users/app/models/local_email.rb


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class LocalEmail < Email

  validate :unique_on_server

  def to_partial_path
    "emails/email"
  end

  def unique_on_server
     has_email = User.find_by_email_or_alias(email)
     if has_email && has_email != self.base_doc
      errors.add(:email, "has already been taken")
    end
  end
end