Django override default form error messages

Question

How can I overwrite the default form error messages (for example: need them in other language) for the all apps in my project (or at least for 1 app)

Thanks!

Answer 1

Since this page comes up in a search, perhaps it's worth adding my $0.02 even though the question is old. (I'm still getting used to Stack Overflow's particular etiquette.)

The underscore ("_") is an alias (if that's the right term) for ugettext_lazy; just look at the import statements at the top of the file with "hard-coded" messages. Then, Django's internationalization docs should help, e.g. http://www.djangobook.com/en/2.0/chapter19/

Answer 2

You may want to look at Django's excellent i18n support.

Answer 3

from django import forms
from django.utils.translation import gettext as _


class MyForm(forms.Form):
     # create form field
     subject = forms.CharField(required=True)

     # override one specific error message and leave the others unchanged
     # use gettext for translation
     subject.error_messages['required'] = _('Please enter a subject below.')

Answer 4

To globally override the "required" error message, set the default_error_messages class attribute on Field:

# form error message override
from django.forms import Field
from django.utils.translation import ugettext_lazy
Field.default_error_messages = {
    'required': ugettext_lazy("This field is mandatory."),
}

This needs to happen before any fields are instantiated, e.g. by including it in settings.py.