Class: Shipping::Md5HashItem

Inherits:
Object
  • Object
show all
Defined in:
app/services/shipping/md5_hash_item.rb

Overview

Service object: md5 hash item.

Defined Under Namespace

Classes: Result

Constant Summary collapse

RELEVANT_ITEM_VOLUME_RATIO_THRESHOLD =

Threshold for relevant item volume ratio.

0.005
RELEVANT_ITEM_WEIGHT_RATIO_THRESHOLD =

Threshold for relevant item weight ratio.

0.002

Class Method Summary collapse

Class Method Details

.process(item_hash, qty_override: nil) ⇒ Object 



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# File 'app/services/shipping/md5_hash_item.rb', line 24

def self.process(item_hash, qty_override: nil)
  # Shortcut if an item is passed directly
  is_item = false
  if item_hash.instance_of?(::Item)
    item_hash = { item_hash => qty_override || 1 }
    is_item = true
  end
  # FIRST PASS ALL GOODS ITEMS: Eliminate non goods
  item_hash.delete_if { |item, _qty| !item.is_goods? }
  tot_shipping_volume = begin
    item_hash.sum { |item, qty| item.total_shipping_volume * qty }
  rescue StandardError
    nil
  end
  # Iterate through our item hash and explode kits
  tot_shipping_weight = begin
    item_hash.sum { |item, qty| item.total_shipping_weight * qty }
  rescue StandardError
    nil
  end
  # Iterate through our item hash and explode kits
  r1 = Shipping::ItemKitExploder.process(item_hash)
  full_item_id_hash = r1.full_item_id_hash
  kit_item_ids = r1.kit_item_ids
  items_string = full_item_id_hash.map { |k, v| "#{k}:#{v}" }.join(',')
  md5 = Digest::MD5.hexdigest(items_string.to_s)
  Rails.logger.debug { "Shipping::Md5HashItem: #{items_string} -> #{md5}" }

  # SECOND PASS ALL RELEVANT ITEMS: Eliminate small items based on if it contributes less than 0.5% by volume and 2% by weight of the total, taking quantities into account
  if is_item || tot_shipping_volume.nil? || tot_shipping_volume.zero? || tot_shipping_weight.nil? || tot_shipping_weight.zero?
    # skip, we have no item weight defined whatsoever, so just keep this packing which might be useful for what can only be a limited one (or two)-off item, and move on
    relevant_full_item_id_hash = full_item_id_hash
    relevant_kit_item_ids = kit_item_ids
    relevant_items_string = items_string
    relevant_md5 = md5
    Rails.logger.debug { "Shipping::Md5HashItem: item volume and/or weight not defined, skipping! relevant #{relevant_items_string} -> #{relevant_md5}" }
  else
    Rails.logger.debug { "Shipping::Md5HashItem: tot_shipping_volume: #{tot_shipping_volume} in^3, tot_shipping_weight: #{tot_shipping_weight} lbs" }
    Rails.logger.debug do
      "Shipping::Md5HashItem: sku, volume, percentage, weight, percentage: #{item_hash.map do |item, qty|
        [item.sku, item.shipping_volume, (100.0 * item.shipping_volume * qty / tot_shipping_volume).round(4), item.shipping_weight || item.base_weight, (100.0 * (item.shipping_weight || item.base_weight) * qty / tot_shipping_weight).round(3)]
      end}"
    end
    item_hash.delete_if { |item, qty| ((item.shipping_volume * qty) / tot_shipping_volume) < RELEVANT_ITEM_VOLUME_RATIO_THRESHOLD && (((item.shipping_weight || item.base_weight) * qty) / tot_shipping_weight) < RELEVANT_ITEM_WEIGHT_RATIO_THRESHOLD }

    # Iterate through our item hash and explode kits
    r2 = Shipping::ItemKitExploder.process(item_hash)
    relevant_full_item_id_hash = r2.full_item_id_hash
    relevant_kit_item_ids = r2.kit_item_ids
    relevant_items_string = relevant_full_item_id_hash.map { |k, v| "#{k}:#{v}" }.join(',')
    relevant_md5 = Digest::MD5.hexdigest(relevant_items_string.to_s)
    Rails.logger.debug do
      "Shipping::Md5HashItem: relevant sku, volume, percentage, weight, percentage: #{item_hash.map do |item, qty|
        [item.sku, item.shipping_volume, (100.0 * item.shipping_volume * qty / tot_shipping_volume).round(4), item.shipping_weight || item.base_weight, (100.0 * (item.shipping_weight || item.base_weight) * qty / tot_shipping_weight).round(3)]
      end}"
    end
    Rails.logger.debug { "Shipping::Md5HashItem: relevant #{relevant_items_string} -> #{relevant_md5}" }
  end

  Result.new(md5: md5, items_string: items_string, full_item_id_hash: full_item_id_hash, kit_item_ids: kit_item_ids, relevant_md5: relevant_md5, relevant_items_string: relevant_items_string, relevant_full_item_id_hash: relevant_full_item_id_hash,
relevant_kit_item_ids: relevant_kit_item_ids)
end