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Adding Rails model attribute results in RecordNotSaved errors
class User < ActiveRecord::Base
  attr_accessor :password
  attr_accessible :name, :email, :password, :password_confirmation

  email_regex = /A[w+-.]+@[a-zd-.]+.[a-z]+z/i

  validates :name,  :presence => true,
                    :length   => { :maximum => 50 }

  validates :email, :presence   => true,
                    :format     => { :with => email_regex },
                    :uniqueness => { :case_sensitive => false }

  validates :password,  :presence     => true,
                        :confirmation => true,
                        :length       => { :within => 6..40 }

  before_save :encrypt_password
  before_save :confirmed_false

  def has_password?(submitted_password)
    encrypted_password == encrypt(submitted_password)
  end

  def self.authenticate(email, submitted_password)
    user = find_by_email(email)
    return nil if user.nil?
    return user if user.has_password?(submitted_password)
  end

  private

    def confirmed_false
      self.confirmed = false if new_record?
    end

    def encrypt_password
      self.salt = make_salt if new_record?
      self.encrypted_password = encrypt(password)
    end

    def encrypt(string)
      secure_hash("#{salt}--#{string}")
    end

    def make_salt
      secure_hash("#{Time.now.utc}--#{password}")
    end

    def secure_hash(string)
      Digest::SHA2.hexdigest(string)
    end
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class User < ActiveRecord::Base
  # unlike before_save it's only run once (on creation)
  before_create :set_registration_date

  def set_registration_date
    registration_date = Time.now # or Date.today
  end
end