Ch 6 Completed

Today, I have completed the Chapter 6 Modeling User of Michael Hartl's book.

* I created a new brach 'modeling-users'.

$ git checkout -b modeling-users

* I created a new model (database table) 'user' (singular).

$ rails generate model User name:string email:string

** Note plural convention for controller names, singular for model names.
a Users controller, but a User model
The table name is plural (users) even though the model name is singular (User)

* I ran the database migration command.

$ rails db:migrate

* I wrote some test cases for testing the User model.
test/models/user_test.rb

require 'test_helper'

class UserTest < ActiveSupport::TestCase

  def setup
    @user = User.new(name: "Example User", email: "user@example.com",
    password: "foobar", password_confirmation: "foobar")
  end

  test "should be valid" do
    assert @user.valid?
  end   

  test "name should be present" do
    @user.name = "     "
    assert_not @user.valid?
  end

  test "email should be present" do
    @user.email = "     "
    assert_not @user.valid?
  end

  test "name should not be too long" do
    @user.name = "a" * 51
    assert_not @user.valid?
  end

  test "email should not be too long" do
    @user.email = "a" * 244 + "@example.com"
    assert_not @user.valid?
  end   

  test "email validation should accept valid addresses" do
    valid_addresses = %w[user@example.com USER@foo.COM A_US-ER@foo.bar.org
                         first.last@foo.jp alice+bob@baz.cn]
    valid_addresses.each do |valid_address|
      @user.email = valid_address
      assert @user.valid?, "#{valid_address.inspect} should be valid"
    end
  end   

  test "email validation should reject invalid addresses" do
    invalid_addresses = %w[user@example,com user_at_foo.org user.name@example.
                           foo@bar_baz.com foo@bar+baz.com foo@bar_baz..com]
    invalid_addresses.each do |invalid_address|
      @user.email = invalid_address
      assert_not @user.valid?, "#{invalid_address.inspect} should be invalid"
    end
  end   

  test "email addresses should be unique" do
    duplicate_user = @user.dup
    duplicate_user.email = @user.email.upcase     
    @user.save
    assert_not duplicate_user.valid?
  end

  test "password should be present (nonblank)" do
    @user.password = @user.password_confirmation = " " * 6
    assert_not @user.valid?
  end

  test "password should have a minimum length" do
    @user.password = @user.password_confirmation = "a" * 5
    assert_not @user.valid?
  end
       
end

* The User model file
app/models/user.rb

class User < ApplicationRecord
  before_save { self.email = email.downcase }
  validates :name, presence: true, length: { maximum: 50 }
  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(\.[a-z\d\-]+)*\.[a-z]+\z/i   
  validates :email, presence: true, length: { maximum: 255 },
                    format: { with: VALID_EMAIL_REGEX },
                    uniqueness: { case_sensitive: false }
  has_secure_password
  validates :password, presence: true, length: { minimum: 6 }   
end

* I ran a model test.

$ rails test:models

* I added an index to table Users field Email.

$ rails generate migration add_index_to_users_email

* I filled the email unique requirement to the db migration file.
db/migrate/[timestamp]_add_index_to_users_email.rb

class AddIndexToUsersEmail < ActiveRecord::Migration[5.0]
  def change
    add_index :users, :email, unique: true
  end
end

* Don't forget to run the db migrate command.

$ rails db:migrate

* I deleted the database fixture temporarily.
test/fixtures/users.yml

# empty

* I added a password digest for model User.

$ rails generate migration add_password_digest_to_users password_digest:string

* Then I ran the db migrate command.

$ rails db:migrate

* I addded the bcrypt gem to my Gemfile.

gem 'bcrypt',         '3.1.11'

* Then I ran bundle install.

$ bundle install

* At the end of the chapter, I commited using Git and pushed it onto Github.

$ rails test
$ git add -A
$ git commit -m "Make a basic User model (including secure passwords)"

$ git checkout master
$ git merge modeling-users
$ git push