Class: ActiveMerchant::Shipping::ShipmentPacker

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

Defined Under Namespace

Classes: OverweightItem

Class Method Summary collapse

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



12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
 
# File 'lib/active_shipping/shipping/shipment_packer.rb', line 12

def self.pack(items, dimensions, maximum_weight, currency)
  items = items.map(&:symbolize_keys).map { |item| [item] * item[:quantity].to_i }.flatten
  packages = []
  state = :package_empty

  while state != :packing_finished
    case state
    when :package_empty
      package_weight, package_value = 0, 0
      state = :filling_package
    when :filling_package
      item = items.shift
      item_weight, item_price = item[:grams].to_i, Package.cents_from(item[:price])

      if item_weight > maximum_weight
        raise OverweightItem, "The item with weight of #{item_weight}g is heavier than the allowable package weight of #{maximum_weight}g"
      end

      if (package_weight + item_weight) <= maximum_weight
        package_weight += item_weight
        package_value  += item_price
        state = :package_full if items.empty?
      else
        items.unshift(item)
        state = :package_full
      end
    when :package_full
      packages << ActiveMerchant::Shipping::Package.new(package_weight, dimensions, :value => package_value, :currency => currency)
      state = items.any? ? :package_empty : :packing_finished
    end
  end

  packages
end