Python django.db.models.CASCADE() Examples

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def set_up_test_model(self):
        operations = [
            migrations.CreateModel(
                "Pony",
                [
                    ('pony_id', models.AutoField(primary_key=True)),
                    ('pink', models.IntegerField(default=3)),
                    ('weight', models.FloatField())
                ],
            ),
            migrations.CreateModel(
                'Rider',
                [
                    ('rider_id', models.AutoField(primary_key=True)),
                    ('pony', models.ForeignKey('Pony', on_delete=models.CASCADE))
                ],
            ),
        ]
        return self.apply_operations('tests', ProjectState(), operations) 

def save_user_profile(sender, instance, **kwargs):
    instance.profile.save()


# class ParsedProfile(models.Model):
#     user = models.OneToOneField(User, on_delete=models.CASCADE)
#     name = models.CharField(max_length=250)
#     header = models.CharField(max_length=500, null=True)
#     url = models.CharField(max_length=500)
#     school = models.CharField(max_length=500, null=True)
#     school_program = models.CharField(max_length=500, null=True)
#
#
# class JobTitle(models.Model):
#     profile = models.ForeignKey(ParsedProfile, on_delete=models.CASCADE)
#     job = models.CharField(max_length=500, null=True)
#
#
# class Location(models.Model):
#     profile = models.ForeignKey(ParsedProfile, on_delete=models.CASCADE)
#     loc = models.CharField(max_length=500, default=None)


# Below is All The Profiles that were originally in DB and added new ones by User
# Initial Profiles, only 2000 were in DB (mainly SE/CS focused) 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
            for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
            for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
            for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
            for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
            for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
            for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
            for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
                 for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
            for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, object_id_field='object_id', content_type_field='content_type',
            for_concrete_model=True, related_query_name=None, limit_choices_to=None, **kwargs):
        kwargs['rel'] = self.rel_class(
            self, to,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
        )

        kwargs['blank'] = True
        kwargs['on_delete'] = models.CASCADE
        kwargs['editable'] = False
        kwargs['serialize'] = False

        # This construct is somewhat of an abuse of ForeignObject. This field
        # represents a relation from pk to object_id field. But, this relation
        # isn't direct, the join is generated reverse along foreign key. So,
        # the from_field is object_id field, to_field is pk because of the
        # reverse join.
        super(GenericRelation, self).__init__(
            to, from_fields=[object_id_field], to_fields=[], **kwargs)

        self.object_id_field_name = object_id_field
        self.content_type_field_name = content_type_field
        self.for_concrete_model = for_concrete_model 

def __init__(self, to, on_delete=None, to_field=None, **kwargs):
        kwargs['unique'] = True

        if on_delete is None:
            warnings.warn(
                "on_delete will be a required arg for %s in Django 2.0. Set "
                "it to models.CASCADE on models and in existing migrations "
                "if you want to maintain the current default behavior. "
                "See https://docs.djangoproject.com/en/%s/ref/models/fields/"
                "#django.db.models.ForeignKey.on_delete" % (
                    self.__class__.__name__,
                    get_docs_version(),
                ),
                RemovedInDjango20Warning, 2)
            on_delete = CASCADE

        elif not callable(on_delete):
            warnings.warn(
                "The signature for {0} will change in Django 2.0. "
                "Pass to_field='{1}' as a kwarg instead of as an arg.".format(
                    self.__class__.__name__,
                    on_delete,
                ),
                RemovedInDjango20Warning, 2)
            to_field = on_delete
            on_delete = CASCADE  # Avoid warning in superclass

        super(OneToOneField, self).__init__(to, on_delete, to_field=to_field, **kwargs) 

def createBaseAttr(model):
    class GeneratedAttr(AbstractBaseAttr):
        """
        An abstract Base Class used to generate actual Attr classes
        with an object
        """
        object = models.ForeignKey(model, related_name='attrs', on_delete=models.CASCADE)

