[Django]-Argument of type 'NoneType' is not iterable when trying to update a model object

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3👍

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Looks like it is because wrong indention in your clean method. Current it doesn’t return anything, i.e it returns None, but must return the self.cleaned_data. All of your clean method code is under if, which will raise an exception. And if this if is not matched, None is returned.

Try this:

class priceform(ModelForm):
    # ...
    def clean(self):
        if self.cleaned_data and 'modelname' not in self.cleaned_data:
            raise forms.ValidationError("Some error message")
        if not self.is_update:
            return self.cleaned_data
        return self.cleaned_data

    # ...
👤stalk

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