tests.py

# -*- coding: utf-8 -*-
""" Test Cases
    Please see README.rst or DOCS.rst or http://bserve.webhop.org/wiki/django_polymorphic
"""

import settings
import sys
from pprint import pprint

from django import VERSION as django_VERSION
from django.test import TestCase
from django.db.models.query import QuerySet
from django.db.models import Q,Count
from django.db import models
from django.contrib.contenttypes.models import ContentType

from polymorphic import PolymorphicModel, PolymorphicManager, PolymorphicQuerySet
from polymorphic import ShowFieldContent, ShowFieldType, ShowFieldTypeAndContent, get_version
from polymorphic import translate_polymorphic_Q_object

class PlainA(models.Model):
    field1 = models.CharField(max_length=10)
class PlainB(PlainA):
    field2 = models.CharField(max_length=10)
class PlainC(PlainB):
    field3 = models.CharField(max_length=10)

class Model2A(ShowFieldType, PolymorphicModel):
    field1 = models.CharField(max_length=10)
class Model2B(Model2A):
    field2 = models.CharField(max_length=10)
class Model2C(Model2B):
    field3 = models.CharField(max_length=10)
class Model2D(Model2C):
    field4 = models.CharField(max_length=10)

class ModelExtraA(ShowFieldTypeAndContent, PolymorphicModel):
    field1 = models.CharField(max_length=10)
class ModelExtraB(ModelExtraA):
    field2 = models.CharField(max_length=10)
class ModelExtraC(ModelExtraB):
    field3 = models.CharField(max_length=10)
class ModelExtraExternal(models.Model):
    topic = models.CharField(max_length=10)

class ModelShow1(ShowFieldType,PolymorphicModel):
    field1 = models.CharField(max_length=10)
    m2m = models.ManyToManyField('self')
class ModelShow2(ShowFieldContent, PolymorphicModel):
    field1 = models.CharField(max_length=10)
    m2m = models.ManyToManyField('self')
class ModelShow3(ShowFieldTypeAndContent, PolymorphicModel):
    field1 = models.CharField(max_length=10)
    m2m = models.ManyToManyField('self')

class ModelShow1_plain(PolymorphicModel):
    field1 = models.CharField(max_length=10)
class ModelShow2_plain(ModelShow1_plain):
    field2 = models.CharField(max_length=10)


class Base(ShowFieldType, PolymorphicModel):
    field_b = models.CharField(max_length=10)
class ModelX(Base):
    field_x = models.CharField(max_length=10)
class ModelY(Base):
    field_y = models.CharField(max_length=10)

class Enhance_Plain(models.Model):
    field_p = models.CharField(max_length=10)
class Enhance_Base(ShowFieldTypeAndContent, PolymorphicModel):
    field_b = models.CharField(max_length=10)
class Enhance_Inherit(Enhance_Base, Enhance_Plain):
    field_i = models.CharField(max_length=10)

class DiamondBase(models.Model):
    field_b = models.CharField(max_length=10)
class DiamondX(DiamondBase):
    field_x = models.CharField(max_length=10)
class DiamondY(DiamondBase):
    field_y = models.CharField(max_length=10)
class DiamondXY(DiamondX, DiamondY):
    pass

class RelationBase(ShowFieldTypeAndContent, PolymorphicModel):
    field_base = models.CharField(max_length=10)
    fk = models.ForeignKey('self', null=True)
    m2m = models.ManyToManyField('self')
class RelationA(RelationBase):
    field_a = models.CharField(max_length=10)
class RelationB(RelationBase):
    field_b = models.CharField(max_length=10)
class RelationBC(RelationB):
    field_c = models.CharField(max_length=10)

class RelatingModel(models.Model):
    many2many = models.ManyToManyField(Model2A)

class One2OneRelatingModel(PolymorphicModel):
    one2one = models.OneToOneField(Model2A)
    field1 = models.CharField(max_length=10)

class One2OneRelatingModelDerived(One2OneRelatingModel):
    field2 = models.CharField(max_length=10)

