How does the clean method work in Django model forms?

How does the clean method work in Django model forms?

The clean method in Django model forms is used to validate and clean data before saving it to the database. You can override it to add custom validation logic.

Can you give me an example of how to override the clean method?

Sure! You can override it like this:

class MyForm(forms.ModelForm):
    def clean(self):
        cleaned_data = super().clean()
        # Add custom validation here
        return cleaned_data

What if I want to validate a specific field?

You can override the clean_<fieldname> method for that specific field. For example:

class MyForm(forms.ModelForm):
    def clean_email(self):
        email = self.cleaned_data.get('email')
        if not email.endswith('@example.com'):
            raise forms.ValidationError('Email must be from example.com')
        return email

Is it possible to raise multiple validation errors?

Yes, you can collect errors in a list and raise them all at once using ValidationError. Just ensure to call self.add_error(field, error) for each error.