Add average karma to user profiles

app/models/user.rb

@@ -56,6 +56,14 @@ class User < ActiveRecord::Base
     Keystore.value_for("user:#{self.id}:karma").to_i
   end
 
+  def average_karma
+    if self.karma == 0
+      0
+    else
+      self.karma.to_f / (self.stories_submitted_count + self.comments_posted_count)
+    end
+  end
+
   def stories_submitted_count
     Keystore.value_for("user:#{self.id}:stories_submitted").to_i
   end

app/views/users/show.html.erb

@@ -25,6 +25,12 @@
   </span>
   <br>
 
+  <label class="required">Average Karma:</label>
+  <span class="d">
+    <%= number_with_precision(@showing_user.average_karma, :precision => 2) %>
+  </span>
+  <br>
+
   <label class="required">Stories Submitted:</label>
   <span class="d">
     <a href="/newest/<%= @showing_user.username %>"><%=