python - Django: How to override unique_together error message?

Question

In a model's Meta class, I define a unique_together. I have a ModelForm based on this model. When I call is_valid on this ModelForm, an error will automatically raised if unique_together validation fails. That's all good.

Now my problem is that I'm not satisfied with the default unique_together error message. I want to override it. How can I do that? For a field related error, I can easily do that by setting error_messages on the field parameters. But unique_together is a non field error. How can I override a non field error message?

Answer 1

You can do this since Django 1.7

from django.forms import ModelForm
from django.core.exceptions import NON_FIELD_ERRORS

class ArticleForm(ModelForm):
    class Meta:
        error_messages = {
            NON_FIELD_ERRORS: {
                'unique_together': "%(model_name)s's %(field_labels)s are not unique.",
            }
        }