feat(sample): add session and header

app/assets/javascripts/application.js

@@ -3,5 +3,6 @@
 
 // Configure your import map in config/importmap.rb. Read more: https://github.com/rails/importmap-rails
 import "@hotwired/turbo-rails"
-import "sample_app/app/assets/javascripts/controllers"
+// import "sample_app/app/assets/javascripts/controllers"
+//= require "controllers"
 //= require bootstrap-sprockets

app/controllers/sessions_controller.rb

@@ -0,0 +1,20 @@
+class SessionsController < ApplicationController
+  include SessionsHelper
+  def new
+  end
+
+  def create
+    user = User.find_by(email: params[:session][:email].downcase)
+    if user && user.authenticate(params[:session][:password])
+      reset_session
+      log_in user
+      redirect_to user
+    else
+      flash.now[:danger] = 'Invalid email/password combination'
+      render 'new'
+    end
+  end
+
+  def destroy
+  end
+end

app/helpers/sessions_helper.rb

@@ -0,0 +1,15 @@
+module SessionsHelper
+  def log_in(user)
+    session[:user_id] = user.id
+  end
+
+  def current_user
+    if session[:user_id]
+      @current_user ||= User.find_by(id: session[:user_id])
+    end
+  end
+
+  def logged_in?
+    !current_user.nil?
+  end
+end

app/views/layouts/_header.html.erb

@@ -5,7 +5,24 @@
       <ul class="nav navbar-nav navbar-right">
         <li><%= link_to "Home", root_url %></li>
         <li><%= link_to "Help", help_url %></li>
-        <li><%= link_to "Login in", '#' %></li>
+        <% if logged_in? %>
+          <li><%= link_to "Users", '#' %></li>
+          <li class="dropdown">
+            <a href="#" class="dropdown-toggle" data-toggle="dropdown">
+              Account <b class="caret"></b>
+            </a>
+            <ul class="dropdown-menu">
+              <li><%= link_to "Profile", current_user %></li>
+              <li><%= link_to "Settings", '#' %></li>
+              <li class="divider"></li>
+              <li>
+                <%= link_to "Log out", logout_path, method: :delete %>
+              </li>
+            </ul>
+          </li>
+        <% else %>
+          <li><%= link_to "Login in", login_url %></li>
+        <% end %>
       </ul>
     </nav>
   </div>

app/views/sessions/new.html.erb

@@ -0,0 +1,18 @@
+<% provide(:title, "Log in") %>
+
+<h1>Log in</h1>
+<div class ="row">
+  <div class="col-md-6 col-md-offset-3">
+    <%= form_with(url: login_path, scope: :session, local: true) do |f| %>
+      <%= f.label :email %>
+      <%= f.email_field :email, class: 'form-control' %>
+
+      <%= f.label :password %>
+      <%= f.password_field :password, class: 'form-control' %>
+
+      <%= f.submit "Log in", class: "btn btn-primary" %>
+    <% end %>
+
+    <p>New user? <%= link_to "SIgn up now!", signup_path %></p>
+  </div>
+</div>

config/routes.rb

@@ -1,4 +1,5 @@
 Rails.application.routes.draw do
+  # get "sessions/new"
   # get "users/new"
   # get "static_pages/home"
   # get "static_pages/help"
@@ -7,13 +8,17 @@ Rails.application.routes.draw do
 
   root "static_pages#home"
 
-  get '/help', to: 'static_pages#help'
-  get '/about', to: 'static_pages#about'
-  get '/contact', to: 'static_pages#contact'
-  get '/signup', to: 'users#new'
+  get '/help',        to: 'static_pages#help'
+  get '/about',       to: 'static_pages#about'
+  get '/contact',     to: 'static_pages#contact'
+  get '/signup',      to: 'users#new'
+
+  get '/login',       to: 'sessions#new'
+  post 'login',       to: 'sessions#create'
+  delete '/logout',   to: 'sessions#destroy'
 
   resources :users
-  
+
   # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 
   # Reveal health status on /up that returns 200 if the app boots with no exceptions, otherwise 500.

test/controllers/sessions_controller_test.rb

@@ -0,0 +1,8 @@
+require "test_helper"
+
+class SessionsControllerTest < ActionDispatch::IntegrationTest
+  test "should get new" do
+    get login_path
+    assert_response :success
+  end
+end

test/integration/users_login_test.rb

@@ -0,0 +1,14 @@
+require "test_helper"
+
+class UsersLoginTest < ActionDispatch::IntegrationTest
+  test "login with invalid information" do
+    get login_path
+    assert_template 'sessions/new'
+    post login_path, params: { session: {
+      email: "", password: "" } }
+    assert_template 'sessions/new'
+    assert_not flash.empty?
+    get root_path
+    assert flash.empty?
+  end
+end