Django sessions save only one object - django

Question

I am building online store and want to use sessions to allow anonymous users to add items to carts before logging in .
trying to save the added items in session as a list but it saves only last object added to list
def cart(request):
user_id = request.user.id
cart_items =Cart.objects.all().filter(user_id=user_id, is_ordered=False)
ids = request.session.get('cart_id')
if ids:
for cart_id in ids:
if request.user.is_authenticated:
cart = Cart.objects.get(id=cart_id)
if cart:
cart.user = request.user
cart.save()
# get total prices
prices = []
for item in cart_items:
prices.append(item.item.price * item.qty)
total_price = sum(prices)
context = {
'items': cart_items,
'total_price': total_price
}
request.session['prices'] = prices
return render(request, 'cart.html', context)
def add_to_cart(request):
if request.user.is_authenticated:
item = Item.objects.get(pk=request.POST['item_id'])
cart = Cart.objects.filter(
user=request.user, item=item, is_ordered=False).first()
if cart:
cart.qty += 1
cart.save()
messages.success(request, 'item added to cart!')
return HttpResponseRedirect(request.META.get('HTTP_REFERER'))
else:
cart = Cart(user=request.user, item=item)
cart.save()
messages.success(request, 'item added to cart!')
else:
carts_ids = []
session_cart = request.session.get('cart_id')
item = Item.objects.get(pk=request.POST['item_id'])
if session_cart :
for cart in session_cart:
carts = Cart.objects.all().filter(id=cart, item=item)
if carts:
cart = carts.filter(item=item)[0]
print(cart.qty)
cart.qty += 1
cart.save()
else:
print('new cart')
new_cart = Cart(item=item)
new_cart.save()
carts_ids.append(new_cart.id)
request.session['cart_id'] = carts_ids
else:
print('new session')
new_cart = Cart(item=item)
new_cart.save()
carts_ids.append(new_cart.id)
request.session['cart_id'] = carts_ids
return HttpResponseRedirect(request.META.get('HTTP_REFERER'))
here are my models.py
and the full code on github i am only working now on these to views (cart and add_to_cart)
appriciate any help to get over this and to simplify my code :)

Answer 1

The idea would be that you save the whole cart in sessions so that you can reload it when the same user comes back to your website. So your code should look like this:
prices = []
itemlist=[]
for item in cart_items:
prices.append(item.item.price * item.qty)
itemlist.append(item.item, item.qty)
total_price = sum(prices)
context = {
'items': cart_items,
'total_price': total_price
}
request.session['items'] = itemlist
End then you also will need to read out this list.