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class Page < ActiveRecord::Base

def assigned_widgets=(string)
...

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with_options :if => :password_validations_required? do |p|
  p.validates_presence_of     :password
  p.validates_presence_of     :password_confirmation
...

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in models/user.rb
...  

...

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def self.valid?(key)
  (h = find_by_key(key)) && (h.invitation_details_count < h.total)
end