from django.apps.registry import Apps

from django.db import models

class CustomModelBase(models.base.ModelBase):

    pass

class ModelWithCustomBase(models.Model, metaclass=CustomModelBase):

    pass

class UnicodeModel(models.Model):

    title = models.CharField("ÚÑÍ¢ÓÐÉ", max_length=20, default="“Ðjáñgó”")

    class Meta:

        # Disable auto loading of this model as we load it on our own

        apps = Apps()

        verbose_name = "úñí©óðé µóðéø"

        verbose_name_plural = "úñí©óðé µóðéøß"

    def __str__(self):

        return self.title

class Unserializable:

    """

    An object that migration doesn't know how to serialize.

    """

    pass

class UnserializableModel(models.Model):

    title = models.CharField(max_length=20, default=Unserializable())

    class Meta:

        # Disable auto loading of this model as we load it on our own

        apps = Apps()

class UnmigratedModel(models.Model):

    """

    A model that is in a migration-less app (which this app is

    if its migrations directory has not been repointed)

    """

    pass

class EmptyManager(models.Manager):

    use_in_migrations = True

class FoodQuerySet(models.query.QuerySet):

    pass

class BaseFoodManager(models.Manager):

    def __init__(self, a, b, c=1, d=2):

        super().__init__()

        self.args = (a, b, c, d)

class FoodManager(BaseFoodManager.from_queryset(FoodQuerySet)):

    use_in_migrations = True

class NoMigrationFoodManager(BaseFoodManager.from_queryset(FoodQuerySet)):

    pass