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from django.db import models
from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
from django.contrib.contenttypes.models import ContentType
class Relation(models.Model):
pass
class AbstractPerson(models.Model):
# DATA fields
data_abstract = models.CharField(max_length=10)
fk_abstract = models.ForeignKey(Relation, related_name='fk_abstract_rel')
# M2M fields
m2m_abstract = models.ManyToManyField(Relation, related_name='m2m_abstract_rel')
friends_abstract = models.ManyToManyField('self', related_name='friends_abstract', symmetrical=True)
following_abstract = models.ManyToManyField('self', related_name='followers_abstract', symmetrical=False)
# VIRTUAL fields
data_not_concrete_abstract = models.ForeignObject(
Relation,
from_fields=['abstract_non_concrete_id'],
to_fields=['id'],
related_name='fo_abstract_rel',
)
# GFK fields
content_type_abstract = models.ForeignKey(ContentType, 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
class BasePerson(AbstractPerson):
# DATA fields
data_base = models.CharField(max_length=10)
fk_base = models.ForeignKey(Relation, related_name='fk_base_rel')
# M2M fields
m2m_base = models.ManyToManyField(Relation, related_name='m2m_base_rel')
friends_base = models.ManyToManyField('self', related_name='friends_base', symmetrical=True)
following_base = models.ManyToManyField('self', related_name='followers_base', symmetrical=False)
# VIRTUAL fields
data_not_concrete_base = models.ForeignObject(
Relation,
from_fields=['base_non_concrete_id'],
to_fields=['id'],
related_name='fo_base_rel',
)
# GFK fields
content_type_base = models.ForeignKey(ContentType, 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, related_name='fk_concrete_rel')
# M2M Fields
m2m_inherited = models.ManyToManyField(Relation, related_name='m2m_concrete_rel')
friends_inherited = models.ManyToManyField('self', related_name='friends_concrete', symmetrical=True)
following_inherited = models.ManyToManyField('self', related_name='followers_concrete', symmetrical=False)
# VIRTUAL fields
data_not_concrete_inherited = models.ForeignObject(
Relation,
from_fields=['model_non_concrete_id'],
to_fields=['id'],
related_name='fo_concrete_rel',
)
# GFK fields
content_type_concrete = models.ForeignKey(ContentType, 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 ProxyPerson(Person):
class Meta:
proxy = True
class Relating(models.Model):
# ForeignKey to BasePerson
baseperson = models.ForeignKey(BasePerson, related_name='relating_baseperson')
baseperson_hidden = models.ForeignKey(BasePerson, related_name='+')
# ForeignKey to Person
person = models.ForeignKey(Person, related_name='relating_person')
person_hidden = models.ForeignKey(Person, related_name='+')
# ForeignKey to ProxyPerson
proxyperson = models.ForeignKey(ProxyPerson, related_name='relating_proxyperson')
proxyperson_hidden = models.ForeignKey(ProxyPerson, related_name='+')
# 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='+')
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