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Feature: Create from super #65

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Feature: Create from super #65

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2870d2c
Most of the repr tests should be replaced with something more robust.…
JCoxwell Oct 21, 2013
540ca52
create_from_super feature with test. This feature creates a subclass …
JCoxwell Oct 21, 2013
bf5d080
move create_from_super to PolymorphicQuerySet for API consistency
JCoxwell Jan 10, 2014
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29 changes: 29 additions & 0 deletions polymorphic/query.py
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Original file line number Diff line number Diff line change
Expand Up @@ -306,3 +306,32 @@ def get_real_instances(self, base_result_objects=None):
return olist
clist = PolymorphicQuerySet._p_list_class(olist)
return clist

def create_from_super(self, obj, **kwargs):
"""Creates an instance of self.model (cls) from existing super class.
The new subclass will be the same object with same database id
and data as obj, but will be an instance of cls.

obj must be an instance of the direct superclass of cls.
kwargs should contain all required fields of the subclass (cls).

returns obj as an instance of cls.
"""
cls = self.model
import inspect
scls = inspect.getmro(cls)[1]
if scls != type(obj):
raise Exception('create_from_super can only be used if obj is one level of inheritance up from cls')
ptr = '{}_ptr_id'.format(scls.__name__.lower())
kwargs[ptr] = obj.id
# create the new base class with only fields that apply to it.
nobj = cls(**kwargs)
nobj.save_base(raw=True)
# force update the content type, but first we need to
# retrieve a clean copy from the db to fill in the null
# fields otherwise they would be overwritten.
nobj = cls.objects.get(pk=obj.pk)
nobj.polymorphic_ctype = ContentType.objects.get_for_model(cls)
nobj.save()

return nobj.get_real_instance() # cast to cls
146 changes: 85 additions & 61 deletions polymorphic/tests.py
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Original file line number Diff line number Diff line change
Expand Up @@ -293,17 +293,18 @@ def test_annotate_aggregate_order(self):
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'))
self.assertEqual(x, expected)
expected = \
[ '<BlogB: id {}, name (CharField) "Bb3">',
'<BlogB: id {}, name (CharField) "Bb2">',
'<BlogB: id {}, name (CharField) "Bb1">',
'<BlogA: id {}, name (CharField) "B5", info (CharField) "i5">',
'<BlogA: id {}, name (CharField) "B4", info (CharField) "i4">',
'<BlogA: id {}, name (CharField) "B3", info (CharField) "i3">',
'<BlogA: id {}, name (CharField) "B2", info (CharField) "i2">',
'<BlogA: id {}, name (CharField) "B1", info (CharField) "i1">']
objects = list(BlogBase.objects.order_by('-name'))
for i,o in enumerate(objects):
self.assertEqual(repr(o), expected[i].format(o.id))

# test ordering for field in one subclass only
# MySQL and SQLite return this order
Expand All @@ -328,8 +329,9 @@ def test_annotate_aggregate_order(self):
<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'))
self.assertTrue(x == expected1 or x == expected2)
# order is undefined! why test for specific order?
#x = '\n' + repr(BlogBase.objects.order_by('-BlogA___info'))
#self.assertTrue(x == expected1 or x == expected2)


def test_limit_choices_to(self):
Expand Down Expand Up @@ -394,27 +396,28 @@ def test_simple_inheritance(self):
self.create_model2abcd()

objects = list(Model2A.objects.all())
self.assertEqual(repr(objects[0]), '<Model2A: id 1, field1 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2B: id 2, field1 (CharField), field2 (CharField)>')
self.assertEqual(repr(objects[2]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(objects[3]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2A: id {}, field1 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2B: id {}, field1 (CharField), field2 (CharField)>'.format(objects[1].id))
self.assertEqual(repr(objects[2]), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(objects[2].id))
self.assertEqual(repr(objects[3]), '<Model2D: id {}, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>'.format(objects[3].id))


def test_manual_get_real_instance(self):
self.create_model2abcd()

o = Model2A.objects.non_polymorphic().get(field1='C1')
self.assertEqual(repr(o.get_real_instance()), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
o = o.get_real_instance()
self.assertEqual(repr(o), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(o.id))


def test_non_polymorphic(self):
self.create_model2abcd()

objects = list(Model2A.objects.all().non_polymorphic())
self.assertEqual(repr(objects[0]), '<Model2A: id 1, field1 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2A: id 2, field1 (CharField)>')
self.assertEqual(repr(objects[2]), '<Model2A: id 3, field1 (CharField)>')
self.assertEqual(repr(objects[3]), '<Model2A: id 4, field1 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2A: id {}, field1 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2A: id {}, field1 (CharField)>'.format(objects[1].id))
self.assertEqual(repr(objects[2]), '<Model2A: id {}, field1 (CharField)>'.format(objects[2].id))
self.assertEqual(repr(objects[3]), '<Model2A: id {}, field1 (CharField)>'.format(objects[3].id))


def test_get_real_instances(self):
Expand All @@ -423,26 +426,26 @@ def test_get_real_instances(self):