        _model = model

        class Meta:
            abstract = True
            unique_together = (('attribute', 'object'), )

    return GeneratedAttr 

def __str__(self):
        return self.disability_name
    # student = models.ForeignKey(StudentInfo, on_delete=models.CASCADE) 

def __str__(self):
        return self.disability_name
    # student = models.ForeignKey(StudentInfo, on_delete=models.CASCADE) 

def test_invalid_base_fields(self):
        class Related(models.Model):
            field = encrypt(
                models.ForeignKey('fields.EncryptedIntegerModel',
                                  models.CASCADE))

            class Meta:
                app_label = 'myapp'

        obj = Related()
        errors = obj.check()
        self.assertEqual(1, len(errors))
        self.assertEqual('encrypted.E002', errors[0].id) 

def __init__(self, model, on_delete=models.CASCADE, **kwargs):
        self._make_key = lambda name: models.ForeignKey(model, related_query_name=name.lower(), on_delete=on_delete, **kwargs) 

def __init__(self, to, on_delete=None, to_field=None, **kwargs):
        kwargs['unique'] = True

        if on_delete is None:
            warnings.warn(
                "on_delete will be a required arg for %s in Django 2.0. Set "
                "it to models.CASCADE on models and in existing migrations "
                "if you want to maintain the current default behavior. "
                "See https://docs.djangoproject.com/en/%s/ref/models/fields/"
                "#django.db.models.ForeignKey.on_delete" % (
                    self.__class__.__name__,
                    get_docs_version(),
                ),
                RemovedInDjango20Warning, 2)
            on_delete = CASCADE

        elif not callable(on_delete):
            warnings.warn(
                "The signature for {0} will change in Django 2.0. "
                "Pass to_field='{1}' as a kwarg instead of as an arg.".format(
                    self.__class__.__name__,
                    on_delete,
                ),
                RemovedInDjango20Warning, 2)
            to_field = on_delete
            on_delete = CASCADE  # Avoid warning in superclass

        super(OneToOneField, self).__init__(to, on_delete, to_field=to_field, **kwargs) 

def test_content_type(self):
        field = ServeLog._meta.get_field('content_type')
        self.assertModelPKField(field, ContentType, models.CASCADE, False, False) 

def test_menu(self):
        field = MenuMenuItem._meta.get_field('menu')
        self.assertModelParentalKeyField(field, Menu, models.CASCADE, False, False, 'menu_items') 

def test_page(self):
        field = BasicPageCarouselItem._meta.get_field('page')
        self.assertModelParentalKeyField(field, BasicPage, models.CASCADE, False, False) 

def test_page(self):
        field = BasicPageSectionItem._meta.get_field('page')
        self.assertModelParentalKeyField(field, BasicPage, models.CASCADE, False, False) 

def __str__(self):
		return self.name                                                   

#class currentOwner(models.Model):
	#current ownership (user foreign key)
#	currOwn      = models.ForeignKey(Customer, on_delete=models.CASCADE) #current ownership (user foreign key
#	def __str__(self):
#		return self.currOwn
	#ADD HISTORY PART 

def __init__(self, to, on_delete=None, to_field=None, **kwargs):
        kwargs['unique'] = True

        if on_delete is None:
            warnings.warn(
                "on_delete will be a required arg for %s in Django 2.0. Set "
                "it to models.CASCADE on models and in existing migrations "
                "if you want to maintain the current default behavior. "
                "See https://docs.djangoproject.com/en/%s/ref/models/fields/"
                "#django.db.models.ForeignKey.on_delete" % (
                    self.__class__.__name__,
                    get_docs_version(),
                ),
                RemovedInDjango20Warning, 2)
            on_delete = CASCADE

        elif not callable(on_delete):
            warnings.warn(
                "The signature for {0} will change in Django 2.0. "
                "Pass to_field='{1}' as a kwarg instead of as an arg.".format(
                    self.__class__.__name__,
                    on_delete,
                ),
                RemovedInDjango20Warning, 2)
            to_field = on_delete
            on_delete = CASCADE  # Avoid warning in superclass

