User model (sample_app)

user.rb

# == Schema Information
#
# Table name: users
#
#  id         :integer         not null, primary key
#  name       :string(255)
#  email      :string(255)
#  created_at :datetime
#  updated_at :datetime
#

class User < ActiveRecord::Base
  attr_accessor :password
  attr_accessible :name, :email, :password, :password_confirmation

  email_regex = /\A[\w+\-.]+@[a-z\d\-.]+\.[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

  private
    def encrypt_password
      self.encrypted_password = encrypt(password)
    end

    def encrypt(string)
      string
    end
end