gistfile1.rb

# Orig

  def items options = Hash.new
    products = true_category.descendant_products.available.visible

    if options[:vendor]
      products = products.by_vendor options[:vendor]
    end

    if options[:factor]
      products = products.factored_by options[:factor]
    end

    if options[:filters] && options[:filters].any?
      products = products.find_from_tags_and_vendors options[:filters]
    end

    if options[:ids]
      products = products.select(:id)
    end

    products
  end


# New

  def items(options={})
    {
      :vendor => :by_vendor,
      :factor => :factored_by,
      :filters => :find_from_tags_and_vendors,
      :ids => [ :select, :id ]
    }.inject true_category.descendant_products.available.visible do |rel, opt, meth, arg|
      !(val = options[opt]).blank? ? rel.send *[ meth, arg || val ] : rel
    end
  end