class User < ActiveRecord::Base
	attr_accessible :name
	validates :name, :presence => true, :uniqueness => true

	validates :password, :confirmation => true
	attr_accessor :password_confirmation
	attr_reader :password

	validate :password_must_be_present

	def User.encrypt_password(password, salt)
		Digest::SHA2.hexidigest(password + "wibble" + salt)
	end

	def User.authenticate(name, password)
		if user = find_by_name(name)
			if user.hashed_password == encrypt_password(password, user.salt)
				user
			end
		end
	end

	def generate_salt
		self.salt = self.object_id.to_s + rand.to_s
	end

	def password=(password)
		@password = password

		if password.present?
			generate_salt
			self.hased_password = self.class.encrypt_password(password, salt)
		end
	end

	private
	def password_must_be_present
		errors.add(:password, "Missing password") unless hashed_password.present?
	end
end


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line with error:
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@user = User.new(params[:user])