Orbit/app/models/snippet.rb

class Snippet
  
  include Mongoid::Document
  include Mongoid::Timestamps
  
  field :name, :index => true
  field :full_name, :index => true
  
  field :parent_id, :index => true
  field :parent_name
  
  field :content
  
  before_validation :setup_default_value
  validates_presence_of :name, :full_name, :parent_id
  validates_uniqueness_of :name, :scope => :parent_id
  
  referenced_in :parent, :class_name => "Item", :foreign_key => :parent_id

  # Get an array of ancestors
  def ancestors
    node, nodes = self, []
    nodes << node = node.parent while !node.parent.blank? rescue nil
    nodes.reverse
  end
  
  def setup_default_value
    # Set the parent value
    self.parent_name = Item.find( self.parent_id ).name rescue nil
    
    # Build the full_name from the ancestors array
    full_node = self.ancestors.map{ |a| a.name }.push( self.name )
    # Remove root node if not root
    full_node.shift if full_node.size >= 2
    self.full_name = full_node.join("/")
  end   
  
end