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test_inheritance.py
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test_inheritance.py
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from __future__ import absolute_import, print_function, division
import unittest
from pony.orm.core import *
from pony.orm.tests.testutils import *
class TestInheritance(unittest.TestCase):
def test_0(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
id = PrimaryKey(int)
self.assertTrue(Entity1._root_ is Entity1)
self.assertEqual(Entity1._discriminator_attr_, None)
self.assertEqual(Entity1._discriminator_, None)
def test_1(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
id = PrimaryKey(int)
class Entity2(Entity1):
a = Required(int)
class Entity3(Entity1):
b = Required(int)
class Entity4(Entity2, Entity3):
c = Required(int)
self.assertTrue(Entity1._root_ is Entity1)
self.assertTrue(Entity2._root_ is Entity1)
self.assertTrue(Entity3._root_ is Entity1)
self.assertTrue(Entity4._root_ is Entity1)
self.assertTrue(Entity1._discriminator_attr_ is Entity1.classtype)
self.assertTrue(Entity2._discriminator_attr_ is Entity1._discriminator_attr_)
self.assertTrue(Entity3._discriminator_attr_ is Entity1._discriminator_attr_)
self.assertTrue(Entity4._discriminator_attr_ is Entity1._discriminator_attr_)
self.assertEqual(Entity1._discriminator_, 'Entity1')
self.assertEqual(Entity2._discriminator_, 'Entity2')
self.assertEqual(Entity3._discriminator_, 'Entity3')
self.assertEqual(Entity4._discriminator_, 'Entity4')
@raises_exception(ERDiagramError, "Multiple inheritance graph must be diamond-like. "
"Entity Entity3 inherits from Entity1 and Entity2 entities which don't have common base class.")
def test_2(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
a = PrimaryKey(int)
class Entity2(db.Entity):
b = PrimaryKey(int)
class Entity3(Entity1, Entity2):
c = Required(int)
@raises_exception(ERDiagramError, 'Attribute Entity3.a conflicts with attribute Entity2.a '
'because both entities inherit from Entity1. '
'To fix this, move attribute definition to base class')
def test_3a(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
id = PrimaryKey(int)
class Entity2(Entity1):
a = Required(int)
class Entity3(Entity1):
a = Required(int)
def test3b(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
id = PrimaryKey(int)
class Entity2(Entity1):
a = Set('Entity4')
class Entity3(Entity1):
a = Set('Entity4')
class Entity4(db.Entity):
x = Required(Entity2)
y = Required(Entity3)
db.generate_mapping(create_tables=True)
self.assertTrue(Entity2.a not in Entity1._subclass_attrs_)
self.assertTrue(Entity3.a not in Entity1._subclass_attrs_)
@raises_exception(ERDiagramError, "Name 'a' hides base attribute Entity1.a")
def test_4(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
id = PrimaryKey(int)
a = Required(int)
class Entity2(Entity1):
a = Required(int)
@raises_exception(ERDiagramError, "Primary key cannot be redefined in derived classes")
def test_5(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
a = PrimaryKey(int)
class Entity2(Entity1):
b = PrimaryKey(int)
def test_6(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
a = Discriminator(str)
b = Required(int)
class Entity2(Entity1):
c = Required(int)
self.assertTrue(Entity1._discriminator_attr_ is Entity1.a)
self.assertTrue(Entity2._discriminator_attr_ is Entity1.a)
@raises_exception(TypeError, "Discriminator value for entity Entity1 "
"with custom discriminator column 'a' of 'int' type is not set")
def test_7(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
a = Discriminator(int)
b = Required(int)
class Entity2(Entity1):
c = Required(int)
def test_8(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
_discriminator_ = 1
a = Discriminator(int)
b = Required(int)
class Entity2(Entity1):
_discriminator_ = 2
c = Required(int)
db.generate_mapping(create_tables=True)
with db_session:
x = Entity1(b=10)
y = Entity2(b=10, c=20)
