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# @api private
# @note This is a helper class for Tax::OrderAdjuster. It is marked as api
# private because taxes should always be calculated on the entire order, so
# external code should call Tax::OrderAdjuster instead of Tax::ItemAdjuster.
module Spree
module Tax
# Adjust a single taxable item (line item or shipment)
class ItemAdjuster
attr_reader :item, :order
include TaxHelpers
# @param [Spree::LineItem,Spree::Shipment] item to adjust
# @param [Hash] options like already known tax rates for the order's zone
def initialize(item, options = {})
@item = item
@order = @item.order
# set instance variable so `TaxRate.match` is only called when necessary
@rates_for_order = options[:rates_for_order]
@rates_for_default_zone = options[:rates_for_default_zone]
end
# This updates the amounts for adjustments which already exist and
# creates and remove adjustments as needed to match the applicable
# (geographically and category-wise) tax rates.
def adjust!
rates = rates_for_item(item)
tax_adjustments = item.adjustments.select(&:tax?)
active_adjustments = rates.map do |rate|
# Find an existing adjustment from the same source.
# All tax adjustments already have source_type == 'Spree::TaxRate' so
# we need only check source_id.
adjustment = tax_adjustments.detect{|a| a.source_id == rate.id }
if adjustment
adjustment.update!
adjustment
else
# Create a new adjustment
rate.adjust(nil, item)
end
end
unmatched_adjustments = tax_adjustments - active_adjustments
# Remove any tax adjustments tied to rates which no longer match
item.adjustments.destroy(unmatched_adjustments)
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems