views.py

@login_required_message
@login_required
def student_registrations(request):
    registrations = Registration.objects.filter(student=request.user.student).order_by(
        "registration_date"
    )

    # paginate the registrations
    paginated_registrations = Paginator(registrations, 2)
    page_list = request.GET.get("page")
    paginated_registrations = paginated_registrations.get_page(page_list)
    context = {
        "title": "My Registrations",
        "paginated_registrations": paginated_registrations,
    }
    return render(request, "studentregistration/registrations.html", context)


@login_required_message
@login_required
def register(request, code):
    module = get_object_or_404(Module, code=code)

    # incase user tries to re-register buy copying the register url
    registration, created = Registration.objects.get_or_create(
        module=module, student=request.user.student
    )
    if created:
        messages.success(request, f"Successfully registered to {module.name}")
    else:
        messages.success(request, f"You've already registered to {module.name}")

    # redirect to previous page that sent user here
    # or build the module page url and redirect user there
    module_page = reverse("studentregistration:module_details", args=[module.code])
    redirect_to = request.META.get("HTTP_REFERER", module_page)
    return redirect(redirect_to)


@login_required_message
@login_required
def unregister(request, code):
    registration = get_object_or_404(
        Registration, module__code=code, student=request.user.student
    )
    module = registration.module
    if request.method == "POST":
        registration.delete()
        messages.success(request, f"Successfully unregistered from {module.name}")
        return redirect(
            reverse("studentregistration:module_details", args=[module.code])
        )
        # module_page = reverse("studentregistration:module_details", args=[module.code])
        # redirect_to = request.META.get("HTTP_REFERER", module_page)
        # return redirect(redirect_to)

    context = {"title": "Unregister", "module": module, "registration": registration}
    return render(request, "studentregistration/unregister.html", context)


def error_404(request, exception):
    return render(request, "studentregistration/404.html", {"title": "404 Error"})