A bit of golf

app/models/revision.rb

@@ -6,6 +6,7 @@ require 'author'
 require 'page'
 
 class Revision
+
   attr_accessor :page, :number, :content, :created_at, :author
 
   def initialize(page, number, content, created_at, author)
@@ -29,7 +30,7 @@ class Revision
   end
 
   def previous_revision
-    number - 1 >= 0 && page.revisions[number - 1]
+    number > 0 ? page.revisions[number - 1] : nil
   end
 
   # Returns an array of all the WikiWords present in the content of this revision.
@@ -78,4 +79,5 @@ class Revision
   def display_content_for_export
     WikiContent.new(self, {:mode => :export} )
   end
+
 end