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