Question

I need to call an API function after validating a form with is_valid(). This API call can still throw exceptions which in turn may kind of invalidate a field in the form.

How can I do that? I’m looking for something like that:

def smstrade(request):
    if request.method == "POST":
        form = SomeForm(request.POST)
        if form.is_valid():
            try:
                api_call(...)
            except SomeException:
                form["field"].set_valid(False)

Answer 1

It is better to override the clean method for the field you are interested in and add your logic there. That way, you can output the appropriate error message as well.