Convert function base view to class base view in Django - django-views

Question

how to convert these View to Class Base View, this view for add order new order and I wanna
change this View to Class Base but I cant
def add_user_order(request):
new_order_form = UserNewOrderForm(request.POST or None)
if new_order_form.is_valid():
order = Order.objects.filter(owner_id=request.user.id, is_paid=False).first()
if order is None:
order = Order.objects.create(owner_id=request.user.id, is_paid=False)
product_id = new_order_form.cleaned_data.get('product_id')
count = new_order_form.cleaned_data.get('count')
if count < 0:
count = 1
product = Product.objects.get_by_id(product_id=product_id)
order.orderdetail_set.create(product_id=product.id, price=product.price, count=count)
# todo: redirect user to user panel
return redirect(f'products/{product_id}/{product.title.replace(" ", "-")}')
return redirect('/')

Answer 1

You can make use of a FormView [Django-doc] where the form_valid function will do most of the logic:
class UserAddOrderView(FormView):
form_class = UserNewOrderForm
def form_valid(self, form):
order, __ = Order.objects.get_or_create(owner_id=request.user.id, is_paid=False)
self.product_id = product_id = new_order_form.cleaned_data.get('product_id')
count = new_order_form.cleaned_data.get('count')
if count < 0:
count = 1
order.orderdetail_set.create(product_id=product_id, price=product.price, count=count)
return super().form_valid(form)
def get_success_url(self):
return f'products/{product_id}/{product.title.replace(" ", "-")}'
It is however not a good idea to construct URLs manually. You can work with the reverse(…) function [Django-doc]. The same with slugs, do not construct slugs yourself, but use slugify(…) [Django-doc]. You should normally also save the slug to the model to which it belongs to make (fast) lookups possible.