working login, signup, and logout

app/controllers/application_controller.rb

@@ -9,7 +9,7 @@ class ApplicationController < ActionController::Base
   private
 
   def current_user
-    @current_user ||= User.find_by_user_id(session[:user_id].to_s)
+    @current_user ||= User.find_by_id(session[:id].to_s)
   end
   
   def authenticated

app/controllers/dashboard_controller.rb

@@ -0,0 +1,6 @@
+class DashboardController < ApplicationController
+
+  def home
+  end
+
+end

app/controllers/sessions_controller.rb

@@ -3,9 +3,22 @@ class SessionsController < ApplicationController
   skip_before_filter :authenticated, :only => [:new, :create]
   
   def new
+    redirect_to dashboard_home_path(:dashboard_id => current_user.id) if current_user && current_user.id
   end
   
   def create
+      user = User.authenticate(params[:email], params[:password])
+      if user
+        session[:id] = user.id if User.where(:id => user.id).exists?
+        redirect_to dashboard_home_path(:dashboard_id => user.id)
+      else
+        render "new"
+      end
+  end
+  
+  def destroy
+    reset_session
+    redirect_to root_path
   end
 
 end

app/controllers/users_controller.rb

@@ -3,9 +3,18 @@ class UsersController < ApplicationController
   skip_before_filter :authenticated, :only => [:new, :create]
   
   def new
+    @user = User.new
   end
   
   def create
+    user = User.new(params[:user])
+    if user.save
+      session[:id] = user.id
+      redirect_to dashboard_home_path(:dashboard_id => user.id)
+    else
+      @user = User.new
+      render :new
+    end
   end
   
 end