Don't allow concurrent login from a user

Hi,

Need suggestion on how i can implement the below 

a user U1 is logged into my website.

he opens incognito mode and again tries to login, expecatation is that his login will be denied saying you are already logged in.

i tried below but seems not working. ( on stack overflow there are answers but it's so complex) 

```

def login_view(request): form = LoginForm(request.POST or None) msg = None if request.method == "POST": if form.is_valid(): username = form.cleaned_data.get("username") password = form.cleaned_data.get("password") user = authenticate(username=username, password=password) if request.user.is_authenticated: msg="User already logged in, multiple log in not allowed " return redirect("/") if user is not None: login(request, user) return redirect("/") else: msg = 'Invalid credentials' else: msg = 'Error validating the form' return render(request, "accounts/login.html", {"form": form, "msg" : msg})

```

Thanks 

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