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153 lines
4.0 KiB
153 lines
4.0 KiB
""" |
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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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