def price

gistfile1.rb

  def price
   number_to_currency(source.price, precision: 2) ||
   if variation
     then number_to_currency(variation.price, precision: 2)
     else number_to_currency(product.price, precision: 2)
   end
  end



module JobsHelper      
  def to_dollar(amount)
    if amount < 0
      number_to_currency(amount.abs, :precision => 0, :format => "-%u%n")
    else
      number_to_currency(amount, :precision => 0)
    end
  end      
end

Cool