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orbit-4-1/app/models/layout.rb

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class Layout
include Mongoid::Document
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field :name, :index => true
field :description
field :content
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references_many :children, :class_name => "Item"
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validates_presence_of :name
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validates_format_of :name, :with => /^[0-9a-zA-Z\-_]+$/
validates_uniqueness_of :name
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def self.exist_one?
Layout.count > 0
end
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end