has secure password memo

hspm.rb

# some notes on using has_secure_password 

class User < ActiveRecord::Base
  has_secure_password
   
  attr_accessible :login_name, :password, :password_confirmation

  # secure_password.rb already checks for presence of :password_digest
  # so we can assume that a password is present if that validation passes
  # and thus, we don't need to explicitly check for presence of password
  validates :password, 
    :length => { :minimum => 6 }, :if => :password_digest_changed?

  # secure_password.rb also checks for confirmation of :password 
  # but we also have to check for presence of :password_confirmation
  validates :password_confirmation, 
    :presence=>true, :if => :password_digest_changed?

___
# In `config/locales/en.yml` make sure that errors on
# the password_digest field refer to "Password" as it's more human friendly 

en:
  hello: "Hello world"
  
  activerecord:
    attributes:
      user:
        password_digest: "Password"  

still having Validation failed: Password confirmation can't be blank