lib/version.rb in versioned-0.1.0 vs lib/version.rb in versioned-0.2.0

@@ -15,6 +15,22 @@
   alias_attribute :version, :number
 
   def <=>(other)
     number <=> other.number
   end
+
+  def previous
+    find_related(:first, :number => {:$lt => number}, :order => 'number.desc')
+  end
+
+  def next
+    find_related(:first, :number => {:$gt => number}, :order => 'number.asc')
+  end
+
+  protected
+
+  def find_related(*args)
+    options = args.extract_options!
+    params = options.merge(:versioned_id => versioned_id, :versioned_type => versioned_type)
+    self.class.find(args.first, params)
+  end
 end