        super(OneToOneField, self).__init__(to, on_delete, to_field=to_field, **kwargs) 

def __init__(self, to, on_delete=None, to_field=None, **kwargs):
        kwargs['unique'] = True

        if on_delete is None:
            warnings.warn(
                "on_delete will be a required arg for %s in Django 2.0. Set "
                "it to models.CASCADE on models and in existing migrations "
                "if you want to maintain the current default behavior. "
                "See https://docs.djangoproject.com/en/%s/ref/models/fields/"
                "#django.db.models.ForeignKey.on_delete" % (
                    self.__class__.__name__,
                    get_docs_version(),
                ),
                RemovedInDjango20Warning, 2)
            on_delete = CASCADE

        elif not callable(on_delete):
            warnings.warn(
                "The signature for {0} will change in Django 2.0. "
                "Pass to_field='{1}' as a kwarg instead of as an arg.".format(
                    self.__class__.__name__,
                    on_delete,
                ),
                RemovedInDjango20Warning, 2)
            to_field = on_delete
            on_delete = CASCADE  # Avoid warning in superclass

        super(OneToOneField, self).__init__(to, on_delete, to_field=to_field, **kwargs) 

def __str__(self):
        return 'Email: ' + self.user.email 

# class UserSettings(models.Model):
#     user = models.OneToOneField(UserProfile,on_delete=models.CASCADE,primary_key=True) 

def tearDown(self):
        with connection.cursor() as cursor:
            for schema in Schema.objects.all():
                cursor.execute('DROP SCHEMA IF EXISTS {0} CASCADE'.format(schema.schema))

            cursor.execute('SET search_path TO __template__,public')
            cursor.execute('DROP TABLE IF EXISTS tests_rider')
            cursor.execute("DROP TABLE IF EXISTS tests_pony") 

def __init__(self, to, on_delete=None, to_field=None, **kwargs):
        kwargs['unique'] = True

        if on_delete is None:
            warnings.warn(
                "on_delete will be a required arg for %s in Django 2.0. Set "
                "it to models.CASCADE on models and in existing migrations "
                "if you want to maintain the current default behavior. "
                "See https://docs.djangoproject.com/en/%s/ref/models/fields/"
                "#django.db.models.ForeignKey.on_delete" % (
                    self.__class__.__name__,
                    get_docs_version(),
                ),
                RemovedInDjango20Warning, 2)
            on_delete = CASCADE

        elif not callable(on_delete):
            warnings.warn(
                "The signature for {0} will change in Django 2.0. "
                "Pass to_field='{1}' as a kwarg instead of as an arg.".format(
                    self.__class__.__name__,
                    on_delete,
                ),
                RemovedInDjango20Warning, 2)
            to_field = on_delete
            on_delete = CASCADE  # Avoid warning in superclass

        super(OneToOneField, self).__init__(to, on_delete, to_field=to_field, **kwargs) 

def __init__(self, to, on_delete=None, to_field=None, **kwargs):
        kwargs['unique'] = True

        if on_delete is None:
            warnings.warn(
                "on_delete will be a required arg for %s in Django 2.0. Set "
                "it to models.CASCADE on models and in existing migrations "
                "if you want to maintain the current default behavior. "
                "See https://docs.djangoproject.com/en/%s/ref/models/fields/"
                "#django.db.models.ForeignKey.on_delete" % (
                    self.__class__.__name__,
                    get_docs_version(),
                ),
                RemovedInDjango20Warning, 2)
            on_delete = CASCADE

        elif not callable(on_delete):
            warnings.warn(
                "The signature for {0} will change in Django 2.0. "
                "Pass to_field='{1}' as a kwarg instead of as an arg.".format(
                    self.__class__.__name__,
                    on_delete,
                ),
                RemovedInDjango20Warning, 2)
            to_field = on_delete
            on_delete = CASCADE  # Avoid warning in superclass

