Django formsets: make first required?

Question

These formsets are exhibiting exactly the opposite behavior that I want. My view is set up like this: ``` def post(request): # TODO: handle vehicle formset VehicleFormSetFactory = formset_factory(VehicleForm, extra=1) if request.POST: vehicles_formset = VehicleFormSetFactory(request.POST) else: vehicles_formset = VehicleFormSetFactory() ``` And my template looks like this: ```

{{ vehicles_formset.management_form }} {% for form in vehicles_formset.forms %}

Vehicle {{forloop.counter}}

{% include "form.html" %}

{% endfor %}

``` That way it initially generates only 1 form, like I want. But I want that one form to be required! When I dynamically add blank forms with JavaScript and `vehicles_formset.empty_form` all those extra forms are required, which I don't want. From the docs: The formset is smart enough to ignore extra forms that were not changed. This is the behavior the first form is exhibiting (not what I want) but not the be…

Accepted Answer

Found a better solution:

```
class RequiredFormSet(BaseFormSet):
    def __init__(self, *args, **kwargs):
        super(RequiredFormSet, self).__init__(*args, **kwargs)
        for form in self.forms:
            form.empty_permitted = False
```

Then create your formset like this:

```
MyFormSet = formset_factory(MyForm, formset=RequiredFormSet)
```

I really don't know why this wasn't an option to begin with... but, whatever. It only took a few hours of my life to figure out.

This will make all the forms required. You could make just the first one required by setting `self.forms[0].empty_permitted` to `False`.

Django formsets: make first required?

Solution

Problem