with db_session:
x = Entity1[1]
y = Entity1[2]
self.assertTrue(isinstance(x, Entity1))
self.assertTrue(isinstance(y, Entity2))
self.assertEqual(x.a, 1)
self.assertEqual(y.a, 2)
def test_9(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
_discriminator_ = '1'
a = Discriminator(int)
b = Required(int)
class Entity2(Entity1):
_discriminator_ = '2'
c = Required(int)
db.generate_mapping(create_tables=True)
with db_session:
x = Entity1(b=10)
y = Entity2(b=10, c=20)
with db_session:
x = Entity1[1]
y = Entity1[2]
self.assertTrue(isinstance(x, Entity1))
self.assertTrue(isinstance(y, Entity2))
self.assertEqual(x.a, 1)
self.assertEqual(y.a, 2)
@raises_exception(TypeError, "Incorrect discriminator value is set for Entity2 attribute 'a' of 'int' type: 'zzz'")
def test_10(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
_discriminator_ = 1
a = Discriminator(int)
b = Required(int)
class Entity2(Entity1):
_discriminator_ = 'zzz'
c = Required(int)
def test_11(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
_discriminator_ = 1
a = Discriminator(int)
b = Required(int)
composite_index(a, b)
@raises_exception(ERDiagramError, 'Invalid use of attribute Entity1.a in entity Entity2')
def test_12(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
a = Required(int)
class Entity2(db.Entity):
b = Required(int)
composite_index(Entity1.a, b)
def test_13(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
a = Required(int)
class Entity2(Entity1):
b = Required(int)
composite_index(Entity1.a, b)
self.assertEqual([ index.attrs for index in Entity2._indexes_ ],
[ (Entity2.id,), (Entity2.a, Entity2.b) ])
def test_14(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
d = Discriminator(str)
a = Required(int)
class Entity2(Entity1):
b = Required(int)
composite_index(Entity1.d, Entity1.a, b)
self.assertEqual([ index.attrs for index in Entity2._indexes_ ],
[ (Entity2.id,), (Entity2.d, Entity2.a, Entity2.b) ])
def test_15(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
d = Discriminator(str)
a = Required(int)
class Entity2(Entity1):
b = Required(int)
composite_index('d', 'id', 'a', 'b')
self.assertEqual([ index.attrs for index in Entity2._indexes_ ],
[ (Entity2.id,), (Entity2.d, Entity2.id, Entity2.a, Entity2.b) ])
def test_16(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
a = Required(int)
class Entity2(Entity1):
b = Required(int)
composite_index('classtype', 'id', 'a', b)
self.assertEqual([ index.attrs for index in Entity2._indexes_ ],
[ (Entity2.id,), (Entity2.classtype, Entity2.id, Entity2.a, Entity2.b) ])
def test_17(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
t = Discriminator(str)
a = Required(int)
b = Required(int)
composite_index(t, a, b)
class Entity2(Entity1):
c = Required(int)
self.assertEqual([ index.attrs for index in Entity1._indexes_ ],
[ (Entity1.id,), (Entity1.t, Entity1.a, Entity1.b) ])
def test_18(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
a = Required(int)
class Entity2(db.Entity1):
b = Required(int)
class Entity3(Entity1):
c = Required(int)
db.generate_mapping(create_tables=True)
with db_session:
x = Entity1(a=10)
y = Entity2(a=20, b=30)
z = Entity3(a=40, c=50)
with db_session:
result = select(e for e in Entity1 if e.b == 30 or e.c == 50)
self.assertEqual([ e.id for e in result ], [ 2, 3 ])
def test_discriminator_1(self):
db = Database('sqlite', ':memory:')
class Entity1(db.Entity):
a = Discriminator(str)
b = Required(int)
PrimaryKey(a, b)
class Entity2(db.Entity1):
c = Required(int)
db.generate_mapping(create_tables=True)
with db_session:
x = Entity1(b=10)
y = Entity2(b=20, c=30)
with db_session:
obj = Entity1.get(b=20)
self.assertEqual(obj.a, 'Entity2')
self.assertEqual(obj.b, 20)
self.assertEqual(obj._pkval_, ('Entity2', 20))
with db_session:
obj = Entity1['Entity2', 20]
self.assertEqual(obj.a, 'Entity2')
self.assertEqual(obj.b, 20)
self.assertEqual(obj._pkval_, ('Entity2', 20))
if __name__ == '__main__':
unittest.main()