        super(OneToOneField, self).__init__(to, on_delete, to_field=to_field, **kwargs) 

def __init__(self, to, on_delete=None, related_name=None, related_query_name=None,
            limit_choices_to=None, parent_link=False, to_field=None,
            db_constraint=True, **kwargs):
        try:
            to._meta.model_name
        except AttributeError:
            assert isinstance(to, six.string_types), (
                "%s(%r) is invalid. First parameter to ForeignKey must be "
                "either a model, a model name, or the string %r" % (
                    self.__class__.__name__, to,
                    RECURSIVE_RELATIONSHIP_CONSTANT,
                )
            )
        else:
            # For backwards compatibility purposes, we need to *try* and set
            # the to_field during FK construction. It won't be guaranteed to
            # be correct until contribute_to_class is called. Refs #12190.
            to_field = to_field or (to._meta.pk and to._meta.pk.name)

        if on_delete is None:
            warnings.warn(
                "on_delete will be a required arg for %s in Django 2.0. Set "
                "it to models.CASCADE on models and in existing migrations "
                "if you want to maintain the current default behavior. "
                "See https://docs.djangoproject.com/en/%s/ref/models/fields/"
                "#django.db.models.ForeignKey.on_delete" % (
                    self.__class__.__name__,
                    get_docs_version(),
                ),
                RemovedInDjango20Warning, 2)
            on_delete = CASCADE

        elif not callable(on_delete):
            warnings.warn(
                "The signature for {0} will change in Django 2.0. "
                "Pass to_field='{1}' as a kwarg instead of as an arg.".format(
                    self.__class__.__name__,
                    on_delete,
                ),
                RemovedInDjango20Warning, 2)
            on_delete, to_field = to_field, on_delete

        kwargs['rel'] = self.rel_class(
            self, to, to_field,
            related_name=related_name,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
            parent_link=parent_link,
            on_delete=on_delete,
        )

        kwargs['db_index'] = kwargs.get('db_index', True)

        super(ForeignKey, self).__init__(
            to, on_delete, from_fields=['self'], to_fields=[to_field], **kwargs)

        self.db_constraint = db_constraint 

def create_many_to_many_intermediary_model(field, klass):
    from django.db import models

    def set_managed(model, related, through):
        through._meta.managed = model._meta.managed or related._meta.managed

    to_model = resolve_relation(klass, field.remote_field.model)
    name = '%s_%s' % (klass._meta.object_name, field.name)
    lazy_related_operation(set_managed, klass, to_model, name)

    to = make_model_tuple(to_model)[1]
    from_ = klass._meta.model_name
    if to == from_:
        to = 'to_%s' % to
        from_ = 'from_%s' % from_

    meta = type(str('Meta'), (object,), {
        'db_table': field._get_m2m_db_table(klass._meta),
        'auto_created': klass,
        'app_label': klass._meta.app_label,
        'db_tablespace': klass._meta.db_tablespace,
        'unique_together': (from_, to),
        'verbose_name': '%(from)s-%(to)s relationship' % {'from': from_, 'to': to},
        'verbose_name_plural': '%(from)s-%(to)s relationships' % {'from': from_, 'to': to},
        'apps': field.model._meta.apps,
    })
    # Construct and return the new class.
    return type(str(name), (models.Model,), {
        'Meta': meta,
        '__module__': klass.__module__,
        from_: models.ForeignKey(
            klass,
            related_name='%s+' % name,
            db_tablespace=field.db_tablespace,
            db_constraint=field.remote_field.db_constraint,
            on_delete=CASCADE,
        ),
        to: models.ForeignKey(
            to_model,
            related_name='%s+' % name,
            db_tablespace=field.db_tablespace,
            db_constraint=field.remote_field.db_constraint,
            on_delete=CASCADE,
        )
    }) 

def deactivate(self):
        """Deactivate a subscriber.

