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287565779d
only consider some fields (PostgreSQL only). For this, the ``distinct()`` QuerySet method now accepts an optional list of model fields names and generates ``DISTINCT ON`` clauses on these cases. Thanks Jeffrey Gelens and Anssi Kääriäinen for their work. Fixes #6422. git-svn-id: http://code.djangoproject.com/svn/django/trunk@17244 bcc190cf-cafb-0310-a4f2-bffc1f526a37
349 lines
8.8 KiB
Python
349 lines
8.8 KiB
Python
"""
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Various complex queries that have been problematic in the past.
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"""
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import threading
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from django.db import models
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class DumbCategory(models.Model):
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pass
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class NamedCategory(DumbCategory):
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name = models.CharField(max_length=10)
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class Tag(models.Model):
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name = models.CharField(max_length=10)
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parent = models.ForeignKey('self', blank=True, null=True,
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related_name='children')
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category = models.ForeignKey(NamedCategory, null=True, default=None)
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class Meta:
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ordering = ['name']
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def __unicode__(self):
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return self.name
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class Note(models.Model):
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note = models.CharField(max_length=100)
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misc = models.CharField(max_length=10)
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class Meta:
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ordering = ['note']
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def __unicode__(self):
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return self.note
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def __init__(self, *args, **kwargs):
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super(Note, self).__init__(*args, **kwargs)
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# Regression for #13227 -- having an attribute that
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# is unpickleable doesn't stop you from cloning queries
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# that use objects of that type as an argument.
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self.lock = threading.Lock()
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class Annotation(models.Model):
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name = models.CharField(max_length=10)
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tag = models.ForeignKey(Tag)
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notes = models.ManyToManyField(Note)
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def __unicode__(self):
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return self.name
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class ExtraInfo(models.Model):
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info = models.CharField(max_length=100)
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note = models.ForeignKey(Note)
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class Meta:
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ordering = ['info']
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def __unicode__(self):
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return self.info
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class Author(models.Model):
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name = models.CharField(max_length=10)
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num = models.IntegerField(unique=True)
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extra = models.ForeignKey(ExtraInfo)
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class Meta:
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ordering = ['name']
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def __unicode__(self):
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return self.name
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class Item(models.Model):
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name = models.CharField(max_length=10)
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created = models.DateTimeField()
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modified = models.DateTimeField(blank=True, null=True)
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tags = models.ManyToManyField(Tag, blank=True, null=True)
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creator = models.ForeignKey(Author)
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note = models.ForeignKey(Note)
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class Meta:
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ordering = ['-note', 'name']
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def __unicode__(self):
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return self.name
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class Report(models.Model):
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name = models.CharField(max_length=10)
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creator = models.ForeignKey(Author, to_field='num', null=True)
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def __unicode__(self):
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return self.name
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class Ranking(models.Model):
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rank = models.IntegerField()
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author = models.ForeignKey(Author)
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class Meta:
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# A complex ordering specification. Should stress the system a bit.
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ordering = ('author__extra__note', 'author__name', 'rank')
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def __unicode__(self):
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return '%d: %s' % (self.rank, self.author.name)
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class Cover(models.Model):
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title = models.CharField(max_length=50)
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item = models.ForeignKey(Item)
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class Meta:
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ordering = ['item']
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def __unicode__(self):
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return self.title
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class Number(models.Model):
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num = models.IntegerField()
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def __unicode__(self):
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return unicode(self.num)
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# Symmetrical m2m field with a normal field using the reverse accesor name
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# ("valid").
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class Valid(models.Model):
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valid = models.CharField(max_length=10)
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parent = models.ManyToManyField('self')
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class Meta:
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ordering = ['valid']
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# Some funky cross-linked models for testing a couple of infinite recursion
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# cases.
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class X(models.Model):
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y = models.ForeignKey('Y')
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class Y(models.Model):
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x1 = models.ForeignKey(X, related_name='y1')
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# Some models with a cycle in the default ordering. This would be bad if we
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# didn't catch the infinite loop.
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class LoopX(models.Model):
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y = models.ForeignKey('LoopY')
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class Meta:
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ordering = ['y']
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class LoopY(models.Model):
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x = models.ForeignKey(LoopX)
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class Meta:
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ordering = ['x']
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class LoopZ(models.Model):
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z = models.ForeignKey('self')
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class Meta:
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ordering = ['z']
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# A model and custom default manager combination.
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class CustomManager(models.Manager):
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def get_query_set(self):
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qs = super(CustomManager, self).get_query_set()
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return qs.filter(public=True, tag__name='t1')
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class ManagedModel(models.Model):
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data = models.CharField(max_length=10)
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tag = models.ForeignKey(Tag)
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public = models.BooleanField(default=True)
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objects = CustomManager()
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normal_manager = models.Manager()
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def __unicode__(self):
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return self.data
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# An inter-related setup with multiple paths from Child to Detail.
