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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
attr_accessible :preferred_percent
def self.description
I18n.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 the promotion's rule.
def matching_products
@matching_products ||= if compute_on_promotion?
self.calculable.promotion.rules.map(&:products).flatten
end
end
# Calculates the discount value of each line item. Returns zero
# unless the product is included in the promotion rules.
def value_for_line_item(line_item)
if compute_on_promotion?
return 0 unless matching_products.include?(line_item.product)
end
line_item.price * line_item.quantity * preferred_percent
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
10 entries across 10 versions & 2 rubygems