        Send an async post to the BTS to deactivate the subscriber.  Sign the
        request using JWT.  Note that we do not also send deactivate number
        commands -- the BTS will handle that on its own.  If the sub does not
        have an associated BTS, the sub's previous tower may have been deleted.
        We can still delete the sub we just do not have to notify a tower.
        """
        if self.bts:
            url = '%s/config/deactivate_subscriber' % self.bts.inbound_url
            data = {
                'imsi': self.imsi,
                # Add a UUID as a nonce for the message.
                'msgid': str(uuid.uuid4()),
            }
            serializer = itsdangerous.JSONWebSignatureSerializer(
                self.bts.secret)
            signed_data = {
                'jwt': serializer.dumps(data),
            }
            # Retry the async_post for three months until it succeeds.
            retry_delay = 60 * 10
            three_months = 3 * 30 * 24 * 60 * 60.
            max_retries = int(three_months / retry_delay)
            celery_app.send_task(
                'endagaweb.tasks.async_post', (url, signed_data),
                max_retries=max_retries)
        # Deactivate all associated Numbers from this Sub.
        numbers = Number.objects.filter(subscriber=self)
        with transaction.atomic():
            now = django.utils.timezone.now()
            # Create a 'delete_imsi' UsageEvent.
            bts_uuid = None
            if self.bts:
                bts_uuid = self.bts.uuid
            event = UsageEvent.objects.create(
                subscriber=self, date=now, bts=self.bts, kind='delete_imsi',
                subscriber_imsi=self.imsi, bts_uuid=bts_uuid,
                oldamt=self.balance, newamt=self.balance, change=0,
                reason='deactivated subscriber: %s' % self.imsi)
            event.save()
            for number in numbers:
                reason = 'deactivated phone number: %s' % number.number
                event = UsageEvent.objects.create(
                    subscriber=self, date=now, bts=self.bts,
                    kind='deactivate_number', to_number=number.number,
                    reason=reason, oldamt=self.balance, newamt=self.balance,
                    change=0)
                event.save()
                number.network = None
                number.subscriber = None
                number.state = 'available'
                number.save()
            # Actually delete the subscriber.  Note that all associated
            # PendingCreditUpdates will be deleted automatically by the default
            # deletion CASCADE behavior.
            self.delete() 

def __init__(self, to, on_delete=None, related_name=None, related_query_name=None,
                 limit_choices_to=None, parent_link=False, to_field=None,
                 db_constraint=True, **kwargs):
        try:
            to._meta.model_name
        except AttributeError:
            assert isinstance(to, six.string_types), (
                "%s(%r) is invalid. First parameter to ForeignKey must be "
                "either a model, a model name, or the string %r" % (
                    self.__class__.__name__, to,
                    RECURSIVE_RELATIONSHIP_CONSTANT,
                )
            )
        else:
            # For backwards compatibility purposes, we need to *try* and set
            # the to_field during FK construction. It won't be guaranteed to
            # be correct until contribute_to_class is called. Refs #12190.
            to_field = to_field or (to._meta.pk and to._meta.pk.name)

        if on_delete is None:
            warnings.warn(
                "on_delete will be a required arg for %s in Django 2.0. Set "
                "it to models.CASCADE on models and in existing migrations "
                "if you want to maintain the current default behavior. "
                "See https://docs.djangoproject.com/en/%s/ref/models/fields/"
                "#django.db.models.ForeignKey.on_delete" % (
                    self.__class__.__name__,
                    get_docs_version(),
                ),
                RemovedInDjango20Warning, 2)
            on_delete = CASCADE

        elif not callable(on_delete):
            warnings.warn(
                "The signature for {0} will change in Django 2.0. "
                "Pass to_field='{1}' as a kwarg instead of as an arg.".format(
                    self.__class__.__name__,
                    on_delete,
                ),
                RemovedInDjango20Warning, 2)
            on_delete, to_field = to_field, on_delete

