item.rb error

item.rb

class Item < ActiveRecord::Base
        attr_accessible :name, :price, :priority,:picture,:url
        belongs_to :user
        validates :name, presence: true
        validates :price, presence: true
        validates :price, length: { :maximum => 7}
        has_attached_file :picture,:styles => {:small => "100x100>"}
        validates_attachment_size :picture, :less_than => 5.megabytes
        validates :url, format: /(^$)|(^(http|https):\/\/[a-z0-9]+([\-\.]{1}[a-z0-9]+)*\.[a-z]{2,5}(([0-9]{1,5})?\/.*)?$)/ix
        validates_attachment_content_type :picture, :content_type => ['image/jpeg', 'image/png']
        validates :price,:numericality => true, :allow_nil => true

        #default_scope {where "completed<>trued"}
        

	def source
		
		
			hostname=@url.split('/')[2]//This doesn't work: nilClass for url
                        
			hostname=self.url.split('/')[2]//This does
 		        hostname["www."]=""
			hostname.capitalize	
		

	end

end