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I am using the Image Science library to do some simple thumbnailing of uploaded images in a project.

This library is very simple to use, and by all accounts is nice and lightweight and so seemed right.

However, I hit a few problems getting it installed.

One of the requirements on the site is for Ruby Inline. Now, in my haste the first time through I thought I could just gem install inline .

Hah, not so! The inline gem is not the RubyInline gem as linked to from the Image Science site.

So, one has to install the RubyInline gem to get it to work.

Of course this is clearly signposted on the Image Science  page, but I thought I’d note it here.

Assumption being the mother of all wasted evenings etc etc.

A neat way to sort a hash

my_hash.keys.sort_by {|s| s.to_s}.map {|key| [key, my_hash[key]] }

found here