Agile Web Development with Rails, Edition 4

14.1 Iteration I1: Adding Users

Scaffold the user model

rails generate scaffold User name:string password_digest:string

      invoke  active_record

      create    db/migrate/20121011071644_create_users.rb

      create    app/models/user.rb

      invoke    test_unit

      create      test/unit/user_test.rb

      create      test/fixtures/users.yml

      invoke  resource_route

       route    resources :users

      invoke  scaffold_controller

      create    app/controllers/users_controller.rb

      invoke    erb

      create      app/views/users

      create      app/views/users/index.html.erb

      create      app/views/users/edit.html.erb

      create      app/views/users/show.html.erb

      create      app/views/users/new.html.erb

      create      app/views/users/_form.html.erb

      invoke    test_unit

      create      test/functional/users_controller_test.rb

      invoke    helper

      create      app/helpers/users_helper.rb

      invoke      test_unit

      create        test/unit/helpers/users_helper_test.rb

      invoke  assets

      invoke    coffee

      create      app/assets/javascripts/users.js.coffee

      invoke    scss

      create      app/assets/stylesheets/users.css.scss

      invoke  scss

   identical    app/assets/stylesheets/scaffolds.css.scss

uncomment out bcrypt-ruby

edit Gemfile

# To use ActiveModel has_secure_password

gem 'bcrypt-ruby', '~> 3.0.0'

Run the migration

rake db:migrate

mv 20121011071644_create_users.rb 20110711000009_create_users.rb

==  CreateUsers: migrating ====================================================

-- create_table(:users)

   -> 0.0082s

==  CreateUsers: migrated (0.0083s) ===========================================

Add validation, has_secure_password

edit app/models/user.rb

class User < ActiveRecord::Base

  attr_accessible :name, :password, :password_confirmation

  validates :name, :presence => true, :uniqueness => true

  has_secure_password

end

Avoid redirect after create, update operations

edit app/controllers/users_controller.rb

  def create

    @user = User.new(params[:user])

    respond_to do |format|

      if @user.save

        format.html { redirect_to users_url,

          :notice => "User #{@user.name} was successfully created." }

        format.json { render :json => @user,

          :status => :created, :location => @user }

      else

        format.html { render :action => "new" }

        format.json { render :json => @user.errors,

          :status => :unprocessable_entity }

end

end

end

edit app/controllers/users_controller.rb

  def update

    @user = User.find(params[:id])

    respond_to do |format|

      if @user.update_attributes(params[:user])

        format.html { redirect_to users_url,

          :notice => "User #{@user.name} was successfully updated." }

        format.json { head :no_content }

      else

        format.html { render :action => "edit" }

        format.json { render :json => @user.errors,

          :status => :unprocessable_entity }

end

end

end

Display users sorted by name

edit app/controllers/users_controller.rb

  def index

    @users = User.order(:name)

    respond_to do |format|

      format.html # index.html.erb

      format.json { render :json => @users }

end

end

Add Notice, and remove password digest from view

edit app/views/users/index.html.erb

<h1>Listing users</h1>

  <% if notice %>

  <p id="notice"><%= notice %></p>

  <% end %>

<table>

  <tr>

    <th>Name</th>

    <th></th>

    <th></th>

    <th></th>

  </tr>

<% @users.each do |user| %>

  <tr>

    <td><%= user.name %></td>

    <td><%= link_to 'Show', user %></td>

    <td><%= link_to 'Edit', edit_user_path(user) %></td>

    <td><%= link_to 'Destroy', user, :method => :delete,

      :data => { :confirm => 'Are you sure?' } %></td>

  </tr>

<% end %>

</table>

<br />

<%= link_to 'New User', new_user_path %>

Update form used to both create and update users

edit app/views/users/_form.html.erb

<div class="depot_form">

<%= form_for @user do |f| %>

  <% if @user.errors.any? %>

    <div id="error_explanation">

      <h2><%= pluralize(@user.errors.count, "error") %>

        prohibited this user from being saved:</h2>

      <ul>

      <% @user.errors.full_messages.each do |msg| %>

        <li><%= msg %></li>

      <% end %>

      </ul>

    </div>

  <% end %>

  <fieldset>

  <legend>Enter User Details</legend>

  <div>

    <%= f.label :name %>:

    <%= f.text_field :name, :size => 40 %>

  </div>

  <div>

    <%= f.label :password, 'Password' %>:

    <%= f.password_field :password, :size => 40 %>

  </div>

  <div>

    <%= f.label :password_confirmation, 'Confirm' %>:

    <%= f.password_field :password_confirmation, :size => 40 %>

  </div>

  <div>

    <%= f.submit %>

  </div>

  </fieldset>

<% end %>

</div>

Demonstrate creating a new user

get /users

Listing users

Name

get /users/new

Back

post /users

You are being redirected.

get http://localhost:3000/users

User dave was successfully created.

Name
dave	Show	Edit	Destroy

Show how this is stored in the database

sqlite3> select * from users

             id = 1

           name = dave

password_digest = $2a$10$R1XVWxWXS8/3jy.kuOdNJujqzi2x9AtOSr77eslFJJmzklzE9Sqhu

     created_at = 2012-10-11 07:16:59.436442

     updated_at = 2012-10-11 07:16:59.436442

edit test/functional/users_controller_test.rb

require 'test_helper'

class UsersControllerTest < ActionController::TestCase

  setup do

    @input_attributes = {

      :name                  => "sam",

      :password              => "private",

      :password_confirmation => "private"

    @user = users(:one)

end

  #...

  test "should create user" do

    assert_difference('User.count') do

      post :create, :user => @input_attributes

end

    assert_redirected_to users_path

end

  #...

  test "should update user" do

    put :update, :id => @user, :user => @input_attributes

    assert_redirected_to users_path

end

end