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4f216e4f8e
Since #26291 forward references in natural keys are properly handled by loaddata, so sorting depenencies in dumpdata doesn't need to break on cycles. This patch allows circular references in natural keys by breaking sort_depenencies() on loops.
158 lines
4.2 KiB
Python
158 lines
4.2 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(Article, models.CASCADE, related_name='fixtures_featured_set')
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articles = models.ManyToManyField(Article, blank=True,
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related_name='fixtures_articles_set')
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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(ContentType, models.CASCADE, related_name="fixtures_tag_set")
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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"' % (self.tagged.__class__.__name__,
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self.tagged, self.name)
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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 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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def __str__(self):
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return '%s %s' % (self.person.name,
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', '.join(p.name for p in self.permissions.all()))
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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('NaturalKeyThing', on_delete=models.CASCADE, null=True)
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other_things = models.ManyToManyField('NaturalKeyThing', related_name='thing_m2m_set')
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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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