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69597e5bcc
This is a rather large refactoring. The "lookup traversal" code was splitted out from the setup_joins. There is now names_to_path() method which does the lookup traveling, the actual work of setup_joins() is calling names_to_path() and then adding the joins found into the query. As a side effect it was possible to remove the "process_extra" functionality used by genric relations. This never worked for left joins. Now the extra restriction is appended directly to the join condition instead of the where clause. To generate the extra condition we need to have the join field available in the compiler. This has the side-effect that we need more ugly code in Query.__getstate__ and __setstate__ as Field objects aren't pickleable. The join trimming code got a big change - now we trim all direct joins and never trim reverse joins. This also fixes the problem in #10790 which was join trimming in null filter cases.
424 lines
11 KiB
Python
424 lines
11 KiB
Python
"""
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Various complex queries that have been problematic in the past.
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"""
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from __future__ import unicode_literals
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import threading
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from django.db import models
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from django.utils import six
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from django.utils.encoding import python_2_unicode_compatible
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class DumbCategory(models.Model):
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pass
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class ProxyCategory(DumbCategory):
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class Meta:
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proxy = True
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class NamedCategory(DumbCategory):
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name = models.CharField(max_length=10)
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@python_2_unicode_compatible
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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 __str__(self):
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return self.name
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@python_2_unicode_compatible
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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 __str__(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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@python_2_unicode_compatible
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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 __str__(self):
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return self.name
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@python_2_unicode_compatible
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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 __str__(self):
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return self.info
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@python_2_unicode_compatible
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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 __str__(self):
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return self.name
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@python_2_unicode_compatible
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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 __str__(self):
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return self.name
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@python_2_unicode_compatible
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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 __str__(self):
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return self.name
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@python_2_unicode_compatible
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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 __str__(self):
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return '%d: %s' % (self.rank, self.author.name)
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@python_2_unicode_compatible
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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 __str__(self):
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return self.title
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@python_2_unicode_compatible
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class Number(models.Model):
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num = models.IntegerField()
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def __str__(self):
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return six.text_type(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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@python_2_unicode_compatible
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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 __str__(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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@python_2_unicode_compatible
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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 __str__(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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@python_2_unicode_compatible
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class LeafA(models.Model):
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data = models.CharField(max_length=10)
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def __str__(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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@python_2_unicode_compatible
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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 __str__(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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@python_2_unicode_compatible
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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 __str__(self):
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return self.name
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class RelatedObject(models.Model):
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single = models.ForeignKey(SingleObject, null=True)
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f = models.IntegerField(null=True)
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class Meta:
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ordering = ['single']
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@python_2_unicode_compatible
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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 __str__(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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@python_2_unicode_compatible
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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 __str__(self):
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return self.name
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@python_2_unicode_compatible
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class Eaten(models.Model):
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food = models.ForeignKey(Food, to_field="name", null=True)
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meal = models.CharField(max_length=20)
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def __str__(self):
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return "%s at %s" % (self.food, self.meal)
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@python_2_unicode_compatible
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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 __str__(self):
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return "%s" % self.num
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# Bug #12252
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@python_2_unicode_compatible
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class ObjectA(models.Model):
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name = models.CharField(max_length=50)
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def __str__(self):
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return self.name
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@python_2_unicode_compatible
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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 __str__(self):
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return self.name
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@python_2_unicode_compatible
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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 __str__(self):
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return self.name
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@python_2_unicode_compatible
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class SimpleCategory(models.Model):
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name = models.CharField(max_length=15)
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def __str__(self):
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return self.name
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@python_2_unicode_compatible
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class SpecialCategory(SimpleCategory):
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special_name = models.CharField(max_length=15)
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def __str__(self):
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return self.name + " " + self.special_name
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@python_2_unicode_compatible
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class CategoryItem(models.Model):
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category = models.ForeignKey(SimpleCategory)
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def __str__(self):
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return "category item: " + str(self.category)
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@python_2_unicode_compatible
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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 __str__(self):
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return "one2one " + self.new_name
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class NullableName(models.Model):
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name = models.CharField(max_length=20, null=True)
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class Meta:
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ordering = ['id']
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class ModelD(models.Model):
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name = models.TextField()
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class ModelC(models.Model):
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name = models.TextField()
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class ModelB(models.Model):
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name = models.TextField()
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c = models.ForeignKey(ModelC)
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class ModelA(models.Model):
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name = models.TextField()
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b = models.ForeignKey(ModelB, null=True)
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d = models.ForeignKey(ModelD)
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@python_2_unicode_compatible
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class Job(models.Model):
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name = models.CharField(max_length=20, unique=True)
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def __str__(self):
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return self.name
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class JobResponsibilities(models.Model):
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job = models.ForeignKey(Job, to_field='name')
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responsibility = models.ForeignKey('Responsibility', to_field='description')
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@python_2_unicode_compatible
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class Responsibility(models.Model):
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description = models.CharField(max_length=20, unique=True)
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jobs = models.ManyToManyField(Job, through=JobResponsibilities,
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related_name='responsibilities')
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def __str__(self):
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return self.description
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