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from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
from django.contrib.contenttypes.models import ContentType
from django.db import models
from django.utils.translation import gettext_lazy as _
class Relation(models.Model):
pass
class InstanceOnlyDescriptor:
def __get__(self, instance, cls=None):
if instance is None:
raise AttributeError("Instance only")
return 1
class AbstractPerson(models.Model):
# DATA fields
data_abstract = models.CharField(max_length=10)
fk_abstract = models.ForeignKey(
Relation, models.CASCADE, related_name="fk_abstract_rel"
)
# M2M fields
m2m_abstract = models.ManyToManyField(Relation, related_name="m2m_abstract_rel")
friends_abstract = models.ManyToManyField("self", symmetrical=True)
following_abstract = models.ManyToManyField(
"self", related_name="followers_abstract", symmetrical=False
)
# VIRTUAL fields
data_not_concrete_abstract = models.ForeignObject(
Relation,
on_delete=models.CASCADE,
from_fields=["abstract_non_concrete_id"],
to_fields=["id"],
related_name="fo_abstract_rel",
)
# GFK fields
content_type_abstract = models.ForeignKey(
ContentType, models.CASCADE, related_name="+"
)
object_id_abstract = models.PositiveIntegerField()
content_object_abstract = GenericForeignKey(
"content_type_abstract", "object_id_abstract"
)
# GR fields
generic_relation_abstract = GenericRelation(Relation)
class Meta:
abstract = True
@property
def test_property(self):
return 1
test_instance_only_descriptor = InstanceOnlyDescriptor()
class BasePerson(AbstractPerson):
# DATA fields
data_base = models.CharField(max_length=10)
fk_base = models.ForeignKey(Relation, models.CASCADE, related_name="fk_base_rel")
# M2M fields
m2m_base = models.ManyToManyField(Relation, related_name="m2m_base_rel")
friends_base = models.ManyToManyField("self", symmetrical=True)
following_base = models.ManyToManyField(
"self", related_name="followers_base", symmetrical=False
)
# VIRTUAL fields
data_not_concrete_base = models.ForeignObject(
Relation,
on_delete=models.CASCADE,
from_fields=["base_non_concrete_id"],
to_fields=["id"],
related_name="fo_base_rel",
)
# GFK fields
content_type_base = models.ForeignKey(ContentType, models.CASCADE, related_name="+")
object_id_base = models.PositiveIntegerField()
content_object_base = GenericForeignKey("content_type_base", "object_id_base")
# GR fields
generic_relation_base = GenericRelation(Relation)
class Person(BasePerson):
# DATA fields
data_inherited = models.CharField(max_length=10)
fk_inherited = models.ForeignKey(
Relation, models.CASCADE, related_name="fk_concrete_rel"
)
# M2M Fields
m2m_inherited = models.ManyToManyField(Relation, related_name="m2m_concrete_rel")
friends_inherited = models.ManyToManyField("self", symmetrical=True)
following_inherited = models.ManyToManyField(
"self", related_name="followers_concrete", symmetrical=False
)
# VIRTUAL fields
data_not_concrete_inherited = models.ForeignObject(
Relation,
on_delete=models.CASCADE,
from_fields=["model_non_concrete_id"],
to_fields=["id"],
related_name="fo_concrete_rel",
)
# GFK fields
content_type_concrete = models.ForeignKey(
ContentType, models.CASCADE, related_name="+"
)
object_id_concrete = models.PositiveIntegerField()
content_object_concrete = GenericForeignKey(
"content_type_concrete", "object_id_concrete"
)
# GR fields
generic_relation_concrete = GenericRelation(Relation)
class Meta:
verbose_name = _("Person")
class ProxyPerson(Person):
class Meta:
proxy = True
class PersonThroughProxySubclass(ProxyPerson):
pass
class Relating(models.Model):
# ForeignKey to BasePerson
baseperson = models.ForeignKey(
BasePerson, models.CASCADE, related_name="relating_baseperson"
)
baseperson_hidden = models.ForeignKey(BasePerson, models.CASCADE, related_name="+")
# ForeignKey to Person
person = models.ForeignKey(Person, models.CASCADE, related_name="relating_person")
person_hidden = models.ForeignKey(Person, models.CASCADE, related_name="+")
# ForeignKey to ProxyPerson
proxyperson = models.ForeignKey(
ProxyPerson, models.CASCADE, related_name="relating_proxyperson"
)
proxyperson_hidden = models.ForeignKey(
ProxyPerson, models.CASCADE, related_name="relating_proxyperson_hidden+"
)
# ManyToManyField to BasePerson
basepeople = models.ManyToManyField(BasePerson, related_name="relating_basepeople")
basepeople_hidden = models.ManyToManyField(BasePerson, related_name="+")
# ManyToManyField to Person
people = models.ManyToManyField(Person, related_name="relating_people")
people_hidden = models.ManyToManyField(Person, related_name="+")
class Swappable(models.Model):
class Meta:
swappable = "MODEL_META_TESTS_SWAPPED"
# ParentListTests models
class CommonAncestor(models.Model):
pass
class FirstParent(CommonAncestor):
first_ancestor = models.OneToOneField(
CommonAncestor, models.CASCADE, primary_key=True, parent_link=True
)
class SecondParent(CommonAncestor):
second_ancestor = models.OneToOneField(
CommonAncestor, models.CASCADE, primary_key=True, parent_link=True
)
class Child(FirstParent, SecondParent):
pass
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