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Contents
module Spree
# A calculator for promotions that calculates a percent-off discount
# for all matching products in an order. This should not be used as a
# shipping calculator since it would be the same thing as a flat percent
# off the entire order.
class Calculator::PercentPerItem < Calculator
preference :percent, :decimal, default: 0
def self.description
Spree.t(:percent_per_item)
end
def compute(object=nil)
return 0 if object.nil?
object.line_items.reduce(0) do |sum, line_item|
sum += value_for_line_item(line_item)
end
end
private
# Returns all products that match this calculator, but only if the calculator
# is attached to a promotion. If attached to a ShippingMethod, nil is returned.
# Copied from per_item.rb
def matching_products
if compute_on_promotion?
self.calculable.promotion.rules.map do |rule|
rule.respond_to?(:products) ? rule.products : []
end.flatten
end
end
def value_for_line_item(line_item)
if compute_on_promotion?
return 0 unless matching_products.blank? or matching_products.include?(line_item.product)
end
((line_item.price * line_item.quantity) * preferred_percent) / 100
end
# Determines wether or not the calculable object is a promotion
def compute_on_promotion?
@compute_on_promotion ||= self.calculable.respond_to?(:promotion)
end
end
end
Version data entries
13 entries across 13 versions & 1 rubygems