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Versions: 13
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Stored size: 1.25 KB
Contents
class LineItem < ActiveRecord::Base
belongs_to :order
belongs_to :product
validates_presence_of :order_id, :product_id
validates_numericality_of :price
validates_numericality_of :quantity, :greater_than => 0
attr_accessible :quantity
def total_price
quantity * price
end
def total_tax(billing_address)
total_price * (applicable_tax_rate(billing_address) / 100.0).round(2)
end
def total_price_with_tax(billing_address)
total_price + total_tax(billing_address)
end
# collect all of the applicable tax rates based on where the person purchasing it is located,
# then enumerate through them and add up their rates
def applicable_tax_rate(billing_address)
raise "billing address must be an Address" unless billing_address.kind_of? Address
applicable_tax_rates = self.product.tax_rates.find_all_by_country_id(billing_address.country_id)
applicable_tax_rates += self.product.tax_rates.find_all_by_province_id(billing_address.province_id) if billing_address.province_id
# use uniq to ensure we don't charge tax too many times - it's possible to get overlapping rates between a country and its provinces
applicable_tax_rates.uniq.inject(0.0) { |sum, applicable_tax_rate| sum += applicable_tax_rate.rate }
end
end
Version data entries
13 entries across 13 versions & 1 rubygems