我正在尝试使用django实现购物车应用程序（来自django，例如第7章）。但是从我的产品列表中，当我点击添加到购物车时，我应该被带到购物车详细信息（detail.html模板）页面而不是我收到错误<Product: Tablet> is not JSON serializable
我使用以下cart.py文件。怀疑错误来自__iter__方法。请帮忙
cart.py
from django.conf import settings
from resource_manager.models import Product
class Cart(object):
def __init__(self, request):
"""
Initialize the cart.
"""
self.session = request.session
cart = self.session.get(settings.CART_SESSION_ID)
if not cart:
# save an empty cart in the session
cart = self.session[settings.CART_SESSION_ID] = {}
self.cart = cart
def add(self, product, quantity=1, update_quantity=False):
"""
Add a product to the cart or update its quantity.
:param product:
:param quantity:
:param update_quantity:
:return:
"""
product_id = str(product.id)
if product_id not in self.cart:
self.cart[product_id] = {'quantity': 0}
# self.cart[product_id] = {'quantity': 0, 'price': str(product.price)}
if update_quantity:
self.cart[product_id]['quantity'] = quantity
else:
self.cart[product_id]['quantity'] += quantity
self.save()
def save(self):
# update the session cart
self.session[settings.CART_SESSION_ID] = self.cart
# mark the session as "modified" to make sure it is saved
self.session.modified = True
def remove(self, product):
"""
Remove a product from the cart.
:param product:
:return:
"""
product_id = str(product.id)
if product_id in self.cart:
del self.cart[product_id]
self.save()
def __iter__(self):
"""
Iterate over the items in the cart and get the products
from the database.
"""
product_ids = self.cart.keys()
# get the product objects and add them to the cart
products = Product.objects.filter(id__in=product_ids)
for product in products:
self.cart[str(product.id)]['product'] = product
# self.cart[str(product.id)]['product'] = product
for item in self.cart.values():
# item['price'] = Decimal(item['price'])
# item['total_price'] = item['price'] * item['quantity']
yield item
def __len__(self):
"""
Count all items in the cart.
"""
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):
# remove cart from session
del self.session[settings.CART_SESSION_ID]
self.session.modified = True
这是Product模型
class Product(models.Model):
NAME_CHOICES = (
('Radio', 'Radio'),
('Tablet', 'Tablet'),
('Mat', 'Mat'),
('Workbook', 'Workbook'),
)
name = models.CharField(max_length=15, choices=NAME_CHOICES, unique=True)
image = models.ImageField(upload_to='resource_manager/%Y/%m/%d', blank=True)
# available = models.BooleanField(editable=False)
created = models.DateTimeField(auto_now_add=True)
updated = models.DateTimeField(auto_now=True)
@property
def is_available(self):
if self.stock_count > 0:
available = True
else:
available = False
return available
@property
def stock_count(self):
count = Equipment.objects.filter(equipment_type=self.name).count()
return count
def __str__(self):
return self.name
def get_absolute_url(self):
return reverse('resource_manager:product_detail',
args=[self.pk])