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from django.db.models.signals import class_prepared
def longer_username(sender, *args, **kwargs):
# You can't just do `if sender == django.contrib.auth.models.User`
# because you would have to import the model
# You have to test using __name__ and __module__
if sender.__name__ == "User" and sender.__module__ == "django.contrib.auth.models":
sender._meta.get_field("username").max_length = 75
class_prepared.connect(longer_username)
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