Splitting packages in Spree Active Shipping

base.rb

def packages(order)
  split_packages = Array.new
  number_of_packages = 1
  multiplier = Spree::ActiveShipping::Config[:unit_multiplier]
  default_weight = Spree::ActiveShipping::Config[:default_weight]

  weight = order.line_items.inject(0) do |weight, line_item|
    item_weight = line_item.variant.weight.present? ? line_item.variant.weight : default_weight
    weight + (line_item.quantity * item_weight * multiplier)
  end
  
  if weight > MAX_WEIGHT_PER_PACKAGE
    number_of_packages = (weight.to_i / MAX_WEIGHT_PER_PACKAGE)
    number_of_packages += 1 if weight % MAX_WEIGHT_PER_PACKAGE > 0
  end

  packages_weight = weight
  (1..number_of_packages).each do 
    if packages_weight > MAX_WEIGHT_PER_PACKAGE
      package_weight = MAX_WEIGHT_PER_PACKAGE
      packages_weight -= MAX_WEIGHT_PER_PACKAGE
    else
      package_weight = packages_weight
    end
    puts package_weight
    Spree::ActiveShipping::Config[:units].to_sym
    split_packages << Package.new(package_weight, [], :units => Spree::ActiveShipping::Config[:units].to_sym)
  end

  split_packages
end