How to add products to cart using sessions as a guest in django

settings.py

 CACHES = {
    'default': {
    'BACKEND': 'django.core.cache.backends.db.DatabaseCache',
    'LOCATION': 'my_cache_table',
    }
}

SESSION_ENGINE = "django.contrib.sessions.backends.cache"

models.py

class Product(models.Model):
    title = models.CharField(max_length=255)
    slug = models.SlugField(default='-')
    description = models.TextField()
    unit_price = models.FloatField()
    inventory = models.IntegerField()
    last_update = models.DateTimeField(auto_now=True)
    collection = models.ForeignKey(Collection, on_delete=models.PROTECT)
    promotions = models.ManyToManyField(Promotion)

class Cart(models.Model):
    created_at = models.DateTimeField(auto_now_add=True)

class CartItem(models.Model):
    cart = models.ForeignKey(Cart, on_delete=models.CASCADE)
    product = models.ForeignKey(Product, on_delete=models.CASCADE)
    quantity = models.IntegerField()

I want to add the products in the cart using session through cache. how can I make a key named as 'cart' in request.session and add those product's id in it. I initially tried to set 'cart' key using request.session.setdefault('cart', list()) but then I read the django documentation and it says that the items should be in the form of dictionaries(according to conventions). So what can I do to store the products in the cart for guest users?

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