validate :display_name_cannot_be_user_id_with_other_id, :if => proc { |u| u.display_name_changed? }
validates :email, :presence => true, :confirmation => true, :characters => true
validates :email, :if => proc { |u| u.email_changed? },
validate :display_name_cannot_be_user_id_with_other_id, :if => proc { |u| u.display_name_changed? }
validates :email, :presence => true, :confirmation => true, :characters => true
validates :email, :if => proc { |u| u.email_changed? },