app/views/crops/index.rss.haml
<?xml version="1.0" encoding="UTF-8"?>
%rss{ version: 2.0 }
%channel
%title Recently added crops (#{ENV['GROWSTUFF_SITE_NAME']})
%link= crops_url
- @crops.each do |crop|
%item
%title= crop.name
%pubdate= crop.created_at.to_fs(:rfc822)
%link= crop_url(crop)
%guid= crop_url(crop)