How can I handle validation errors in Django?

How can I handle validation errors in Django?

In Django, you can handle validation errors by using the clean() method in your forms or models. This method allows you to define custom validation logic.

Can you give me an example of using the clean() method?

Sure! In a form, you can override the clean() method like this:

class MyForm(forms.Form):
    name = forms.CharField(max_length=100)

    def clean_name(self):
        name = self.cleaned_data.get('name')
        if not name.isalpha():
            raise forms.ValidationError('Name must only contain letters.')
        return name

What happens if validation fails?

If validation fails, Django will raise a ValidationError, and the form will not be saved. Instead, the errors will be added to the form's errors attribute, which you can display in your template.