class Taxonomy < ActiveRecord::Base

  validates :name, :presence => true
  has_many :taxons, :dependent => :destroy
  has_one :root, :class_name => 'Taxon', :conditions => "parent_id is null"
  has_one :image, :as => :viewable, :order => :position, :dependent => :destroy
  after_save :set_name

  private

  def set_name
    if self.root
      self.root.update_attribute(:name, self.name)
    else
      self.root = Taxon.create!({ :taxonomy_id => self.id, :name => self.name })
  
    end
  end

end