name /u/:username route

app/controllers/users_controller.rb

@@ -1,6 +1,6 @@
 class UsersController < ApplicationController
   def show
-    @showing_user = User.where(:username => params[:id]).first!
+    @showing_user = User.where(:username => params[:username]).first!
     @title = "User #{@showing_user.username}"
   end
 

app/models/user.rb

@@ -123,6 +123,10 @@ class User < ActiveRecord::Base
     Keystore.value_for("user:#{self.id}:stories_submitted").to_i
   end
 
+  def to_param
+    username
+  end
+
   def undeleted_received_messages
     received_messages.where(:deleted_by_recipient => false)
   end

config/routes.rb

@@ -68,7 +68,7 @@ Lobsters::Application.routes.draw do
   get "/s/:id/(:title)" => "stories#show"
 
   get "/u" => "users#tree"
-  get "/u/:id" => "users#show", :as => "user"
+  get "/u/:username" => "users#show", :as => "user"
 
   get "/settings" => "settings#index"
   post "/settings" => "settings#update"