passwords - how to NOT update a field Ruby on Rails -


i'm newbie in rails. how put validated on password field. specified on create , used allow_blank method. everytime update still creates nil in password field. help?

validates :password, :presence => { :on => :create },                      :confirmation => true,                      :length => { :within => 8..40},                      :allow_blank => true,

try this:

validates :password, :presence => { :if => :new_record? },                      :confirmation => true,                      :length => { :within => 8..40 }

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