Ruby on Rails - ActiveRecord Model

1class User < ApplicationRecord
2  has_secure_password
3  has_many :posts, dependent: :destroy
4  has_many :comments, through: :posts
5  belongs_to :organization, optional: true
6 
7  validates :email, presence: true,
8                    uniqueness: { case_sensitive: false },
9                    format: { with: URI::MailTo::EMAIL_REGEXP }
10  validates :username, presence: true, length: { in: 3..30 }
11 
12  scope :active, -> { where(active: true) }
13  scope :created_after, ->(date) { where('created_at > ?', date) }
14 
15  before_save :downcase_email
16  after_create :send_welcome_email
17 
18  def full_name
19    "#{first_name} #{last_name}".strip
20  end
21 
22  private
23 
24  def downcase_email
25    self.email = email.downcase
26  end
27 
28  def send_welcome_email
29    UserMailer.welcome(self).deliver_later
30  end
31end