如何修复Django无法解压缩不可iterable int对象？

我是一个初学者，我现在正在做一个电子商务网站，在视图中，我得到了_object_404和参数，但我一直得到无法用id参数解包不可编辑的int object。我搜索了这个主题，发现pk也有同样的问题，但id不起作用（或者我没办法让它起作用，谁知道呢）。代码如下： views.py：

from django.shortcuts import render, get_object_or_404
from .models import *
from cart.forms import CartAddProductForm

def product_list(request, category_slug=None):
    category = None
    categories = Category.objects.all()
    products = Product.objects.filter(available=True)
    if category_slug:
        category = get_object_or_404(Category, slug=category_slug)
        products = products.filter(category=category)
    context = {
        'categories': categories,
        'category': category,
        'products': products,
    }
    return render(request, 'onlineshop/product/list.html', context)


def product_detail(request, id, slug):
    product = get_object_or_404(Product, id, slug=slug)
    cart_product_form = CartAddProductForm()
    context = {
        'product': product,
        'cart_product_form':cart_product_form,
    }
    return render(request, 'onlineshop/product/detail.html')

URL.py：

from django.urls import path
from . import views

app_name = 'onlineshop'

urlpatterns = [
    path('', views.product_list, name='product_list'),
    path('<slug:category_slug>/', views.product_list,
         name='product_list_by_category'),

    path('<int:id>/<slug:slug>/', views.product_detail, name='product_detail')
]

尝试：

---

是的，我以前也试过，似乎它起作用了，又出现了一个错误，我认为它仍然不正确，但谢谢，似乎还有另一个问题。

from django.db import models
from django.urls import reverse


class Category(models.Model):
    name = models.CharField(max_length=200, db_index=True)
    slug = models.SlugField(max_length=200, unique=True)

    class Meta:
        ordering = ('name',)
        verbose_name = 'category'
        verbose_name_plural = 'categories'

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('onlineshop:product_list_by_category', args=[self.slug])


class Product(models.Model):
    category = models.ForeignKey(
        Category, related_name='product', on_delete=models.CASCADE)
    name = models.CharField(max_length=200, db_index=True)
    slug = models.SlugField(max_length=200, db_index=True)
    image = models.ImageField(upload_to='products/%Y/%m/%d', blank=True)
    description = models.TextField(blank=True)
    price = models.DecimalField(max_digits=10, decimal_places=2)
    available = models.BooleanField(default=True)
    created = models.DateTimeField(auto_now_add=True)
    updated = models.DateTimeField(auto_now=True)

    class Meta:
        ordering = ('name',)
        index_together = (('id', 'slug'))

    def __str__(self):
        return self.name

    def get_absolute_url(self):
        return reverse('onlineshop:product_detail', args=[self.id, self.slug])

product = get_object_or_404(Product, id=id, slug=slug)