[Django]-Django unique random as a default value

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4👍

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Just test the existence of the generated code in the loop.

from django.contrib.auth.models import User

def unique_rand():
    while True:
        code = password = User.objects.make_random_password(length=8)
        if not Person.objects.filter(code=code).exists():
            return code

class Person(models.Model):
    code = models.CharField(max_length=8, unique=True, default=unique_rand)

Note that there is no round brackets in the default=unique_rand argument.

If you want to limit the number of attempts then change the loop from while to for:

def unique_rand():
    for _ in range(5):
        ...
    raise ValueError('Too many attempts to generate the code')
👤catavaran

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