Agile Web Development with Rails, Edition 4

14.3 Iteration I3: Limiting Access 14.1 Iteration I1: Adding Users

14.2 Iteration I2: Authenticating Users

Generate empty controllers for sessions and administration

rails generate controller Sessions new create destroy
      create  app/controllers/sessions_controller.rb
       route  get "sessions/destroy"
       route  get "sessions/create"
       route  get "sessions/new"
      invoke  erb
      create    app/views/sessions
      create    app/views/sessions/new.html.erb
      create    app/views/sessions/create.html.erb
      create    app/views/sessions/destroy.html.erb
      invoke  test_unit
      create    test/controllers/sessions_controller_test.rb
      invoke  helper
      create    app/helpers/sessions_helper.rb
      invoke    test_unit
      create      test/helpers/sessions_helper_test.rb
      invoke  assets
      invoke    coffee
      create      app/assets/javascripts/sessions.js.coffee
      invoke    scss
      create      app/assets/stylesheets/sessions.css.scss
rails generate controller Admin index
      create  app/controllers/admin_controller.rb
       route  get "admin/index"
      invoke  erb
      create    app/views/admin
      create    app/views/admin/index.html.erb
      invoke  test_unit
      create    test/controllers/admin_controller_test.rb
      invoke  helper
      create    app/helpers/admin_helper.rb
      invoke    test_unit
      create      test/helpers/admin_helper_test.rb
      invoke  assets
      invoke    coffee
      create      app/assets/javascripts/admin.js.coffee
      invoke    scss
      create      app/assets/stylesheets/admin.css.scss

Implement login in and out by storing the user_id in the session

edit app/controllers/sessions_controller.rb
class SessionsController < ApplicationController
  def new
  end
 
  def create
    user = User.find_by(name: params[:name])
    if user and user.authenticate(params[:password])
      session[:user_id] = user.id
      redirect_to admin_url
    else
      redirect_to login_url, alert: "Invalid user/password combination"
    end
  end
 
  def destroy
    session[:user_id] = nil
    redirect_to store_url, notice: "Logged out"
  end
end

Create the view using form_for as there is no underlying model

edit app/views/sessions/new.html.erb
<div class="depot_form">
  <% if flash[:alert] %>
    <p id="notice"><%= flash[:alert] %></p>
  <% end %>
 
  <%= form_tag do %>
    <fieldset>
      <legend>Please Log In</legend>
 
      <div>
        <%= label_tag :name, 'Name:' %>
        <%= text_field_tag :name, params[:name] %>
      </div>
 
      <div>
        <%= label_tag :password, 'Password:' %>
        <%= password_field_tag :password, params[:password] %>
      </div>
  
      <div>
        <%= submit_tag "Login" %>
      </div>
    </fieldset>
  <% end %>
</div>

Create a landing page for the administrator

edit app/views/admin/index.html.erb
<h1>Welcome</h1>
 
It's <%= Time.now %>
We have <%= pluralize(@total_orders, "order") %>.

Make the orders count available to the admin page

edit app/controllers/admin_controller.rb
class AdminController < ApplicationController
  def index
    @total_orders = Order.count
  end
end

Connect the routes to the controller actions

edit config/routes.rb

Do a login

get /login
Please Log In 
post /login
You are being redirected. 
get http://localhost:3000/admin

Welcome

It's 2016-03-05 12:42:55 -0500 We have 2 orders.

Fix the sessions controller test

edit test/controllers/sessions_controller_test.rb
require 'test_helper'
 
class SessionsControllerTest < ActionController::TestCase
  test "should get new" do
    get :new
    assert_response :success
  end
 
  test "should login" do
    dave = users(:one)
    post :create, name: dave.name, password: 'secret'
    assert_redirected_to admin_url
    assert_equal dave.id, session[:user_id]
  end
 
  test "should fail login" do
    dave = users(:one)
    post :create, name: dave.name, password: 'wrong'
    assert_redirected_to login_url
  end
 
  test "should logout" do
    delete :destroy
    assert_redirected_to store_url
  end
 
end
rake test
Run options: --seed 5750
 
# Running tests:
 
.........................................................
 
Finished tests in 2.074638s, 27.4747 tests/s, 82.9060 assertions/s.
 
57 tests, 172 assertions, 0 failures, 0 errors, 0 skips

14.3 Iteration I3: Limiting Access 14.1 Iteration I1: Adding Users