245 lines
9.0 KiB
Python
245 lines
9.0 KiB
Python
# -*- coding: utf-8 -*-
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import settings
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from django.test import TestCase
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from django.db.models.query import QuerySet
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from django.db.models import Q
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from django.db import models
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from django.contrib.contenttypes.models import ContentType
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from models import PolymorphicModel, PolymorphicManager, PolymorphicQuerySet, ShowFields, ShowFieldsAndTypes
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class PlainA(models.Model):
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field1 = models.CharField(max_length=10)
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class PlainB(PlainA):
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field2 = models.CharField(max_length=10)
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class PlainC(PlainB):
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field3 = models.CharField(max_length=10)
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class Model2A(PolymorphicModel):
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field1 = models.CharField(max_length=10)
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class Model2B(Model2A):
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field2 = models.CharField(max_length=10)
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class Model2C(Model2B):
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field3 = models.CharField(max_length=10)
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class Base(PolymorphicModel):
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field_b = models.CharField(max_length=10)
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class ModelX(Base):
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field_x = models.CharField(max_length=10)
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class ModelY(Base):
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field_y = models.CharField(max_length=10)
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class Enhance_Plain(models.Model):
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field_p = models.CharField(max_length=10)
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class Enhance_Base(ShowFieldsAndTypes, PolymorphicModel):
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field_b = models.CharField(max_length=10)
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class Enhance_Inherit(Enhance_Base, Enhance_Plain):
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field_i = models.CharField(max_length=10)
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class DiamondBase(models.Model):
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field_b = models.CharField(max_length=10)
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class DiamondX(DiamondBase):
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field_x = models.CharField(max_length=10)
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class DiamondY(DiamondBase):
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field_y = models.CharField(max_length=10)
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class DiamondXY(DiamondX, DiamondY):
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pass
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class RelationBase(ShowFieldsAndTypes, PolymorphicModel):
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field_base = models.CharField(max_length=10)
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fk = models.ForeignKey('self', null=True)
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m2m = models.ManyToManyField('self')
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class RelationA(RelationBase):
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field_a = models.CharField(max_length=10)
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class RelationB(RelationBase):
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field_b = models.CharField(max_length=10)
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class RelationBC(RelationB):
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field_c = models.CharField(max_length=10)
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class RelatingModel(models.Model):
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many2many = models.ManyToManyField(Model2A)
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class MyManager(PolymorphicManager):
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def get_query_set(self):
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return super(MyManager, self).get_query_set().order_by('-field1')
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class ModelWithMyManager(ShowFieldsAndTypes, Model2A):
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objects = MyManager()
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field4 = models.CharField(max_length=10)
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class MROBase1(PolymorphicModel):
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objects = MyManager()
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field1 = models.CharField(max_length=10) # needed as MyManager uses it
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class MROBase2(MROBase1):
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pass # Django vanilla inheritance does not inherit MyManager as _default_manager here
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class MROBase3(models.Model):
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objects = PolymorphicManager()
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class MRODerived(MROBase2, MROBase3):
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pass
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class MgrInheritA(models.Model):
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mgrA = models.Manager()
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mgrA2 = models.Manager()
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field1 = models.CharField(max_length=10)
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class MgrInheritB(MgrInheritA):
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mgrB = models.Manager()
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field2 = models.CharField(max_length=10)
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class MgrInheritC(ShowFieldsAndTypes, MgrInheritB):
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pass
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# test bad field name
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#class TestBadFieldModel(PolymorphicModel):
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# instance_of = models.CharField(max_length=10)
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# validation error: "polymorphic.relatednameclash: Accessor for field 'polymorphic_ctype' clashes
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# with related field 'ContentType.relatednameclash_set'." (reported by Andrew Ingram)
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# fixed with related_name
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class RelatedNameClash(PolymorphicModel):
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ctype = models.ForeignKey(ContentType, null=True, editable=False)
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class testclass(TestCase):
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def test_diamond_inheritance(self):
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# Django diamond problem
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o = DiamondXY.objects.create(field_b='b', field_x='x', field_y='y')
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print 'DiamondXY fields 1: field_b "%s", field_x "%s", field_y "%s"' % (o.field_b, o.field_x, o.field_y)
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o = DiamondXY.objects.get()
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print 'DiamondXY fields 2: field_b "%s", field_x "%s", field_y "%s"' % (o.field_b, o.field_x, o.field_y)
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if o.field_b != 'b': print '# Django model inheritance diamond problem detected'
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__test__ = {"doctest": """
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#######################################################
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### Tests
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>>> settings.DEBUG=True
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### simple inheritance
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>>> o=Model2A.objects.create(field1='A1')
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>>> o=Model2B.objects.create(field1='B1', field2='B2')
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>>> o=Model2C.objects.create(field1='C1', field2='C2', field3='C3')
