[Solved]-Django ModelForm Validation

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19👍

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Just solved it in pretty simple way. Adding the answer here in case it’s helpful to anyone else.

The Django docs state that

…a model form instance bound to a model object will contain a self.instance attribute that gives model form methods access to that specific model instance.

So rather than check if the ModelForm has an image value, I just check whether the image value has changed from the saved instance. The form validation now looks like this:

class ProductForm(forms.ModelForm):
    class Meta:
        model = Product
        fields = ('image',)

    def clean_image(self):
        image = self.cleaned_data.get('image', False)
        if not self.instance.image == image:
            # validate image
        return None

Problem solved!

👤rolling stone

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