Class: Coupon::Calculator::FlatAmountOff

Inherits:
Base
  • Object
show all
Defined in:
app/services/coupon/calculator/flat_amount_off.rb

Overview

Classic coupon simply applying a flat amount off to all qualifying item,
one lump sum subtracted to the whole and allocated proportionally

Instance Method Summary collapse

Constructor Details

#initialize(line_item_extractor, options = {}) ⇒ FlatAmountOff

custom options required:
:flat_amount, the $ amount to take off



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# File 'app/services/coupon/calculator/flat_amount_off.rb', line 7

def initialize(line_item_extractor, options = {})
  super
end

Instance Method Details

#calculate(discount) ⇒ Object 



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# File 'app/services/coupon/calculator/flat_amount_off.rb', line 11

def calculate(discount)
  raise ":flat_amount option not specified" if @options[:flat_amount].blank?

  base_amount = @line_item_extractor.get_base_amount_discounted
  allocated_amount = -[@options[:flat_amount].abs, base_amount].min
  Coupon::MsrpAllocator.new(@line_item_extractor).allocate(discount, allocated_amount)
end