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>>> Model2A.objects.all()
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[ <Model2A: id 1, field1 (CharField)>,
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<Model2B: id 2, field1 (CharField), field2 (CharField)>,
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<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)> ]
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# manual get_real_instance()
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>>> o=Model2A.base_objects.get(field1='C1')
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>>> o.get_real_instance()
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<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>
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### class filtering, instance_of, not_instance_of
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>>> Model2A.objects.instance_of(Model2B)
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[ <Model2B: id 2, field1 (CharField), field2 (CharField)>,
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<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)> ]
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>>> Model2A.objects.not_instance_of(Model2B)
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[ <Model2A: id 1, field1 (CharField)> ]
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### polymorphic filtering
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>>> Model2A.objects.filter( Q( Model2B___field2 = 'B2' ) | Q( Model2C___field3 = 'C3' ) )
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[ <Model2B: id 2, field1 (CharField), field2 (CharField)>,
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<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)> ]
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### get & delete
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>>> oa=Model2A.objects.get(id=2)
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>>> oa
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<Model2B: id 2, field1 (CharField), field2 (CharField)>
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>>> oa.delete()
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>>> Model2A.objects.all()
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[ <Model2A: id 1, field1 (CharField)>,
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<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)> ]
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### queryset combining
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>>> o=ModelX.objects.create(field_x='x')
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>>> o=ModelY.objects.create(field_y='y')
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>>> Base.objects.instance_of(ModelX) | Base.objects.instance_of(ModelY)
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[ <ModelX: id 1, field_b (CharField), field_x (CharField)>,
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<ModelY: id 2, field_b (CharField), field_y (CharField)> ]
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### multiple inheritance, subclassing third party models (mix PolymorphicModel with models.Model)
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>>> o = Enhance_Base.objects.create(field_b='b-base')
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>>> o = Enhance_Inherit.objects.create(field_b='b-inherit', field_p='p', field_i='i')
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>>> Enhance_Base.objects.all()
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[ <Enhance_Base: id 1, field_b (CharField): "b-base">,
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<Enhance_Inherit: id 2, field_b (CharField): "b-inherit", field_p (CharField): "p", field_i (CharField): "i"> ]
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### ForeignKey, ManyToManyField
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>>> obase=RelationBase.objects.create(field_base='base')
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>>> oa=RelationA.objects.create(field_base='A1', field_a='A2', fk=obase)
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>>> ob=RelationB.objects.create(field_base='B1', field_b='B2', fk=oa)
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>>> oc=RelationBC.objects.create(field_base='C1', field_b='C2', field_c='C3', fk=oa)
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>>> oa.m2m.add(oa); oa.m2m.add(ob)
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>>> RelationBase.objects.all()
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[ <RelationBase: id 1, field_base (CharField): "base", fk (ForeignKey): "None">,
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<RelationA: id 2, field_base (CharField): "A1", fk (ForeignKey): "RelationBase", field_a (CharField): "A2">,
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<RelationB: id 3, field_base (CharField): "B1", fk (ForeignKey): "RelationA", field_b (CharField): "B2">,
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<RelationBC: id 4, field_base (CharField): "C1", fk (ForeignKey): "RelationA", field_b (CharField): "C2", field_c (CharField): "C3"> ]
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>>> oa=RelationBase.objects.get(id=2)
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>>> oa.fk
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<RelationBase: id 1, field_base (CharField): "base", fk (ForeignKey): "None">
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>>> oa.relationbase_set.all()
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[ <RelationB: id 3, field_base (CharField): "B1", fk (ForeignKey): "RelationA", field_b (CharField): "B2">,
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<RelationBC: id 4, field_base (CharField): "C1", fk (ForeignKey): "RelationA", field_b (CharField): "C2", field_c (CharField): "C3"> ]
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>>> ob=RelationBase.objects.get(id=3)
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>>> ob.fk
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<RelationA: id 2, field_base (CharField): "A1", fk (ForeignKey): "RelationBase", field_a (CharField): "A2">
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>>> oa=RelationA.objects.get()
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>>> oa.m2m.all()
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[ <RelationA: id 2, field_base (CharField): "A1", fk (ForeignKey): "RelationBase", field_a (CharField): "A2">,
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<RelationB: id 3, field_base (CharField): "B1", fk (ForeignKey): "RelationA", field_b (CharField): "B2"> ]
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### user-defined manager
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>>> o=ModelWithMyManager.objects.create(field1='D1a', field4='D4a')
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>>> o=ModelWithMyManager.objects.create(field1='D1b', field4='D4b')
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>>> ModelWithMyManager.objects.all()
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[ <ModelWithMyManager: id 5, field1 (CharField): "D1b", field4 (CharField): "D4b">,
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<ModelWithMyManager: id 4, field1 (CharField): "D1a", field4 (CharField): "D4a"> ]
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>>> type(ModelWithMyManager.objects)
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<class 'polymorphic.tests.MyManager'>
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>>> type(ModelWithMyManager._default_manager)
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<class 'polymorphic.tests.MyManager'>
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### Manager Inheritance
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>>> type(MRODerived.objects) # MRO
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<class 'polymorphic.tests.MyManager'>
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# check for correct default manager
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>>> type(MROBase1._default_manager)
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<class 'polymorphic.tests.MyManager'>
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# Django vanilla inheritance does not inherit MyManager as _default_manager here
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>>> type(MROBase2._default_manager)
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<class 'polymorphic.tests.MyManager'>
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### Django model inheritance diamond problem, fails for Django 1.1
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#>>> o=DiamondXY.objects.create(field_b='b', field_x='x', field_y='y')
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#>>> print 'DiamondXY fields 1: field_b "%s", field_x "%s", field_y "%s"' % (o.field_b, o.field_x, o.field_y)
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#DiamondXY fields 1: field_b "a", field_x "x", field_y "y"
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>>> settings.DEBUG=False
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"""}
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