category.rb

class Category < ActiveRecord::Base

  belongs_to :root, class_name:  "Category", :foreign_key => "category_id"
  has_many   :subcategories, class_name: "Category", foreign_key: "category_id"
  has_many   :auditions









  private


  def self.roots
    find(0)
  end

  def self.subs(params)
    subs = where(category_id: params)

  end






end