Class: ActiveShipping::ShipmentPacker

Inherits:
Object
  • Object
show all
Defined in:
lib/active_shipping/shipment_packer.rb

Defined Under Namespace

Classes: ExcessPackageQuantity, OverweightItem

Constant Summary collapse

EXCESS_PACKAGE_QUANTITY_THRESHOLD = 
10_000

Class Method Summary collapse

Class Method Details

.pack(items, dimensions, maximum_weight, currency) ⇒ Object 



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# File 'lib/active_shipping/shipment_packer.rb', line 16

def pack(items, dimensions, maximum_weight, currency)
  return [] if items.empty?
  packages = []
  items.map!(&:symbolize_keys)

  # Naive in that it assumes weight is equally distributed across all items
  # Should raise early enough in most cases
  validate_total_weight(items, maximum_weight)
  items_to_pack = items.map(&:dup).sort_by! { |i| i[:grams].to_i }

  state = :package_empty
  while state != :packing_finished
    case state
    when :package_empty
      package_weight, package_value = 0, 0
      state = :filling_package
    when :filling_package
      validate_package_quantity(packages.count)

      items_to_pack.each do |item|
        quantity = determine_fillable_quantity_for_package(item, maximum_weight, package_weight)
        package_weight += item_weight(quantity, item[:grams])
        package_value += item_value(quantity, item[:price])
        item[:quantity] = item[:quantity].to_i - quantity
      end

      items_to_pack.reject! { |i| i[:quantity].to_i == 0 }
      state = :package_full
    when :package_full
      packages << ActiveShipping::Package.new(package_weight, dimensions, value: package_value, currency: currency)
      state = items_to_pack.any? ? :package_empty : :packing_finished
    end
  end

  packages
end