I have a cart app in my Django Ecommerce web-site and when I click on update, when I need to update item quantity in the cart, I get an error [<class ‘decimal.ConversionSyntax’>], which highlights this snippet in onlineshop/base.html : {{ cart.get_total_price }}GEL base.html:
{% load static %}
<!DOCTYPE html>
<html lang="en" dir="ltr">
<head>
<meta charset="utf-8">
<title>{% block title %}My Shop{% endblock %}</title>
<link href="{% static "css/base.css" %}" rel="stylesheet">
</head>
<body>
<div id="header">
<a href="/" class="logo">My Shop</a>
</div>
<div id="subheader">
<div class="cart">
{% with total_items=cart|length %}
{% if total_items > 0 %}
Your cart:
<a href="{% url "cart:cart_detail" %}">
{{ total_items }} item{{ total_items|pluralize }},
{{ cart.get_total_price }}GEL
</a>
{% else %}
Your cart is empty
{% endif %}
{% endwith %}
</div>
</div>
<div id="content">
{% block content %}
{% endblock %}
</div>
</body>
</html>
cart.py:
from decimal import Decimal
from django.conf import settings
from onlineshop.models import Product
class Cart(object):
def save(self):
self.session.modified = True
def __init__(self, request):
self.session = request.session
cart = self.session.get(settings.CART_SESSION_ID)
if not cart:
cart = self.session[settings.CART_SESSION_ID]={}
self.cart = cart
def add(self, product, quantity=1, override_quantity=False):
product_id = str(product.id)
if product_id not in self.cart:
self.cart[product_id]={'quantity':0, 'price':str(product.price)}
if override_quantity:
self.cart[product_id]['quantity'] = quantity
else:
self.cart[product_id]['quantity'] += quantity
self.save()
def remove(self, product):
product_id = str(product.id)
if product_id in self.cart:
del self.cart[product_id]
self.save()
def __iter__(self):
product_ids = self.cart.keys()
products = Product.objects.filter(id__in=product_ids)
cart = self.cart.copy()
for product in products:
cart[str(product.id)]['product'] = product
for item in cart.values():
item['price'] = Decimal(item['price'])
item['total_price'] = item['price'] * item['quantity']
yield item
def __len__(self):
return sum(item['quantity'] for item in self.cart.values())
def get_total_price(self):
return sum(Decimal(item['price'] * item['quantity']) for item in self.cart.values())
def clear(self):
del self.session[settings.CART_SESSION_ID]
self.save()