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class Category < ActiveRecord::Base	has_one		:parent_category	has_many	:products		validates_presence_of :category_name, :parent_category_id	validates_uniqueness_of :category_name	validates_format_of :image_url,						:with => %r{\.(gif|jpg|jpeg|png)$}i,						:message => "must be a URL for GIF, JPG, JPEG or PNG image"		def self.find_by_parent_category_name(parent_category_name)		parent_category_id = ParentCategory.find_by_parent_category_name(parent_category_name).id		find(:all, :conditions => ["parent_category_id = ?", parent_category_id])	end		def self.find_by_parent_category_id(parent_category_id)		find(:all, :conditions => ["parent_category_id = ?", parent_category_id])	endend