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class Detail(models.Model):
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data = models.CharField(max_length=10)
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class MemberManager(models.Manager):
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def get_query_set(self):
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return super(MemberManager, self).get_query_set().select_related("details")
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class Member(models.Model):
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name = models.CharField(max_length=10)
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details = models.OneToOneField(Detail, primary_key=True)
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objects = MemberManager()
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class Child(models.Model):
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person = models.OneToOneField(Member, primary_key=True)
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parent = models.ForeignKey(Member, related_name="children")
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# Custom primary keys interfered with ordering in the past.
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class CustomPk(models.Model):
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name = models.CharField(max_length=10, primary_key=True)
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extra = models.CharField(max_length=10)
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class Meta:
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ordering = ['name', 'extra']
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class Related(models.Model):
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custom = models.ForeignKey(CustomPk)
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# An inter-related setup with a model subclass that has a nullable
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# path to another model, and a return path from that model.
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class Celebrity(models.Model):
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name = models.CharField("Name", max_length=20)
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greatest_fan = models.ForeignKey("Fan", null=True, unique=True)
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def __unicode__(self):
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return self.name
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class TvChef(Celebrity):
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pass
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class Fan(models.Model):
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fan_of = models.ForeignKey(Celebrity)
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# Multiple foreign keys
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class LeafA(models.Model):
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data = models.CharField(max_length=10)
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def __unicode__(self):
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return self.data
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class LeafB(models.Model):
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data = models.CharField(max_length=10)
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class Join(models.Model):
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a = models.ForeignKey(LeafA)
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b = models.ForeignKey(LeafB)
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class ReservedName(models.Model):
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name = models.CharField(max_length=20)
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order = models.IntegerField()
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def __unicode__(self):
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return self.name
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# A simpler shared-foreign-key setup that can expose some problems.
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class SharedConnection(models.Model):
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data = models.CharField(max_length=10)
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class PointerA(models.Model):
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connection = models.ForeignKey(SharedConnection)
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class PointerB(models.Model):
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connection = models.ForeignKey(SharedConnection)
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# Multi-layer ordering
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class SingleObject(models.Model):
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name = models.CharField(max_length=10)
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class Meta:
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ordering = ['name']
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def __unicode__(self):
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return self.name
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class RelatedObject(models.Model):
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single = models.ForeignKey(SingleObject)
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class Meta:
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ordering = ['single']
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class Plaything(models.Model):
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name = models.CharField(max_length=10)
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others = models.ForeignKey(RelatedObject, null=True)
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class Meta:
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ordering = ['others']
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def __unicode__(self):
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return self.name
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class Article(models.Model):
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name = models.CharField(max_length=20)
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created = models.DateTimeField()
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class Food(models.Model):
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name = models.CharField(max_length=20, unique=True)
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def __unicode__(self):
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return self.name
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class Eaten(models.Model):
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food = models.ForeignKey(Food, to_field="name")
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meal = models.CharField(max_length=20)
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def __unicode__(self):
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return u"%s at %s" % (self.food, self.meal)
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class Node(models.Model):
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num = models.IntegerField(unique=True)
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parent = models.ForeignKey("self", to_field="num", null=True)
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def __unicode__(self):
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return u"%s" % self.num
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# Bug #12252
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class ObjectA(models.Model):
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name = models.CharField(max_length=50)
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def __unicode__(self):
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return self.name
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class ObjectB(models.Model):
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name = models.CharField(max_length=50)
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objecta = models.ForeignKey(ObjectA)
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num = models.PositiveSmallIntegerField()
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def __unicode__(self):
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return self.name
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class ObjectC(models.Model):
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name = models.CharField(max_length=50)
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objecta = models.ForeignKey(ObjectA)
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objectb = models.ForeignKey(ObjectB)
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def __unicode__(self):
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return self.name
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class SimpleCategory(models.Model):
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name = models.CharField(max_length=15)
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def __unicode__(self):
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return self.name
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class SpecialCategory(SimpleCategory):
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special_name = models.CharField(max_length=15)
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def __unicode__(self):
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return self.name + " " + self.special_name
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class CategoryItem(models.Model):
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category = models.ForeignKey(SimpleCategory)
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def __unicode__(self):
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return "category item: " + str(self.category)
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class OneToOneCategory(models.Model):
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new_name = models.CharField(max_length=15)
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category = models.OneToOneField(SimpleCategory)
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def __unicode__(self):
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return "one2one " + self.new_name
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