logout

app/controllers/sessions_controller.rb

@@ -5,11 +5,16 @@ class SessionsController < ApplicationController
   def create
     @user = User.find_by(username: params[:username])
     if @user && @user.authenticate(params[:password])
-      sessions[:user_id] = @user.id
+      session[:user_id] = @user.id
     end
     redirect_to '/welcome'
   end
 
+  def delete
+    session.delete(:user_id)
+    redirect_to '/welcome'
+  end
+
   def welcome
   end
 end

app/views/sessions/welcome.html.erb

@@ -1,6 +1,8 @@
 <h1>Welcome</h1>
 <% if logged_in? %>
   <h1>You are Logged In, <%= current_user.username %></h1>
+  <%= button_to "Logout", '/logout', method: :get%>
+<%else%>
+  <%= button_to "Login", '/login', method: :get%>
+  <%= button_to "Sign Up", '/users/new', method: :get%>
 <%end%>
-<%= button_to "Login", '/login', method: :get%>
-<%= button_to "Sign Up", '/users/new', method: :get%>