The function that extracts allocated products variants with quantities

allocation.rb

  def variants_quantities
    line_items.each_with_object({}) do |line_item, variants|
      if line_item.sellable.variant?
        variants[line_item.sellable] ||= 0
        variants[line_item.sellable] += line_item.quantity
      elsif line_item.sellable.kit?
        line_item.sellable.contents.each do |content|
          variants[content.variant] ||= 0
          variants[content.variant] += content.quantity * line_item.quantity
        end
      end
    end
  end