session creation

app/controllers/application_controller.rb

@@ -1,2 +1,10 @@
 class ApplicationController < ActionController::Base
+  helper_method :current_user
+  helper_method :logged_in?
+  def current_user
+    User.find_by(id: session[:user_id])
+  end
+  def logged_in?
+    !current_user.nil?
+  end
 end

app/controllers/sessions_controller.rb

@@ -3,6 +3,11 @@ class SessionsController < ApplicationController
   end
 
   def create
+    @user = User.find_by(username: params[:username])
+    if @user && @user.authenticate(params[:password])
+      sessions[:user_id] = @user.id
+    end
+    redirect_to '/welcome'
   end
 
   def welcome

app/controllers/users_controller.rb

@@ -1,5 +1,6 @@
 class UsersController < ApplicationController
   def new
+    @user = User.new
   end
 
   def create

app/views/sessions/new.html.erb

@@ -1,2 +1,8 @@
-<h1>Sessions#new</h1>
-<p>Find me in app/views/sessions/new.html.erb</p>
+<h1>Login</h1>
+  <%= form_tag '/login' do %>
+  <%= label_tag :username%>
+  <%= text_field_tag :username %>
+  <%= label_tag :password%>
+  <%= password_field_tag :password%>
+  <%= submit_tag "Login"%>
+<%end%>

app/views/sessions/welcome.html.erb

@@ -1,3 +1,6 @@
 <h1>Welcome</h1>
+<% if logged_in? %>
+  <h1>You are Logged In, <%= current_user.username %></h1>
+<%end%>
 <%= button_to "Login", '/login', method: :get%>
 <%= button_to "Sign Up", '/users/new', method: :get%>