Allow hooking invalid form submission for a WizardView step

[KyeRussell]

Looking here:

https://github.com/jazzband/django-formtools/blob/master/formtools/wizard/views.py#L294

It appears that there is no way for me to do anything when a step's form submission fails, without overriding all of post() to put an else: on the if form.is_valid() conditional.

Firstly, am I right in this assertion?

If so, it'd be beneficial for me personally to have this ability. I don't want to intercept and provide a new response, I just need to do some background logging.

[frague59]

Hi,

I've the same issue, it should be very interesting to add this hook for step validations : I've some ModelForm + ModelFormset (having the ModelForm as FK of the ModelFormset) that could benefit of it.
For now, I validate the formset with client-side JS, which is not perfect, because I do not want to hack the post() method...

[KyeRussell]

My particular issue was sidestepped by messing with some form code. It is not ideal in my case, and can foresee circumstances in which I'd still want my original request.

[TTorture]

I might have a similar issue: I have two steps using a ModelForm and a ModelFormset.. One of these forms does not validate and I am lacking a proper way to log or debug.