Make a basic User model (including secure password)

Gemfile

@@ -57,6 +57,7 @@
 source 'https://rubygems.org'
 
 gem 'rails',        '5.1.4'
+gem 'bcrypt',         '3.1.12'
 gem 'bootstrap-sass', '3.3.7'
 gem 'puma',         '3.9.1'
 gem 'sass-rails',   '5.0.6'

Gemfile.lock

@@ -42,6 +42,7 @@ GEM
     arel (8.0.0)
     autoprefixer-rails (8.5.1)
       execjs
+    bcrypt (3.1.12)
     bindex (0.5.0)
     bootstrap-sass (3.3.7)
       autoprefixer-rails (>= 5.2.1)
@@ -202,6 +203,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  bcrypt (= 3.1.12)
   bootstrap-sass (= 3.3.7)
   byebug (= 9.0.6)
   coffee-rails (= 4.2.2)

app/models/user.rb

+class User < ApplicationRecord
+  before_save  { self.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 }
+  validates :password, presence: true, length: {minimum: 6}         
+  has_secure_password
+end

db/migrate/20180529022731_create_users.rb

+class CreateUsers < ActiveRecord::Migration[5.1]
+  def change
+    create_table :users do |t|
+      t.string :name
+      t.string :email
+
+      t.timestamps
+    end
+  end
+end

db/migrate/20180529065643_add_index_to_users_email.rb

+class AddIndexToUsersEmail < ActiveRecord::Migration[5.1]
+  def change
+    add_index :users, :email, unique: true
+  end
+end

db/migrate/20180529074848_add_password_digest_to_users.rb

+class AddPasswordDigestToUsers < ActiveRecord::Migration[5.1]
+  def change
+    add_column :users, :password_digest, :string
+  end
+end

db/schema.rb

+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended that you check this file into your version control system.
+
+ActiveRecord::Schema.define(version: 20180529074848) do
+
+  create_table "users", force: :cascade do |t|
+    t.string "name"
+    t.string "email"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.string "password_digest"
+    t.index ["email"], name: "index_users_on_email", unique: true
+  end
+
+end

test/fixtures/users.yml

+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/FixtureSet.html

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 address' 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 addresses should be unique' do
+    duplicate_user = @user.dup
+    @user.save
+    assert_not duplicate_user.valid?
+  end
+
+  test 'email address should be saved ass lower-case' do
+    mixed_case_email = 'Foo@exAMPle.com'
+    @user.email = mixed_case_email
+    @user.save
+    assert_equal mixed_case_email.downcase, @user.reload.email
+  end
+
+  test 'password should be present (nonblank)' do
+    @user.password = @user.password_confirmation = ' ' * 6
+    assert_not @user.valid?
+  end
+
+  test 'password should have minimum length' do
+    @user.password = @user.password_confirmation = 'a' * 5
+    assert_not @user.valid?
+  end
+end