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>
+<h1>Login</h1>
-<p>Find me in app/views/sessions/new.html.erb</p>
+  <%= 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%>

spec/controllers/application_controller_spec.rb

@@ -0,0 +1,18 @@
+require 'rails_helper'
+
+RSpec.describe ApplicationController do
+  describe 'current_user' do
+    before(:all) do
+      User.create(username: 'karol.selak@gmail.com', password: 'abcde')
+    end
+    context 'when a user is logged in' do
+      it 'returns the user' do
+        # TODO
+        # expect(current_user.username).to eql('karol.selak@gmail.com')
+      end
+    end
+  end
+  describe 'logged_in?' do
+    # TODO
+  end
+end

spec/controllers/sessions_controller_spec.rb

@@ -8,6 +8,11 @@ RSpec.describe SessionsController do
     end
   end
   describe 'get create' do
+    # TODO test session status
+    subject { get 'create' }
+    it 'redirects to /welcome' do
+      expect(subject).to redirect_to('/welcome')
+    end
   end
   describe 'get welcome' do
     subject { get 'welcome' }

spec/controllers/users_controller_spec.rb

@@ -8,5 +8,19 @@ RSpec.describe UsersController do
     end
   end
   describe 'get create' do
+    before(:all) do # TODO change it to cleanup after each test
+      User.destroy_all
+    end
+    subject {
+      get :create, params: {user: {username: 'karol.selak@gmail.com', password: 'abcde'}}
+    }
+    it 'creates a user' do
+      subject
+      expect(User.where(username: 'karol.selak@gmail.com').size).to eql(1)
+    end
+    it 'redirects to /welcome' do
+      subject
+      expect(subject).to redirect_to('/welcome')
+    end
   end
 end

spec/spec_helper.rb

@@ -93,4 +93,4 @@ RSpec.configure do |config|
   # as the one that triggered the failure.
   Kernel.srand config.seed
 =end
-end
+end