class MyManager(PolymorphicManager):
    def get_query_set(self):
        return super(MyManager, self).get_query_set().order_by('-field1')
class ModelWithMyManager(ShowFieldTypeAndContent, Model2A):
    objects = MyManager()
    field4 = models.CharField(max_length=10)

class MROBase1(ShowFieldType, PolymorphicModel):
    objects = MyManager()
    field1 = models.CharField(max_length=10) # needed as MyManager uses it
class MROBase2(MROBase1):
    pass # Django vanilla inheritance does not inherit MyManager as _default_manager here
class MROBase3(models.Model):
    objects = PolymorphicManager()
class MRODerived(MROBase2, MROBase3):
    pass

class MgrInheritA(models.Model):
    mgrA = models.Manager()
    mgrA2 = models.Manager()
    field1 = models.CharField(max_length=10)
class MgrInheritB(MgrInheritA):
    mgrB = models.Manager()
    field2 = models.CharField(max_length=10)
class MgrInheritC(ShowFieldTypeAndContent, MgrInheritB):
    pass

class BlogBase(ShowFieldTypeAndContent, PolymorphicModel):
    name = models.CharField(max_length=10)
class BlogA(BlogBase):
    info = models.CharField(max_length=10)
class BlogB(BlogBase):
    pass
class BlogEntry(ShowFieldTypeAndContent, PolymorphicModel):
    blog = models.ForeignKey(BlogA)
    text = models.CharField(max_length=10)

class BlogEntry_limit_choices_to(ShowFieldTypeAndContent, PolymorphicModel):
    blog = models.ForeignKey(BlogBase, limit_choices_to=translate_polymorphic_Q_object(BlogBase,  Q(instance_of=BlogA) ) )
    text = models.CharField(max_length=10)

class ModelFieldNameTest(ShowFieldType, PolymorphicModel):
    modelfieldnametest = models.CharField(max_length=10)

class InitTestModel(ShowFieldType, PolymorphicModel):
    bar = models.CharField(max_length=100)
    def __init__(self, *args, **kwargs):
        kwargs['bar'] = self.x()
        super(InitTestModel, self).__init__(*args, **kwargs)
class InitTestModelSubclass(InitTestModel):
    def x(self):
        return 'XYZ'


# UUID tests won't work with Django 1.1
if not (django_VERSION[0] <= 1 and django_VERSION[1] <= 1):
    try: from polymorphic.test_tools  import UUIDField
    except: pass
    if 'UUIDField' in globals():
        import uuid

        class UUIDProject(ShowFieldTypeAndContent, PolymorphicModel):
                uuid_primary_key = UUIDField(primary_key = True)
                topic = models.CharField(max_length = 30)
        class UUIDArtProject(UUIDProject):
                artist = models.CharField(max_length = 30)
        class UUIDResearchProject(UUIDProject):
                supervisor = models.CharField(max_length = 30)

        class UUIDPlainA(models.Model):
            uuid_primary_key = UUIDField(primary_key = True)
            field1 = models.CharField(max_length=10)
        class UUIDPlainB(UUIDPlainA):
            field2 = models.CharField(max_length=10)
        class UUIDPlainC(UUIDPlainB):
            field3 = models.CharField(max_length=10)


# test bad field name
#class TestBadFieldModel(ShowFieldType, PolymorphicModel):
#    instance_of = models.CharField(max_length=10)

# validation error: "polymorphic.relatednameclash: Accessor for field 'polymorphic_ctype' clashes
# with related field 'ContentType.relatednameclash_set'." (reported by Andrew Ingram)
# fixed with related_name
class RelatedNameClash(ShowFieldType, PolymorphicModel):
    ctype = models.ForeignKey(ContentType, null=True, editable=False)


class testclass(TestCase):
    def test_diamond_inheritance(self):
        # Django diamond problem
        o = DiamondXY.objects.create(field_b='b', field_x='x', field_y='y')
        print 'DiamondXY fields 1: field_b "%s", field_x "%s", field_y "%s"' % (o.field_b, o.field_x, o.field_y)
        o = DiamondXY.objects.get()
        print 'DiamondXY fields 2: field_b "%s", field_x "%s", field_y "%s"' % (o.field_b, o.field_x, o.field_y)
        if o.field_b != 'b':
            print
            print '# known django model inheritance diamond problem detected'

    def test_annotate_aggregate_order(self):

