[Django]-Django: How to check if the user left all fields blank (or to initial values)?

Guess I have to answer my own question.

Apparently, there’s an undocumented Form function: has_changed()

>>> f = MyForm({})
>>> f.has_changed()
False
>>> f = MyForm({'name': 'test'})
>>> f.has_changed()
True
>>> f = MyForm({'name': 'test'}, initial={'name': 'test'})
>>> f.has_changed()
False

So this would do nicely as the replacement for form_is_blank() (reverted of course).

Belmin Fernandez

[Django]-Django – {% csrf_token %} was used in a template, but the context did not provide the value

To get this functionality work for subset of Forms used in the actual <form> tag you also need to define

class YourForm(forms.ModelForm):
    def full_clean(self):
        if not self.has_changed():
            self._errors = ErrorDict()
            return

        return super(YourForm, self).full_clean()

so when the user is prompted to fix validation errors it doesnt display errors from the forms which you want to validate only if some value isn’t blank (or default).

Jan Matějka

You should set required=False for all fields in the form and override the clean method to do custom validation. See the current documentation for more.

Mikhail Korobov

If you have put required=True in your forms field or in the model blank=False so is_valid() should return False.

mouad

Use modelformset_Factory and pass your custom formset to it

atufa shireen

Source:stackexchange.com