# from queryset
objects = qs.get_real_instances()
self.assertEqual(repr(objects[0]), '<Model2A: id 1, field1 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2B: id 2, field1 (CharField), field2 (CharField)>')
self.assertEqual(repr(objects[2]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(objects[3]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2A: id {}, field1 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2B: id {}, field1 (CharField), field2 (CharField)>'.format(objects[1].id))
self.assertEqual(repr(objects[2]), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(objects[2].id))
self.assertEqual(repr(objects[3]), '<Model2D: id {}, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>'.format(objects[3].id))

# from a manual list
objects = Model2A.objects.get_real_instances(list(qs))
self.assertEqual(repr(objects[0]), '<Model2A: id 1, field1 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2B: id 2, field1 (CharField), field2 (CharField)>')
self.assertEqual(repr(objects[2]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(objects[3]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2A: id {}, field1 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2B: id {}, field1 (CharField), field2 (CharField)>'.format(objects[1].id))
self.assertEqual(repr(objects[2]), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(objects[2].id))
self.assertEqual(repr(objects[3]), '<Model2D: id {}, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>'.format(objects[3].id))


def test_translate_polymorphic_q_object(self):
self.create_model2abcd()

q = Model2A.translate_polymorphic_Q_object(Q(instance_of=Model2C))
objects = Model2A.objects.filter(q)
self.assertEqual(repr(objects[0]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2D: id {}, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>'.format(objects[1].id))


def test_base_manager(self):
Expand All @@ -468,10 +471,10 @@ def test_foreignkey_field(self):
self.create_model2abcd()

object2a = Model2A.base_objects.get(field1='C1')
self.assertEqual(repr(object2a.model2b), '<Model2B: id 3, field1 (CharField), field2 (CharField)>')
self.assertEqual(repr(object2a.model2b), '<Model2B: id {}, field1 (CharField), field2 (CharField)>'.format(object2a.model2b.id))

object2b = Model2B.base_objects.get(field1='C1')
self.assertEqual(repr(object2b.model2c), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(object2b.model2c), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(object2b.model2c.id))


def test_onetoone_field(self):
Expand All @@ -481,10 +484,10 @@ def test_onetoone_field(self):
b = One2OneRelatingModelDerived.objects.create(one2one=a, field1='f1', field2='f2')

# this result is basically wrong, probably due to Django cacheing (we used base_objects), but should not be a problem
self.assertEqual(repr(b.one2one), '<Model2A: id 3, field1 (CharField)>')
self.assertEqual(repr(b.one2one), '<Model2A: id {}, field1 (CharField)>'.format(b.one2one.id))

c = One2OneRelatingModelDerived.objects.get(field1='f1')
self.assertEqual(repr(c.one2one), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(c.one2one), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(c.one2one.id))
self.assertEqual(repr(a.one2onerelatingmodel), '<One2OneRelatingModelDerived: One2OneRelatingModelDerived object>')


Expand Down Expand Up @@ -519,13 +522,14 @@ def test_manytomany_field(self):
def test_extra_method(self):
self.create_model2abcd()

objects = list(Model2A.objects.extra(where=['id IN (2, 3)']))
self.assertEqual(repr(objects[0]), '<Model2B: id 2, field1 (CharField), field2 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
objects = Model2A.objects.all()
objects = list(Model2A.objects.extra(where=['id IN ({}, {})'.format(objects[1].id,objects[2].id)]))
self.assertEqual(repr(objects[0]), '<Model2B: id {}, field1 (CharField), field2 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(objects[1].id))

objects = Model2A.objects.extra(select={"select_test": "field1 = 'A1'"}, where=["field1 = 'A1' OR field1 = 'B1'"], order_by=['-id'])
self.assertEqual(repr(objects[0]), '<Model2B: id 2, field1 (CharField), field2 (CharField) - Extra: select_test (int)>')
self.assertEqual(repr(objects[1]), '<Model2A: id 1, field1 (CharField) - Extra: select_test (int)>')
self.assertEqual(repr(objects[0]), '<Model2B: id {}, field1 (CharField), field2 (CharField) - Extra: select_test ({})>'.format(objects[0].id,type(objects[1].id).__name__))
self.assertEqual(repr(objects[1]), '<Model2A: id {}, field1 (CharField) - Extra: select_test ({})>'.format(objects[1].id,type(objects[1].id).__name__))
self.assertEqual(len(objects), 2) # Placed after the other tests, only verifying whether there are no more additional objects.

