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Very simple Rails plugin that adds the method 'previous_changes' to ActiveRecord objects that can be called after saving a model object to fetch what the method 'changes' would have returned just before the save occurred (a hash from attribute name to a pair of values - the old attribute value and the new attribute value). Installation ------------ $ gem sources -a http://gems.github.com (you only have to do this once) $ sudo gem install tomriley-previous_changes Then add a dependency to your rails environment.rb: config.gem 'tomriley-previous_changes', :lib => 'previous_changes', :version => '0.0.1'