        # create a blog of type BlogA
        blog = BlogA.objects.create(name='B1', info='i1')
        # create two blog entries in BlogA
        entry1 = blog.blogentry_set.create(text='bla')
        entry2 = BlogEntry.objects.create(blog=blog, text='bla2')

        # create some blogs of type BlogB to make the BlogBase table data really polymorphic
        o = BlogB.objects.create(name='Bb1')
        o = BlogB.objects.create(name='Bb2')
        o = BlogB.objects.create(name='Bb3')

        qs = BlogBase.objects.annotate(entrycount=Count('BlogA___blogentry'))

        assert len(qs)==4

        for o in qs:
            if o.name=='B1':
                assert o.entrycount == 2
            else:
                assert o.entrycount == 0

        x = BlogBase.objects.aggregate(entrycount=Count('BlogA___blogentry'))
        assert x['entrycount'] == 2

        # create some more blogs for next test
        b2 = BlogA.objects.create(name='B2', info='i2')
        b2 = BlogA.objects.create(name='B3', info='i3')
        b2 = BlogA.objects.create(name='B4', info='i4')
        b2 = BlogA.objects.create(name='B5', info='i5')

        ### test ordering for field in all entries

        expected = '''
[ <BlogB: id 4, name (CharField) "Bb3">,
  <BlogB: id 3, name (CharField) "Bb2">,
  <BlogB: id 2, name (CharField) "Bb1">,
  <BlogA: id 8, name (CharField) "B5", info (CharField) "i5">,
  <BlogA: id 7, name (CharField) "B4", info (CharField) "i4">,
  <BlogA: id 6, name (CharField) "B3", info (CharField) "i3">,
  <BlogA: id 5, name (CharField) "B2", info (CharField) "i2">,
  <BlogA: id 1, name (CharField) "B1", info (CharField) "i1"> ]'''
        x = '\n' + repr(BlogBase.objects.order_by('-name'))
        assert x == expected

        ### test ordering for field in one subclass only

        # MySQL and SQLite return this order
        expected1='''
[ <BlogA: id 8, name (CharField) "B5", info (CharField) "i5">,
  <BlogA: id 7, name (CharField) "B4", info (CharField) "i4">,
  <BlogA: id 6, name (CharField) "B3", info (CharField) "i3">,
  <BlogA: id 5, name (CharField) "B2", info (CharField) "i2">,
  <BlogA: id 1, name (CharField) "B1", info (CharField) "i1">,
  <BlogB: id 2, name (CharField) "Bb1">,
  <BlogB: id 3, name (CharField) "Bb2">,
  <BlogB: id 4, name (CharField) "Bb3"> ]'''

        # PostgreSQL returns this order
        expected2='''
[ <BlogB: id 2, name (CharField) "Bb1">,
  <BlogB: id 3, name (CharField) "Bb2">,
  <BlogB: id 4, name (CharField) "Bb3">,
  <BlogA: id 8, name (CharField) "B5", info (CharField) "i5">,
  <BlogA: id 7, name (CharField) "B4", info (CharField) "i4">,
  <BlogA: id 6, name (CharField) "B3", info (CharField) "i3">,
  <BlogA: id 5, name (CharField) "B2", info (CharField) "i2">,
  <BlogA: id 1, name (CharField) "B1", info (CharField) "i1"> ]'''

        x = '\n' + repr(BlogBase.objects.order_by('-BlogA___info'))
        assert x == expected1 or x == expected2


