Create Custom Error Messages with Model Forms

Question

I can see how to add an error message to a field when using forms, but what about model form?

This is my test model:

class Author(models.Model):
             


        

Answer 1

the easyest way is to override the clean method:

class AuthorForm(forms.ModelForm):
   class Meta:
      model = Author
   def clean(self):
      if self.cleaned_data.get('name')=="":
         raise forms.ValidationError('No name!')
      return self.cleaned_data