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- #---
- # Excerpted from "Agile Web Development with Rails",
- # published by The Pragmatic Bookshelf.
- # Copyrights apply to this code. It may not be used to create training material,
- # courses, books, articles, and the like. Contact us if you are in doubt.
- # We make no guarantees that this code is fit for any purpose.
- # Visit http://www.pragmaticprogrammer.com/titles/rails4 for more book information.
- #---
- class User < ActiveRecord::Base
- validates :name, presence: true, uniqueness: true
- has_secure_password
- after_destroy :ensure_an_admin_remains
- private
- def ensure_an_admin_remains
- if User.count.zero?
- raise "Can't delete last user"
- end
- end
- end
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