About Singleton Models

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from django.db import models
from django.core.exceptions import ValidationError

class SiteSettings(models.Model):
    # … fields for the settings …

    def full_clean(self, *args, **kwargs):
        if self._state.adding and SiteSettings.objects.exists():
            raise ValidationError(
                "There can only be one SiteSettings instance."
            )
        return super().full_clean(*args, **kwargs)

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