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f31425e8e2
Also added documentation describing how manager inheritance works (and when manager aren't inherited). Based on some patches from sebastian_noack and emulbreh. git-svn-id: http://code.djangoproject.com/svn/django/trunk@8851 bcc190cf-cafb-0310-a4f2-bffc1f526a37
154 lines
4.0 KiB
Python
154 lines
4.0 KiB
Python
"""
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Various edge-cases for model managers.
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"""
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from django.db import models
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class OnlyFred(models.Manager):
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def get_query_set(self):
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return super(OnlyFred, self).get_query_set().filter(name='fred')
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class OnlyBarney(models.Manager):
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def get_query_set(self):
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return super(OnlyBarney, self).get_query_set().filter(name='barney')
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class Value42(models.Manager):
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def get_query_set(self):
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return super(Value42, self).get_query_set().filter(value=42)
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class AbstractBase1(models.Model):
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name = models.CharField(max_length=50)
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class Meta:
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abstract = True
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# Custom managers
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manager1 = OnlyFred()
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manager2 = OnlyBarney()
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objects = models.Manager()
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class AbstractBase2(models.Model):
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value = models.IntegerField()
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class Meta:
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abstract = True
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# Custom manager
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restricted = Value42()
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# No custom manager on this class to make sure the default case doesn't break.
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class AbstractBase3(models.Model):
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comment = models.CharField(max_length=50)
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class Meta:
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abstract = True
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class Parent(models.Model):
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name = models.CharField(max_length=50)
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manager = OnlyFred()
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def __unicode__(self):
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return self.name
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# Managers from base classes are inherited and, if no manager is specified
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# *and* the parent has a manager specified, the first one (in the MRO) will
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# become the default.
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class Child1(AbstractBase1):
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data = models.CharField(max_length=25)
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def __unicode__(self):
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return self.data
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class Child2(AbstractBase1, AbstractBase2):
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data = models.CharField(max_length=25)
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def __unicode__(self):
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return self.data
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class Child3(AbstractBase1, AbstractBase3):
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data = models.CharField(max_length=25)
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def __unicode__(self):
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return self.data
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class Child4(AbstractBase1):
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data = models.CharField(max_length=25)
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# Should be the default manager, although the parent managers are
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# inherited.
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default = models.Manager()
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def __unicode__(self):
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return self.data
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class Child5(AbstractBase3):
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name = models.CharField(max_length=25)
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default = OnlyFred()
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objects = models.Manager()
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def __unicode__(self):
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return self.name
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# Will inherit managers from AbstractBase1, but not Child4.
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class Child6(Child4):
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value = models.IntegerField()
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# Will not inherit default manager from parent.
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class Child7(Parent):
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pass
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__test__ = {"API_TESTS": """
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>>> a1 = Child1.objects.create(name='fred', data='a1')
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>>> a2 = Child1.objects.create(name='barney', data='a2')
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>>> b1 = Child2.objects.create(name='fred', data='b1', value=1)
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>>> b2 = Child2.objects.create(name='barney', data='b2', value=42)
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>>> c1 = Child3.objects.create(name='fred', data='c1', comment='yes')
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>>> c2 = Child3.objects.create(name='barney', data='c2', comment='no')
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>>> d1 = Child4.objects.create(name='fred', data='d1')
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>>> d2 = Child4.objects.create(name='barney', data='d2')
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>>> e1 = Child5.objects.create(name='fred', comment='yes')
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>>> e2 = Child5.objects.create(name='barney', comment='no')
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>>> f1 = Child6.objects.create(name='fred', data='f1', value=42)
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>>> f2 = Child6.objects.create(name='barney', data='f2', value=42)
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>>> g1 = Child7.objects.create(name='fred')
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>>> g2 = Child7.objects.create(name='barney')
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>>> Child1.manager1.all()
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[<Child1: a1>]
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>>> Child1.manager2.all()
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[<Child1: a2>]
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>>> Child1._default_manager.all()
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[<Child1: a1>]
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>>> Child2._default_manager.all()
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[<Child2: b1>]
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>>> Child2.restricted.all()
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[<Child2: b2>]
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>>> Child3._default_manager.all()
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[<Child3: c1>]
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>>> Child3.manager1.all()
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[<Child3: c1>]
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>>> Child3.manager2.all()
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[<Child3: c2>]
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# Since Child6 inherits from Child4, the corresponding rows from f1 and f2 also
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# appear here. This is the expected result.
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>>> Child4._default_manager.order_by('data')
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[<Child4: d1>, <Child4: d2>, <Child4: f1>, <Child4: f2>]
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>>> Child4.manager1.all()
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[<Child4: d1>, <Child4: f1>]
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>>> Child5._default_manager.all()
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[<Child5: fred>]
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>>> Child6._default_manager.all()
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[<Child6: f1>]
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>>> Child7._default_manager.order_by('name')
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[<Child7: barney>, <Child7: fred>]
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"""}
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