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from sqlalchemy import *
import testbase
class AttrSettable(object):
def __init__(self, **kwargs):
[setattr(self, k, v) for k, v in kwargs.iteritems()]
def __repr__(self):
return self.__class__.__name__ + ' ' + ','.join(["%s=%s" % (k,v) for k, v in self.__dict__.iteritems() if k[0] != '_'])
class RelationTest1(testbase.PersistTest):
"""test self-referential relationships on polymorphic mappers"""
def setUpAll(self):
global people, managers, metadata
metadata = BoundMetaData(testbase.db)
people = Table('people', metadata,
Column('person_id', Integer, Sequence('person_id_seq', optional=True), primary_key=True),
Column('manager_id', Integer, ForeignKey('managers.person_id', use_alter=True, name="mpid_fq")),
Column('name', String(50)),
Column('type', String(30)))
managers = Table('managers', metadata,
Column('person_id', Integer, ForeignKey('people.person_id'), primary_key=True),
Column('status', String(30)),
Column('manager_name', String(50))
)
metadata.create_all()
def tearDownAll(self):
metadata.drop_all()
def tearDown(self):
clear_mappers()
people.update().execute(manager_id=None)
for t in metadata.table_iterator(reverse=True):
t.delete().execute()
def testbasic(self):
class Person(AttrSettable):
pass
class Manager(Person):
pass
mapper(Person, people, properties={
'manager':relation(Manager, primaryjoin=people.c.manager_id==managers.c.person_id, uselist=False)
})
mapper(Manager, managers, inherits=Person, inherit_condition=people.c.person_id==managers.c.person_id)
try:
compile_mappers()
except exceptions.ArgumentError, ar:
assert str(ar) == "Cant determine relation direction for 'manager' on mapper 'Mapper|Person|people' with primary join 'people.manager_id = managers.person_id' - foreign key columns are present in both the parent and the child's mapped tables. Specify 'foreignkey' argument."
clear_mappers()
mapper(Person, people, properties={
'manager':relation(Manager, primaryjoin=people.c.manager_id==managers.c.person_id, foreignkey=people.c.manager_id, uselist=False, post_update=True)
})
mapper(Manager, managers, inherits=Person, inherit_condition=people.c.person_id==managers.c.person_id)
session = create_session()
p = Person(name='some person')
m = Manager(name='some manager')
p.manager = m
session.save(p)
session.flush()
session.clear()
p = session.query(Person).get(p.person_id)
m = session.query(Manager).get(m.person_id)
print p, m, p.manager
assert p.manager is m
class RelationTest2(testbase.AssertMixin):
"""test self-referential relationships on polymorphic mappers"""
def setUpAll(self):
global people, managers, metadata
metadata = BoundMetaData(testbase.db)
people = Table('people', metadata,
Column('person_id', Integer, Sequence('person_id_seq', optional=True), primary_key=True),
Column('name', String(50)),
Column('type', String(30)))
managers = Table('managers', metadata,
Column('person_id', Integer, ForeignKey('people.person_id'), primary_key=True),
Column('manager_id', Integer, ForeignKey('people.person_id')),
Column('status', String(30)),
)
metadata.create_all()
def tearDownAll(self):
metadata.drop_all()
def tearDown(self):
clear_mappers()
for t in metadata.table_iterator(reverse=True):
t.delete().execute()
def testbasic(self):
class Person(AttrSettable):
pass
class Manager(Person):
pass
poly_union = polymorphic_union({
'person':people.select(people.c.type=='person'),
'manager':managers.join(people, people.c.person_id==managers.c.person_id)
}, None)
mapper(Person, people, select_table=poly_union, polymorphic_identity='person', polymorphic_on=people.c.type)
mapper(Manager, managers, inherits=Person, inherit_condition=people.c.person_id==managers.c.person_id, polymorphic_identity='manager',
properties={
'colleague':relation(Person, primaryjoin=managers.c.manager_id==people.c.person_id, uselist=False)
})
sess = create_session()
p = Person(name='person1')
m = Manager(name='manager1')
m.colleague = p
sess.save(m)
sess.flush()
sess.clear()
p = sess.query(Person).get(p.person_id)
m = sess.query(Manager).get(m.person_id)
print p
print m
assert m.colleague is p
if __name__ == "__main__":
testbase.main()
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