Class: ActiveShipping::ShipmentPacker
- Inherits:
-
Object
- Object
- ActiveShipping::ShipmentPacker
- 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
-
.pack(items, dimensions, maximum_weight, currency) ⇒ Object
items - array of hashes containing quantity, grams and price.
Class Method Details
.pack(items, dimensions, maximum_weight, currency) ⇒ Object
items - array of hashes containing quantity, grams and price.
ex. [{:quantity => 2, :price => 1.0, :grams => 50}]
dimensions - [5.0, 15.0, 30.0]
maximum_weight - maximum weight in grams
currency - ISO currency code
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# File 'lib/active_shipping/shipment_packer.rb', line 14 def self.pack(items, dimensions, maximum_weight, currency) return [] if items.empty? packages = [] # Naive in that it assumes weight is equally distributed across all items # Should raise early enough in most cases total_weight = 0 items.map!(&:symbolize_keys).each do |item| total_weight += item[:quantity].to_i * item[:grams].to_i if item[:grams].to_i > maximum_weight raise OverweightItem, "The item with weight of #{item[:grams]}g is heavier than the allowable package weight of #{maximum_weight}g" end if total_weight > maximum_weight * EXCESS_PACKAGE_QUANTITY_THRESHOLD raise ExcessPackageQuantity, "Unable to pack more than #{EXCESS_PACKAGE_QUANTITY_THRESHOLD} packages" end end items = 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 items.each do |item| quantity = if item[:grams].to_i <= 0 item[:quantity].to_i else # Grab the max amount of this item we can fit into this package # Or, if there are fewer than the max for this item, put # what is left into this package [(maximum_weight - package_weight) / item[:grams].to_i, item[:quantity].to_i].min end item_weight = quantity * item[:grams].to_i item_value = quantity * Package.cents_from(item[:price]) package_weight += item_weight package_value += item_value item[:quantity] = item[:quantity].to_i - quantity end items.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.any? ? :package_empty : :packing_finished end end packages end |