module Spree class StockItem < Spree::Base acts_as_paranoid with_options inverse_of: :stock_items do belongs_to :stock_location, class_name: 'Spree::StockLocation' belongs_to :variant, class_name: 'Spree::Variant', counter_cache: true end has_many :stock_movements, inverse_of: :stock_item validates :stock_location, :variant, presence: true validates :variant_id, uniqueness: { scope: [:stock_location_id, :deleted_at] }, allow_blank: true validates :count_on_hand, numericality: { greater_than_or_equal_to: 0, less_than_or_equal_to: 2**31 - 1, only_integer: true }, if: :verify_count_on_hand? delegate :weight, :should_track_inventory?, to: :variant delegate :name, to: :variant, prefix: true after_save :conditional_variant_touch, if: :changed? after_touch { variant.touch } after_destroy { variant.touch } self.whitelisted_ransackable_attributes = ['count_on_hand', 'stock_location_id'] self.whitelisted_ransackable_associations = ['variant'] scope :with_active_stock_location, -> { joins(:stock_location).merge(Spree::StockLocation.active) } def backordered_inventory_units Spree::InventoryUnit.backordered_for_stock_item(self) end def adjust_count_on_hand(value) self.with_lock do set_count_on_hand(count_on_hand + value) end end def set_count_on_hand(value) self.count_on_hand = value process_backorders(count_on_hand - count_on_hand_was) self.save! end def in_stock? self.count_on_hand > 0 end # Tells whether it's available to be included in a shipment def available? self.in_stock? || self.backorderable? end def variant Spree::Variant.unscoped { super } end def reduce_count_on_hand_to_zero self.set_count_on_hand(0) if count_on_hand > 0 end private def verify_count_on_hand? count_on_hand_changed? && !backorderable? && (count_on_hand < count_on_hand_was) && (count_on_hand < 0) end # Process backorders based on amount of stock received # If stock was -20 and is now -15 (increase of 5 units), then we should process 5 inventory orders. # If stock was -20 but then was -25 (decrease of 5 units), do nothing. def process_backorders(number) if number > 0 backordered_inventory_units.first(number).each do |unit| unit.fill_backorder end end end def conditional_variant_touch # the variant_id changes from nil when a new stock location is added stock_changed = (count_on_hand_changed? && count_on_hand_change.any?(&:zero?)) || variant_id_changed? if !Spree::Config.binary_inventory_cache || stock_changed variant.touch end end end end