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