Issue
If I add a product to the cart once is fine and the carts are created. But if I add it again then the above error occurs. In addition, when trying to edit or delete the created cart, an error also occurs: "TypeError at /admin/carts/cartitem/3/change/ str returned non-string (type Product)"
I have Django project with follow modules: Model Product
from django.db import models
from category.models import Category
from django.shortcuts import reverse
class Product(models.Model):
product_name = models.CharField(max_length=256, unique=True)
slug = models.SlugField(max_length=256, unique=True)
description = models.TextField(max_length=512, blank=True)
price = models.IntegerField()
images = models.ImageField(upload_to='photos/products')
stock = models.IntegerField()
is_available = models.BooleanField(default=True)
category = models.ForeignKey(Category, on_delete=models.CASCADE)
create_date = models.DateTimeField(auto_now_add=True)
modified_date = models.DateTimeField(auto_now=True)
def get_url(self):
return reverse('store:product-detail', args=[self.category.slug, self.slug])
def __str__(self):
return self.product_name
Model Cart
from django.db import models
from store.models import Product
class Cart(models.Model):
cart_id = models.CharField(max_length=256, blank=True)
date_added = models.DateField(auto_now_add=True)
def __str__(self):
return self.cart_id
class CartItem(models.Model):
product = models.ForeignKey(Product, on_delete=models.CASCADE)
cart = models.ForeignKey(Cart, on_delete=models.CASCADE)
quantity = models.IntegerField()
is_active = models.BooleanField(default=True)
def __str__(self):
return self.product
Carts views
from django.shortcuts import render, redirect
from store.models import Product
from .models import Cart, CartItem
def _cart_id(request):
cart = request.session.session_key
if not cart:
cart = request.session.create()
return cart
def add_cart(request, product_id):
product = Product.objects.get(id=product_id) # get the product
try:
cart = Cart.objects.get(cart_id=_cart_id(request))
except Cart.DoesNotExist:
cart = Cart.objects.create(cart_id=_cart_id(request))
cart.save()
try:
cart_item = CartItem.objects.get(product=product, cart=cart)
cart_item.quantity += 1
cart_item.save()
except CartItem.DoesNotExist:
cart_item = CartItem.objects.create(
product=product,
quantity=1,
cart=cart,
)
cart_item.save()
return redirect('carts:cart-view')
def cart_view(request):
return render(request, 'store/cart.html')
Carts urls
from django.urls import path
from .views import cart_view, add_cart
app_name = 'carts'
urlpatterns = [
path('', cart_view, name='cart-view'),
path('add_cart/<int:product_id>/', add_cart, name='add-cart'),
]
And tags in html
{% url 'carts:add-cart' single_product.id %} {% url 'carts:add-cart' product.id %}
Solution
It is just an Indentation issue. Remove return redirect('carts:cart-view')
from except block and put it in view function as follow:
def add_cart(request, product_id):
product = Product.objects.get(id=product_id) # get the product
try:
#Logic
except Cart.DoesNotExist:
#Logic
try:
#Logic
except CartItem.DoesNotExist:
#Logic
return redirect('carts:cart-view')
Answered By - Manoj Kamble
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