upto 3.5

app/controllers/application_controller.rb

@@ -1,2 +1,7 @@
 class ApplicationController < ActionController::Base
+  helper_method :current_user
+  def current_user
+    return nil if session[:user_id].nil?
+    User.find session[:user_id]
+  end
 end

app/controllers/ratings_controller.rb

@@ -9,7 +9,7 @@ class RatingsController < ApplicationController
   end
 
   def create
-    Rating.create params.require(:rating).permit(:score, :beer_id)
+    rating = Rating.create params.require(:rating).permit(:score, :beer_id)
     session[:last_rating] = "#{rating.beer.name} #{rating.score} points"
 
     redirect_to ratings_path

app/controllers/sessions_controller.rb

@@ -10,6 +10,6 @@ class SessionsController < ApplicationController
 
   def destroy
     session[:user_id] = nil
-    redirect_to :root
+    redirect_to "/"
   end
 end

app/controllers/users_controller.rb

@@ -8,6 +8,7 @@ class UsersController < ApplicationController
 
   # GET /users/1 or /users/1.json
   def show
+    @user = User.find current_user.id
   end
 
   # GET /users/new