[Rails] How to change the value of User attribute

Dear All
i follow the instruction of Ruby on rails 3 tutorial, now i want to
update the email of the User,
user =User.find(1)
user.update_attributes(:email=>"test@gmail.com")

but the save failed, error message is "password can not be blank",
so i try this one
user.update_attributes(:email=>"test@gmail.com", :password =>"12345678")
then it success,but i dont want to update the password, i try a lots
times that is i want to change the value of other attributes, i must
update the password, if not ,the updating will fail.

how can i update without updating the password ?

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