    def test_limit_choices_to(self):
        "this is not really a testcase, as limit_choices_to only affects the Django admin"
        # create a blog of type BlogA
        blog_a = BlogA.objects.create(name='aa', info='aa')
        blog_b = BlogB.objects.create(name='bb')
        # create two blog entries
        entry1 = BlogEntry_limit_choices_to.objects.create(blog=blog_b, text='bla2')
        entry2 = BlogEntry_limit_choices_to.objects.create(blog=blog_b, text='bla2')


    def test_primary_key_custom_field_problem(self):
        "object retrieval problem occuring with some custom primary key fields (UUIDField as test case)"
        if not 'UUIDField' in globals(): return
        a=UUIDProject.objects.create(topic="John's gathering")
        b=UUIDArtProject.objects.create(topic="Sculpting with Tim", artist="T. Turner")
        c=UUIDResearchProject.objects.create(topic="Swallow Aerodynamics", supervisor="Dr. Winter")
        qs=UUIDProject.objects.all()
        ol=list(qs)
        a=qs[0]
        b=qs[1]
        c=qs[2]
        assert len(qs)==3
        assert type(a.uuid_primary_key)==uuid.UUID and type(a.pk)==uuid.UUID
        res=repr(qs)
        import re
        res=re.sub(' "(.*?)..", topic',', topic',res)
        res_exp="""[ <UUIDProject: uuid_primary_key (UUIDField/pk), topic (CharField) "John's gathering">,
  <UUIDArtProject: uuid_primary_key (UUIDField/pk), topic (CharField) "Sculpting with Tim", artist (CharField) "T. Turner">,
  <UUIDResearchProject: uuid_primary_key (UUIDField/pk), topic (CharField) "Swallow Aerodynamics", supervisor (CharField) "Dr. Winter"> ]"""
        assert res==res_exp, res
        #if (a.pk!= uuid.UUID or c.pk!= uuid.UUID):
        #    print
        #    print '# known inconstency with custom primary key field detected (django problem?)'

        a=UUIDPlainA.objects.create(field1='A1')
        b=UUIDPlainB.objects.create(field1='B1', field2='B2')
        c=UUIDPlainC.objects.create(field1='C1', field2='C2', field3='C3')
        qs=UUIDPlainA.objects.all()
        if (a.pk!= uuid.UUID or c.pk!= uuid.UUID):
            print
            print '# known type inconstency with custom primary key field detected (django problem?)'


def show_base_manager(model):
    print type(model._base_manager),model._base_manager.model

__test__ = {"doctest": """
#######################################################
### Tests

>>> settings.DEBUG=True


### simple inheritance

>>> o=Model2A.objects.create(field1='A1')
>>> o=Model2B.objects.create(field1='B1', field2='B2')
>>> o=Model2C.objects.create(field1='C1', field2='C2', field3='C3')
>>> o=Model2D.objects.create(field1='D1', field2='D2', field3='D3', field4='D4')
>>> Model2A.objects.all()
[ <Model2A: id 1, field1 (CharField)>,
  <Model2B: id 2, field1 (CharField), field2 (CharField)>,
  <Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>,
  <Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)> ]

# manual get_real_instance()
>>> o=Model2A.objects.non_polymorphic().get(field1='C1')
>>> o.get_real_instance()
<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>

# non_polymorphic()
>>> qs=Model2A.objects.all().non_polymorphic()
>>> qs
[ <Model2A: id 1, field1 (CharField)>,
  <Model2A: id 2, field1 (CharField)>,
  <Model2A: id 3, field1 (CharField)>,
  <Model2A: id 4, field1 (CharField)> ]

# get_real_instances()
>>> qs.get_real_instances()
[ <Model2A: id 1, field1 (CharField)>,
  <Model2B: id 2, field1 (CharField), field2 (CharField)>,
  <Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>,
  <Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)> ]

>>> l=list(qs)
>>> Model2A.objects.get_real_instances(l)
[ <Model2A: id 1, field1 (CharField)>,
  <Model2B: id 2, field1 (CharField), field2 (CharField)>,
  <Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>,
  <Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)> ]


