问未定义名称'get_total_discount_item_price‘

EN

{% for object in orders %}
            <div class="row justify-content-start">
                <div class="col col-lg-5 col-md-6 mt-5 cart-wrap ftco-animate">
                    <div class="cart-total mb-3">
                        <h3>Cart Totals</h3>
                        <p class="d-flex">
                            <span>Subtotal</span>
                {% if object.get_total %}


                <span>  ${{ object.get_total }}</span>
                        </p>
               {% endif %}
                        <p class="d-flex">
                            <span>Delivery</span>
                            <span>$0.00</span>
                        </p>
                        <p class="d-flex">
                            <span>Discount</span>
                            <span>$3.00</span>
                        </p>
                        <hr>
                        <p class="d-flex total-price">
                            <span>Total</span>
                            <span>$17.60</span>
                        </p>
                    </div>
                    <p class="text-center"><a href="{% url 'core:checkout' %}" class="btn btn-primary py-3 px-4">Proceed to Checkout</a></p>
                </div>
            </div>
        {% endfor %}

class OrderItem(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    item = models.ForeignKey(Item, on_delete=models.CASCADE)
    ordered = models.BooleanField(default=False)
    quantity = models.IntegerField(default=1)

    def __str__(self):
        return f"{self.quantity} of {self.item.title}"

    def get_total_item_price(self):
        return self.quantity * self.item.price

    def get_total_discount_item_price(self):
        return self.quantity * self.item.discount_price

    def get_final_price(self):
        if self.item.discount_price:
            return get_total_discount_item_price()
        return self.get_total_item_price()

class Order(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    items = models.ManyToManyField(OrderItem)
    start_date = models.DateTimeField(auto_now_add=True)
    ordered_date = models.DateTimeField()
    ordered = models.BooleanField(default=False)

    def __str__(self):
        return self.user.username

    def get_total(self):
        total = 0
        for order_item in self.items.all():
            total += order_item.get_final_price()
        return total

def cart(request):
    context = {'items': OrderItem.objects.all(), 'orders': Order.objects.all()}
    return render(request, 'ecommerceapp/cart.html', context)