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fab-manager/app/models/invoice_item.rb

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# frozen_string_literal: true
require 'checksum'
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# A single line inside an invoice. Can be a subscription or a reservation
class InvoiceItem < Footprintable
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belongs_to :invoice
belongs_to :subscription
has_one :invoice_item # associates invoice_items of an invoice to invoice_items of an Avoir
after_create :chain_record
after_update :log_changes
def amount_after_coupon
# deduct coupon discount
coupon_service = CouponService.new
coupon_service.ventilate(invoice.total, amount, invoice.coupon)
end
# return the item amount, coupon discount deducted, if any, and VAT excluded, if applicable
def net_amount
# deduct VAT
vat_service = VatHistoryService.new
vat_rate = vat_service.invoice_vat(invoice)
Rational(amount_after_coupon / (vat_rate / 100.00 + 1)).round.to_f
end
# return the VAT amount for this item
def vat
amount_after_coupon - net_amount
end
private
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def log_changes
return if Rails.env.test?
return unless changed?
puts "WARNING: InvoiceItem update triggered [ id: #{id}, invoice reference: #{invoice.reference} ]"
puts '---------- changes ----------'
puts changes
puts '---------------------------------'
end
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end