### test inheritance pointers & _base_managers

>>> show_base_manager(PlainA)
<class 'django.db.models.manager.Manager'> <class 'polymorphic.tests.PlainA'>
>>> show_base_manager(PlainB)
<class 'django.db.models.manager.Manager'> <class 'polymorphic.tests.PlainB'>
>>> show_base_manager(PlainC)
<class 'django.db.models.manager.Manager'> <class 'polymorphic.tests.PlainC'>
>>> show_base_manager(Model2A)
<class 'polymorphic.manager.PolymorphicManager'> <class 'polymorphic.tests.Model2A'>
>>> show_base_manager(Model2B)
<class 'django.db.models.manager.Manager'> <class 'polymorphic.tests.Model2B'>
>>> show_base_manager(Model2C)
<class 'django.db.models.manager.Manager'> <class 'polymorphic.tests.Model2C'>
>>> show_base_manager(One2OneRelatingModel)
<class 'polymorphic.manager.PolymorphicManager'> <class 'polymorphic.tests.One2OneRelatingModel'>
>>> show_base_manager(One2OneRelatingModelDerived)
<class 'django.db.models.manager.Manager'> <class 'polymorphic.tests.One2OneRelatingModelDerived'>

>>> o=Model2A.base_objects.get(field1='C1')
>>> o.model2b
<Model2B: id 3, field1 (CharField), field2 (CharField)>

>>> o=Model2B.base_objects.get(field1='C1')
>>> o.model2c
<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>


### OneToOneField, test both directions for polymorphism

>>> a=Model2A.base_objects.get(field1='C1')
>>> b=One2OneRelatingModelDerived.objects.create(one2one=a, field1='f1', field2='f2')
>>> b.one2one  # this result is basically wrong, probably due to Django cacheing (we used base_objects), but should not be a problem
<Model2A: id 3, field1 (CharField)>
>>> c=One2OneRelatingModelDerived.objects.get(field1='f1')
>>> c.one2one
<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>

>>> a.one2onerelatingmodel
<One2OneRelatingModelDerived: One2OneRelatingModelDerived object>


### ShowFieldContent, ShowFieldType, ShowFieldTypeAndContent, also with annotate()

>>> o=ModelShow1.objects.create(field1='abc')
>>> o.m2m.add(o) ; o.save()
>>> ModelShow1.objects.all()
[ <ModelShow1: id 1, field1 (CharField), m2m (ManyToManyField)> ]

>>> o=ModelShow2.objects.create(field1='abc')
>>> o.m2m.add(o) ; o.save()
>>> ModelShow2.objects.all()
[ <ModelShow2: id 1, field1 "abc", m2m 1> ]

>>> o=ModelShow3.objects.create(field1='abc')
>>> o.m2m.add(o) ; o.save()
>>> ModelShow3.objects.all()
[ <ModelShow3: id 1, field1 (CharField) "abc", m2m (ManyToManyField) 1> ]

>>> ModelShow1.objects.all().annotate(Count('m2m'))
[ <ModelShow1: id 1, field1 (CharField), m2m (ManyToManyField) - Ann: m2m__count (int)> ]
>>> ModelShow2.objects.all().annotate(Count('m2m'))
[ <ModelShow2: id 1, field1 "abc", m2m 1 - Ann: m2m__count 1> ]
>>> ModelShow3.objects.all().annotate(Count('m2m'))
[ <ModelShow3: id 1, field1 (CharField) "abc", m2m (ManyToManyField) 1 - Ann: m2m__count (int) 1> ]

# no pretty printing
>>> o=ModelShow1_plain.objects.create(field1='abc')
>>> o=ModelShow2_plain.objects.create(field1='abc', field2='def')
>>> ModelShow1_plain.objects.all()
[<ModelShow1_plain: ModelShow1_plain object>, <ModelShow2_plain: ModelShow2_plain object>]


### extra() method

>>> Model2A.objects.extra(where=['id IN (2, 3)'])
[ <Model2B: id 2, field1 (CharField), field2 (CharField)>,
  <Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)> ]

