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

class TenantScopedQuerySet(models.QuerySet):
    def tenant(self, tenant=None):
        if tenant:
            return self.filter(tenant=tenant)
        return self

class TenantScopedManager(models.Manager):
    def get_queryset(self):
        return TenantScopedQuerySet(self.model, using=self._db)

    def tenant(self, tenant=None):
        return self.get_queryset().tenant(tenant)