ModelExtraA.objects.create(field1='A1')
Expand All @@ -550,49 +554,49 @@ def test_instance_of_filter(self):
self.create_model2abcd()

objects = Model2A.objects.instance_of(Model2B)
self.assertEqual(repr(objects[0]), '<Model2B: id 2, field1 (CharField), field2 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(objects[2]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2B: id {}, field1 (CharField), field2 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(objects[1].id))
self.assertEqual(repr(objects[2]), '<Model2D: id {}, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>'.format(objects[2].id))
self.assertEqual(len(objects), 3)

objects = Model2A.objects.filter(instance_of=Model2B)
self.assertEqual(repr(objects[0]), '<Model2B: id 2, field1 (CharField), field2 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(objects[2]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2B: id {}, field1 (CharField), field2 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(objects[1].id))
self.assertEqual(repr(objects[2]), '<Model2D: id {}, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>'.format(objects[2].id))
self.assertEqual(len(objects), 3)

objects = Model2A.objects.filter(Q(instance_of=Model2B))
self.assertEqual(repr(objects[0]), '<Model2B: id 2, field1 (CharField), field2 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(objects[2]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2B: id {}, field1 (CharField), field2 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(objects[1].id))
self.assertEqual(repr(objects[2]), '<Model2D: id {}, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>'.format(objects[2].id))
self.assertEqual(len(objects), 3)

objects = Model2A.objects.not_instance_of(Model2B)
self.assertEqual(repr(objects[0]), '<Model2A: id 1, field1 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2A: id {}, field1 (CharField)>'.format(objects[0].id))
self.assertEqual(len(objects), 1)


def test_polymorphic___filter(self):
self.create_model2abcd()

objects = Model2A.objects.filter(Q( Model2B___field2='B2') | Q( Model2C___field3='C3'))
objects = Model2A.objects.filter(Q( Model2B___field2='B2') | Q( Model2C___field3='C3')).order_by('id')
self.assertEqual(len(objects), 2)
self.assertEqual(repr(objects[0]), '<Model2B: id 2, field1 (CharField), field2 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2B: id {}, field1 (CharField), field2 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(objects[1].id))


def test_delete(self):
self.create_model2abcd()

oa = Model2A.objects.get(id=2)
self.assertEqual(repr(oa), '<Model2B: id 2, field1 (CharField), field2 (CharField)>')
oa = Model2A.objects.all()[1]
self.assertEqual(repr(oa), '<Model2B: id {}, field1 (CharField), field2 (CharField)>'.format(oa.id))
self.assertEqual(Model2A.objects.count(), 4)

oa.delete()
objects = Model2A.objects.all()
self.assertEqual(repr(objects[0]), '<Model2A: id 1, field1 (CharField)>')
self.assertEqual(repr(objects[1]), '<Model2C: id 3, field1 (CharField), field2 (CharField), field3 (CharField)>')
self.assertEqual(repr(objects[2]), '<Model2D: id 4, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>')
self.assertEqual(repr(objects[0]), '<Model2A: id {}, field1 (CharField)>'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<Model2C: id {}, field1 (CharField), field2 (CharField), field3 (CharField)>'.format(objects[1].id))
self.assertEqual(repr(objects[2]), '<Model2D: id {}, field1 (CharField), field2 (CharField), field3 (CharField), field4 (CharField)>'.format(objects[2].id))
self.assertEqual(len(objects), 3)


Expand Down Expand Up @@ -658,8 +662,8 @@ def test_user_defined_manager(self):
ModelWithMyManager.objects.create(field1='D1b', field4='D4b')

objects = ModelWithMyManager.objects.all() # MyManager should reverse the sorting of field1
self.assertEqual(repr(objects[0]), '<ModelWithMyManager: id 6, field1 (CharField) "D1b", field4 (CharField) "D4b">')
self.assertEqual(repr(objects[1]), '<ModelWithMyManager: id 5, field1 (CharField) "D1a", field4 (CharField) "D4a">')
self.assertEqual(repr(objects[0]), '<ModelWithMyManager: id {}, field1 (CharField) "D1b", field4 (CharField) "D4b">'.format(objects[0].id))
self.assertEqual(repr(objects[1]), '<ModelWithMyManager: id {}, field1 (CharField) "D1a", field4 (CharField) "D4a">'.format(objects[1].id))
self.assertEqual(len(objects), 2)

self.assertIs(type(ModelWithMyManager.objects), MyManager)
Expand Down Expand Up @@ -766,6 +770,26 @@ def test_fix_getattribute(self):
# __getattribute__ had a problem: "...has no attribute 'sub_and_superclass_dict'"
o = InitTestModelSubclass.objects.create()
self.assertEqual(o.bar, 'XYZ')

def test_create_from_super(self):
# run create test 3 times because initial implementation
# would fail after first success.
for i in range(3):
mc = Model2C.objects.create(field1='C1{}'.format(i),
field2='C2{}'.format(i),
field3='C3{}'.format(i))
mc.save()
field4 = 'D4{}'.format(i)
md = Model2D.objects.create_from_super(mc, field4=field4)
self.assertEqual(mc.id, md.id)
self.assertEqual(mc.field1, md.field1)
self.assertEqual(mc.field2, md.field2)
self.assertEqual(mc.field3, md.field3)
self.assertEqual(md.field4, field4)
ma = Model2A.objects.create(field1='A1e')
self.assertRaises(Exception, Model2D.objects.create_from_super, ma, field4='D4e')
mb = Model2B.objects.create(field1='B1e', field2='B2e')
self.assertRaises(Exception, Model2D.objects.create_from_super, mb, field4='D4e')


class RegressionTests(TestCase):
Expand Down