        kwargs['rel'] = self.rel_class(
            self, to, to_field,
            related_name=related_name,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
            parent_link=parent_link,
            on_delete=on_delete,
        )

        kwargs['db_index'] = kwargs.get('db_index', True)

        super(ForeignKey, self).__init__(
            to, on_delete, from_fields=['self'], to_fields=[to_field], **kwargs)

        self.db_constraint = db_constraint 

def create_many_to_many_intermediary_model(field, klass):
    from django.db import models

    def set_managed(model, related, through):
        through._meta.managed = model._meta.managed or related._meta.managed

    to_model = resolve_relation(klass, field.remote_field.model)
    name = '%s_%s' % (klass._meta.object_name, field.name)
    lazy_related_operation(set_managed, klass, to_model, name)

    to = make_model_tuple(to_model)[1]
    from_ = klass._meta.model_name
    if to == from_:
        to = 'to_%s' % to
        from_ = 'from_%s' % from_

    meta = type(str('Meta'), (object,), {
        'db_table': field._get_m2m_db_table(klass._meta),
        'auto_created': klass,
        'app_label': klass._meta.app_label,
        'db_tablespace': klass._meta.db_tablespace,
        'unique_together': (from_, to),
        'verbose_name': _('%(from)s-%(to)s relationship') % {'from': from_, 'to': to},
        'verbose_name_plural': _('%(from)s-%(to)s relationships') % {'from': from_, 'to': to},
        'apps': field.model._meta.apps,
    })
    # Construct and return the new class.
    return type(str(name), (models.Model,), {
        'Meta': meta,
        '__module__': klass.__module__,
        from_: models.ForeignKey(
            klass,
            related_name='%s+' % name,
            db_tablespace=field.db_tablespace,
            db_constraint=field.remote_field.db_constraint,
            on_delete=CASCADE,
        ),
        to: models.ForeignKey(
            to_model,
            related_name='%s+' % name,
            db_tablespace=field.db_tablespace,
            db_constraint=field.remote_field.db_constraint,
            on_delete=CASCADE,
        )
    }) 

def __init__(self, to, on_delete=None, related_name=None, related_query_name=None,
                 limit_choices_to=None, parent_link=False, to_field=None,
                 db_constraint=True, **kwargs):
        try:
            to._meta.model_name
        except AttributeError:
            assert isinstance(to, six.string_types), (
                "%s(%r) is invalid. First parameter to ForeignKey must be "
                "either a model, a model name, or the string %r" % (
                    self.__class__.__name__, to,
                    RECURSIVE_RELATIONSHIP_CONSTANT,
                )
            )
        else:
            # For backwards compatibility purposes, we need to *try* and set
            # the to_field during FK construction. It won't be guaranteed to
            # be correct until contribute_to_class is called. Refs #12190.
            to_field = to_field or (to._meta.pk and to._meta.pk.name)

        if on_delete is None:
            warnings.warn(
                "on_delete will be a required arg for %s in Django 2.0. Set "
                "it to models.CASCADE on models and in existing migrations "
                "if you want to maintain the current default behavior. "
                "See https://docs.djangoproject.com/en/%s/ref/models/fields/"
                "#django.db.models.ForeignKey.on_delete" % (
                    self.__class__.__name__,
                    get_docs_version(),
                ),
                RemovedInDjango20Warning, 2)
            on_delete = CASCADE

        elif not callable(on_delete):
            warnings.warn(
                "The signature for {0} will change in Django 2.0. "
                "Pass to_field='{1}' as a kwarg instead of as an arg.".format(
                    self.__class__.__name__,
                    on_delete,
                ),
                RemovedInDjango20Warning, 2)
            on_delete, to_field = to_field, on_delete

        kwargs['rel'] = self.rel_class(
            self, to, to_field,
            related_name=related_name,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
            parent_link=parent_link,
            on_delete=on_delete,
        )

        kwargs['db_index'] = kwargs.get('db_index', True)

