orbit-basic/app/models/item.rb

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class Item
include MongoMapper::Document
key :_type, String
key :name, String, :required => true, :index => true
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key :parent_name, String, :index => true
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key :parent_id, ObjectId, :index => true
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key_i18n :title, String, :required => true
key :position, Integer, :required => true
key :is_published, Boolean, :required => true, :default => true, :index => true
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validates_format_of :name, :with => /^[a-zA-Z-_]+$/
validates_uniqueness_of :name
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belongs_to :parent, :class_name => "Item", :foreign_key => :parent_id
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many :children, :class_name => "Item", :foreign_key => :parent_id, :dependent => :destroy
before_validation :setup_default_value
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def self.find_by_name(item_name)
Item.find(:first, :conditions => { :name => item_name, :is_published => true })
end
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def ancestors
node, nodes = self, []
nodes << node = node.parent while !node.parent.blank?
nodes.reverse
end
protected
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def setup_default_value
if self.position.blank?
max_page = Page.find(:last, :order => 'position')
self.position = (max_page)? max_page.position.to_i + 1 : 1
end
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if self.parent_name.blank?
self.parent_name = nil
self.parent_id = nil
else
self.parent_id = Item.find_by_name( self.parent_name ).id
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end
end
end