ruby for a year or so so I’m not sure exactly what’s going on. It seems i’m running a pretty old version of RubyGems, so I tried to update : ...

February 14, 2010 · 2 min · Dave Perrett

'spec/rake/spectask' errors doing rake db:migrate

If you get an error similar to the following while running rake db:migrate : error no such file to load -- spec/rake/spectask … you need to install the rspec gem : > sudo gem install rspec

April 29, 2009 · 1 min · Dave Perrett

'Can't find Magick-config' error installing rmagick gem

If you are getting the error ‘Can’t find Magick-config’ when installing the RMagick gem, chances are you’re missing the libmagick9-dev library. /opt/ruby-enterprise-1.8.6-20090201/bin/ruby extconf.rb install rmagick checking for Ruby version >= 1.8.2... yes checking for gcc... yes checking for Magick-config... no Can't install RMagick 2.9.1. Can't find Magick-config in ..... To fix this on ubuntu, simply install libmagick : apt-get install libmagick9-dev

April 26, 2009 · 1 min · Dave Perrett

undefined method assert_valid_keys in Rails

If you are getting an error about ‘undefined method assert_valid_keys’ in Rails : undefined method `assert_valid_keys' for :time_entry_product:Symbol … it may be because you have two relationships specified on the same line in your model : ...

February 24, 2009 · 1 min · Dave Perrett

Nginx adds strange characters using rails/memcached_pass

After upgrading a few gems recently, I found that the content returned from the nginx memcached_pass directive always had a few strange characters prepended. After some investigation it seems that this is caused by rails ‘marshalling’ the data. If you’re using a memcached set command such as Cache.set(key, content, time_to_live) You need to add an extra argument to force rails to cache the raw data instead of marshalling it : ...

December 23, 2008 · 1 min · Dave Perrett

Phusion Passenger PassengerMaxPoolSize is ignored

I’ve been wondering for a while why Phusion Passenger seems to completely ignore the PassengerMaxPoolSize, PassengerMaxInstancesPerApp and PassengerPoolIdleTime directives. I recently discovered that they don’t work inside VirtualHost blocks in apache config. The old (non-working) config was something like : ...

December 22, 2008 · 1 min · Dave Perrett

memcaches_page plugin for Rails

This plugin is very similar to the built-in Rails ‘caches_page’ functionality, except it caches to memcached rather than a file. It relies on the ‘memcached_pass’ nginx directive to serve pages directly from memory if possible, and only passes to rails if necessary. On my server I’ve seen a 75% reduction in Ruby memory usage using this technique. ...

December 3, 2008 · 3 min · Dave Perrett

Rails NameError

If you’re getting NameError (uninitialized constant UnknownAction) using UnknownAction in the ‘rescue_action_in_public’ method, try to use the full reference (::ActionController::UnknownAction) instead of ActionController::UnknownAction. For example : ...

August 20, 2006 · 1 min · Dave Perrett