Forg/app/models/user.rb

class User < ApplicationRecord
  has_secure_password
  generates_token_for :password_reset, expires_in: 4.hours do
    password_salt.last(10) # Invalidates when password changed
  end

  validates :username,
            presence: true,
            uniqueness: true,
            length: { minimum: 3, maximum: 20 }
  normalizes :username, with: ->(username) { username.strip.downcase }
  validates :email,
            presence: true,
            uniqueness: true,
            length: { minimum: 5, maximum: 100 },
            format: { with: URI::MailTo::EMAIL_REGEXP,
                      message: "must be a valid email address",
            }
  normalizes :email, with: ->(email) { email.strip.downcase }
  validates :first_name,
            presence: true,
            length: { maximum: 50 }
  validates :last_name,
            allow_nil: false,
            length: { maximum: 50 }

  def full_name
    return first_name if last_name.blank?

    "#{first_name} #{last_name}"
  end
end