        super(ForeignKey, self).__init__(
            to, on_delete, from_fields=['self'], to_fields=[to_field], **kwargs)

        self.db_constraint = db_constraint 

def create_many_to_many_intermediary_model(field, klass):
    from django.db import models

    def set_managed(model, related, through):
        through._meta.managed = model._meta.managed or related._meta.managed

    to_model = resolve_relation(klass, field.remote_field.model)
    name = '%s_%s' % (klass._meta.object_name, field.name)
    lazy_related_operation(set_managed, klass, to_model, name)

    to = make_model_tuple(to_model)[1]
    from_ = klass._meta.model_name
    if to == from_:
        to = 'to_%s' % to
        from_ = 'from_%s' % from_

    meta = type(str('Meta'), (object,), {
        'db_table': field._get_m2m_db_table(klass._meta),
        'auto_created': klass,
        'app_label': klass._meta.app_label,
        'db_tablespace': klass._meta.db_tablespace,
        'unique_together': (from_, to),
        'verbose_name': _('%(from)s-%(to)s relationship') % {'from': from_, 'to': to},
        'verbose_name_plural': _('%(from)s-%(to)s relationships') % {'from': from_, 'to': to},
        'apps': field.model._meta.apps,
    })
    # Construct and return the new class.
    return type(str(name), (models.Model,), {
        'Meta': meta,
        '__module__': klass.__module__,
        from_: models.ForeignKey(
            klass,
            related_name='%s+' % name,
            db_tablespace=field.db_tablespace,
            db_constraint=field.remote_field.db_constraint,
            on_delete=CASCADE,
        ),
        to: models.ForeignKey(
            to_model,
            related_name='%s+' % name,
            db_tablespace=field.db_tablespace,
            db_constraint=field.remote_field.db_constraint,
            on_delete=CASCADE,
        )
    }) 

def __init__(self, to, on_delete=None, related_name=None, related_query_name=None,
            limit_choices_to=None, parent_link=False, to_field=None,
            db_constraint=True, **kwargs):
        try:
            to._meta.model_name
        except AttributeError:
            assert isinstance(to, six.string_types), (
                "%s(%r) is invalid. First parameter to ForeignKey must be "
                "either a model, a model name, or the string %r" % (
                    self.__class__.__name__, to,
                    RECURSIVE_RELATIONSHIP_CONSTANT,
                )
            )
        else:
            # For backwards compatibility purposes, we need to *try* and set
            # the to_field during FK construction. It won't be guaranteed to
            # be correct until contribute_to_class is called. Refs #12190.
            to_field = to_field or (to._meta.pk and to._meta.pk.name)

        if on_delete is None:
            warnings.warn(
                "on_delete will be a required arg for %s in Django 2.0. Set "
                "it to models.CASCADE on models and in existing migrations "
                "if you want to maintain the current default behavior. "
                "See https://docs.djangoproject.com/en/%s/ref/models/fields/"
                "#django.db.models.ForeignKey.on_delete" % (
                    self.__class__.__name__,
                    get_docs_version(),
                ),
                RemovedInDjango20Warning, 2)
            on_delete = CASCADE

        elif not callable(on_delete):
            warnings.warn(
                "The signature for {0} will change in Django 2.0. "
                "Pass to_field='{1}' as a kwarg instead of as an arg.".format(
                    self.__class__.__name__,
                    on_delete,
                ),
                RemovedInDjango20Warning, 2)
            on_delete, to_field = to_field, on_delete

        kwargs['rel'] = self.rel_class(
            self, to, to_field,
            related_name=related_name,
            related_query_name=related_query_name,
            limit_choices_to=limit_choices_to,
            parent_link=parent_link,
            on_delete=on_delete,
        )

        kwargs['db_index'] = kwargs.get('db_index', True)

        super(ForeignKey, self).__init__(
            to, on_delete, from_fields=['self'], to_fields=[to_field], **kwargs)

        self.db_constraint = db_constraint