Class: Calculator::RelatedProductDiscount

Inherits:
Calculator
  • Object
show all
Defined in:
app/models/calculator/related_product_discount.rb

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.description ⇒ Object 



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# File 'app/models/calculator/related_product_discount.rb', line 4

def self.description
  I18n.t("related_product_discount")
end

.register ⇒ Object 



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# File 'app/models/calculator/related_product_discount.rb', line 8

def self.register
  super
  Coupon.register_calculator(self)
end

Instance Method Details

#compute(object) ⇒ Object 



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# File 'app/models/calculator/related_product_discount.rb', line 13

def compute(object)
  if object.is_a?(Array)
    return if object.empty?
    order = object.first.order
  else
    order = object
  end

  return unless eligible?(order)
  total = order.line_items.inject(0) do |total, line_item|
    relations =  Relation.find(:all, :conditions => ["discount_amount <> 0.0 AND relatable_type = ? AND relatable_id = ?", "Product", line_item.variant.product.id])
    discount_applies_to = relations.map {|rel| rel.related_to.master }

    order.line_items.each do |li|
      if discount_applies_to.include? li.variant
        discount = relations.detect {|rel| rel.related_to.variant == li.variant}.discount_amount

        total += if li.quantity < line_item.quantity
          (discount * li.quantity)
        else
          (discount * line_item.quantity)
        end
      end
    end

    total
  end

  total == 0 ? nil : total
end

#eligible?(order) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'app/models/calculator/related_product_discount.rb', line 44

def eligible?(order)
  order.line_items.any? { |line_item| Relation.exists?(["discount_amount <> 0.0 AND relatable_type = ? AND relatable_id = ?", "Product", line_item.variant.product.id])}
end