Redmine

/lib/plugins/acts_as_versioned/lib/acts_as_versioned.rb

          # Finds versions of a specific model.  Takes an options hash like <tt>find</tt>
          def find_versions(id, options = {})
            versioned_class.all({
              :conditions => ["#{versioned_foreign_key} = ?", id],
              :order      => 'version' }.merge(options))
          end