>>> Model2A.objects.extra(select={"select_test": "field1 = 'A1'"}, where=["field1 = 'A1' OR field1 = 'B1'"], order_by = ['-id'] )
[ <Model2B: id 2, field1 (CharField), field2 (CharField) - Extra: select_test (int)>,
  <Model2A: id 1, field1 (CharField) - Extra: select_test (int)> ]

>>> o=ModelExtraA.objects.create(field1='A1')
>>> o=ModelExtraB.objects.create(field1='B1', field2='B2')
>>> o=ModelExtraC.objects.create(field1='C1', field2='C2', field3='C3')
>>> o=ModelExtraExternal.objects.create(topic='extra1')
>>> o=ModelExtraExternal.objects.create(topic='extra2')
>>> o=ModelExtraExternal.objects.create(topic='extra3')
>>> ModelExtraA.objects.extra(tables=["polymorphic_modelextraexternal"], select={"topic":"polymorphic_modelextraexternal.topic"}, where=["polymorphic_modelextraa.id = polymorphic_modelextraexternal.id"] )
[ <ModelExtraA: id 1, field1 (CharField) "A1" - Extra: topic (unicode) "extra1">,
  <ModelExtraB: id 2, field1 (CharField) "B1", field2 (CharField) "B2" - Extra: topic (unicode) "extra2">,
  <ModelExtraC: id 3, field1 (CharField) "C1", field2 (CharField) "C2", field3 (CharField) "C3" - Extra: topic (unicode) "extra3"> ]

### class filtering, instance_of, not_instance_of

>>> Model2A.objects.instance_of(Model2B)
[ <Model2B: id 2, field1 (CharField), field2 (CharField)>,
  <Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>,
  <Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)> ]

>>> Model2A.objects.filter(instance_of=Model2B)
[ <Model2B: id 2, field1 (CharField), field2 (CharField)>,
  <Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>,
  <Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)> ]

>>> Model2A.objects.filter(Q(instance_of=Model2B))
[ <Model2B: id 2, field1 (CharField), field2 (CharField)>,
  <Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>,
  <Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)> ]

>>> Model2A.objects.not_instance_of(Model2B)
[ <Model2A: id 1, field1 (CharField)> ]


### polymorphic filtering

>>> Model2A.objects.filter(  Q( Model2B___field2 = 'B2' )  |  Q( Model2C___field3 = 'C3' )  )
[ <Model2B: id 2, field1 (CharField), field2 (CharField)>,
  <Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)> ]


### get & delete

>>> oa=Model2A.objects.get(id=2)
>>> oa
<Model2B: id 2, field1 (CharField), field2 (CharField)>

>>> oa.delete()
>>> Model2A.objects.all()
[ <Model2A: id 1, field1 (CharField)>,
  <Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>,
  <Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)> ]


### queryset combining

>>> o=ModelX.objects.create(field_x='x')
>>> o=ModelY.objects.create(field_y='y')

>>> Base.objects.instance_of(ModelX) | Base.objects.instance_of(ModelY)
[ <ModelX: id 1, field_b (CharField), field_x (CharField)>,
  <ModelY: id 2, field_b (CharField), field_y (CharField)> ]


### multiple inheritance, subclassing third party models (mix PolymorphicModel with models.Model)

>>> o = Enhance_Base.objects.create(field_b='b-base')
>>> o = Enhance_Inherit.objects.create(field_b='b-inherit', field_p='p', field_i='i')

>>> Enhance_Base.objects.all()
[ <Enhance_Base: id 1, field_b (CharField) "b-base">,
  <Enhance_Inherit: id 2, field_b (CharField) "b-inherit", field_p (CharField) "p", field_i (CharField) "i"> ]


### ForeignKey, ManyToManyField

>>> obase=RelationBase.objects.create(field_base='base')
>>> oa=RelationA.objects.create(field_base='A1', field_a='A2', fk=obase)
>>> ob=RelationB.objects.create(field_base='B1', field_b='B2', fk=oa)
>>> oc=RelationBC.objects.create(field_base='C1', field_b='C2', field_c='C3', fk=oa)
>>> oa.m2m.add(oa); oa.m2m.add(ob)

