#this class handles user login and password. User has the attributes user name, email and password which he / she can choose
class User
  include Mongoid::Document
  include Mongoid::Timestamps
  include ActiveModel::SecurePassword

  field :user_name, type: String
  field :email, type: String
  field :password_digest, type: String

  has_secure_password

  VALID_EMAIL_FORMAT = /\A[^@\s]+@([^@.\s]+\.)+[^@.\s]+\z/

  validates :user_name, presence: true, uniqueness: true
  validates :password, presence: true, :on => :create, length: {:in => 8..20}
  validates :email, presence: true, uniqueness: true, format: { with: VALID_EMAIL_FORMAT }
end