add a flat version of the user tree, ordered by karma

app/controllers/users_controller.rb

@@ -7,10 +7,15 @@ class UsersController < ApplicationController
   def tree
     @title = "Users"
 
-    users = User.order("id DESC").to_a
-
-    @user_count = users.length
-    @users_by_parent = users.group_by(&:invited_by_user_id)
+    if params[:by].to_s == "karma"
+      @users = User.order("karma DESC, id ASC").to_a
+      @user_count = @users.length
+      render :action => "list"
+    else
+      users = User.order("id DESC").to_a
+      @user_count = users.length
+      @users_by_parent = users.group_by(&:invited_by_user_id)
+    end
   end
 
   def invite

app/views/users/list.html.erb

@@ -0,0 +1,22 @@
+<div class="box wide">
+  <p><strong>Users (<%= @user_count %>)</strong></p>
+
+  <ul class="user_tree">
+  <% @users.each do |user| %>
+    <li>
+      <a href="/u/<%= user.username %>"
+        <% if !user.is_active? %>
+          class="inactive_user"
+        <% elsif user.is_new? %>
+          class="new_user"
+        <% end %>
+        ><%= user.username %></a>&nbsp;(<%= user.karma %>)
+      <% if user.is_admin? %>
+        (administrator)
+      <% elsif user.is_moderator? %>
+        (moderator)
+      <% end %>
+    </li>
+  <% end %>
+  </ul>
+</div>