>>> RelationBase.objects.all()
[ <RelationBase: id 1, field_base (CharField) "base", fk (ForeignKey) None, m2m (ManyToManyField) 0>,
  <RelationA: id 2, field_base (CharField) "A1", fk (ForeignKey) RelationBase, field_a (CharField) "A2", m2m (ManyToManyField) 2>,
  <RelationB: id 3, field_base (CharField) "B1", fk (ForeignKey) RelationA, field_b (CharField) "B2", m2m (ManyToManyField) 1>,
  <RelationBC: id 4, field_base (CharField) "C1", fk (ForeignKey) RelationA, field_b (CharField) "C2", field_c (CharField) "C3", m2m (ManyToManyField) 0> ]

>>> oa=RelationBase.objects.get(id=2)
>>> oa.fk
<RelationBase: id 1, field_base (CharField) "base", fk (ForeignKey) None, m2m (ManyToManyField) 0>

>>> oa.relationbase_set.all()
[ <RelationB: id 3, field_base (CharField) "B1", fk (ForeignKey) RelationA, field_b (CharField) "B2", m2m (ManyToManyField) 1>,
  <RelationBC: id 4, field_base (CharField) "C1", fk (ForeignKey) RelationA, field_b (CharField) "C2", field_c (CharField) "C3", m2m (ManyToManyField) 0> ]

>>> ob=RelationBase.objects.get(id=3)
>>> ob.fk
<RelationA: id 2, field_base (CharField) "A1", fk (ForeignKey) RelationBase, field_a (CharField) "A2", m2m (ManyToManyField) 2>

>>> oa=RelationA.objects.get()
>>> oa.m2m.all()
[ <RelationA: id 2, field_base (CharField) "A1", fk (ForeignKey) RelationBase, field_a (CharField) "A2", m2m (ManyToManyField) 2>,
  <RelationB: id 3, field_base (CharField) "B1", fk (ForeignKey) RelationA, field_b (CharField) "B2", m2m (ManyToManyField) 1> ]

### user-defined manager

>>> o=ModelWithMyManager.objects.create(field1='D1a', field4='D4a')
>>> o=ModelWithMyManager.objects.create(field1='D1b', field4='D4b')

>>> ModelWithMyManager.objects.all()
[ <ModelWithMyManager: id 6, field1 (CharField) "D1b", field4 (CharField) "D4b">,
  <ModelWithMyManager: id 5, field1 (CharField) "D1a", field4 (CharField) "D4a"> ]

>>> type(ModelWithMyManager.objects)
<class 'polymorphic.tests.MyManager'>
>>> type(ModelWithMyManager._default_manager)
<class 'polymorphic.tests.MyManager'>


### Manager Inheritance

>>> type(MRODerived.objects) # MRO
<class 'polymorphic.tests.MyManager'>

# check for correct default manager
>>> type(MROBase1._default_manager)
<class 'polymorphic.tests.MyManager'>

# Django vanilla inheritance does not inherit MyManager as _default_manager here
>>> type(MROBase2._default_manager)
<class 'polymorphic.tests.MyManager'>


### fixed issue in PolymorphicModel.__getattribute__: field name same as model name
>>> ModelFieldNameTest.objects.create(modelfieldnametest='1')
<ModelFieldNameTest: id 1, modelfieldnametest (CharField)>


### fixed issue in PolymorphicModel.__getattribute__:
# if subclass defined __init__ and accessed class members, __getattribute__ had a problem: "...has no attribute 'sub_and_superclass_dict'"
#>>> o
>>> o = InitTestModelSubclass.objects.create()
>>> o.bar
'XYZ'


### Django model inheritance diamond problem, fails for Django 1.1

#>>> o=DiamondXY.objects.create(field_b='b', field_x='x', field_y='y')
#>>> print 'DiamondXY fields 1: field_b "%s", field_x "%s", field_y "%s"' % (o.field_b, o.field_x, o.field_y)
#DiamondXY fields 1: field_b "a", field_x "x", field_y "y"


>>> settings.DEBUG=False

"""}