The view products.views.get_product didn't return an HttpResponse object. It returned None inst-CodePudding

Here is my code, I am getting the same error again and again.

def add_to_cart(request,uid):
    variant=request.GET.get('variant')
    product=Product.objects.get(uid=uid)
    user=request.user
    cart=Cart.objects.get_or_create(user=user, is_paid=False)
    cart_item=CartItems.objects.create(cart=cart,product=product)

    if variant:
        variant=request.GET.get('variant')
        size_variant=SizeVariant.objects.get(size_name=variant)
        cart_item.size_variant=size_variant
        cart_item.save()
        return HttpResponseRedirect(request.META.get('HTTP_REFFER'))

ValueError at /product/tommy-hilfiger-blue-jeans The view products.views.get_product didn't return an HttpResponse object. It returned None instead. Request Method: GET

Django Version: 4.0.4 Exception Type: ValueError Exception Value:
The view products.views.get_product didn't return an HttpResponse object. It returned None instead. Exception Location: C:\Users\MyPc\AppData\Local\Programs\Python\Python39\lib\site-packages\django\core\handlers\base.py, line 332, in check_response Python Executable: C:\Users\MyPc\AppData\Local\Programs\Python\Python39\python.exe Python Version: 3.9.7

CodePudding user response：

In your code, if the if variant: condition fails, then there is no HttpResponse, means it return None.

So try printing the variable variant and see whats wrong.

CodePudding user response：

Just add return HttpResponse outside if

def add_to_cart(request,uid):
    variant=request.GET.get('variant')
    product=Product.objects.get(uid=uid)
    user=request.user
    cart=Cart.objects.get_or_create(user=user, is_paid=False)
    cart_item=CartItems.objects.create(cart=cart,product=product)

    if variant:
        variant=request.GET.get('variant')
        size_variant=SizeVariant.objects.get(size_name=variant)
        cart_item.size_variant=size_variant
        cart_item.save()
        return HttpResponse(request.META.get('HTTP_REFFER'))

    return HttpResponse(0)