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"""
Fixtures.
Fixtures are a way of loading data into the database in bulk. Fixure data
can be stored in any serializable format (including JSON and XML). Fixtures
are identified by name, and are stored in either a directory named 'fixtures'
in the application directory, or in one of the directories named in the
``FIXTURE_DIRS`` setting.
"""
import uuid
from django.contrib.auth.models import Permission
from django.contrib.contenttypes.fields import GenericForeignKey
from django.contrib.contenttypes.models import ContentType
from django.db import models
class Category(models.Model):
title = models.CharField(max_length=100)
description = models.TextField()
class Meta:
ordering = ("title",)
def __str__(self):
return self.title
class Article(models.Model):
headline = models.CharField(max_length=100, default="Default headline")
pub_date = models.DateTimeField()
class Meta:
ordering = ("-pub_date", "headline")
def __str__(self):
return self.headline
class Blog(models.Model):
name = models.CharField(max_length=100)
featured = models.ForeignKey(
Article, models.CASCADE, related_name="fixtures_featured_set"
)
articles = models.ManyToManyField(
Article, blank=True, related_name="fixtures_articles_set"
)
def __str__(self):
return self.name
class Tag(models.Model):
name = models.CharField(max_length=100)
tagged_type = models.ForeignKey(
ContentType, models.CASCADE, related_name="fixtures_tag_set"
)
tagged_id = models.PositiveIntegerField(default=0)
tagged = GenericForeignKey(ct_field="tagged_type", fk_field="tagged_id")
def __str__(self):
return '<%s: %s> tagged "%s"' % (
self.tagged.__class__.__name__,
self.tagged,
self.name,
)
class PersonManager(models.Manager):
def get_by_natural_key(self, name):
return self.get(name=name)
class Person(models.Model):
objects = PersonManager()
name = models.CharField(max_length=100, unique=True)
class Meta:
ordering = ("name",)
def __str__(self):
return self.name
def natural_key(self):
return (self.name,)
class SpyManager(PersonManager):
def get_queryset(self):
return super().get_queryset().filter(cover_blown=False)
class Spy(Person):
objects = SpyManager()
cover_blown = models.BooleanField(default=False)
class ProxySpy(Spy):
class Meta:
proxy = True
class VisaManager(models.Manager):
def get_queryset(self):
return super().get_queryset().prefetch_related("permissions")
class Visa(models.Model):
person = models.ForeignKey(Person, models.CASCADE)
permissions = models.ManyToManyField(Permission, blank=True)
objects = VisaManager()
def __str__(self):
return "%s %s" % (
self.person.name,
", ".join(p.name for p in self.permissions.all()),
)
class Book(models.Model):
name = models.CharField(max_length=100)
authors = models.ManyToManyField(Person)
class Meta:
ordering = ("name",)
def __str__(self):
authors = " and ".join(a.name for a in self.authors.all())
return "%s by %s" % (self.name, authors) if authors else self.name
class PrimaryKeyUUIDModel(models.Model):
id = models.UUIDField(primary_key=True, default=uuid.uuid4)
class NaturalKeyManager(models.Manager):
def get_by_natural_key(self, key):
return self.get(key=key)
class NaturalKeyThing(models.Model):
key = models.CharField(max_length=100, unique=True)
other_thing = models.ForeignKey(
"NaturalKeyThing", on_delete=models.CASCADE, null=True
)
other_things = models.ManyToManyField(
"NaturalKeyThing", related_name="thing_m2m_set"
)
objects = NaturalKeyManager()
def natural_key(self):
return (self.key,)
def __str__(self):
return self.key
class CircularA(models.Model):
key = models.CharField(max_length=3, unique=True)
obj = models.ForeignKey("CircularB", models.SET_NULL, null=True)
objects = NaturalKeyManager()
def natural_key(self):
return (self.key,)
class CircularB(models.Model):
key = models.CharField(max_length=3, unique=True)
obj = models.ForeignKey("CircularA", models.SET_NULL, null=True)
objects = NaturalKeyManager()
def natural_key(self):
return (self.key,)
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