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from testbase import PersistTest, AssertMixin
import unittest
from sqlalchemy import *
import testbase
from sqlalchemy.ext.sessioncontext import SessionContext
from tables import *
import tables
class EntityTest(AssertMixin):
"""tests mappers that are constructed based on "entity names", which allows the same class
to have multiple primary mappers """
def setUpAll(self):
global user1, user2, address1, address2, metadata, ctx
metadata = MetaData(testbase.db)
ctx = SessionContext(create_session)
user1 = Table('user1', metadata,
Column('user_id', Integer, Sequence('user1_id_seq'), primary_key=True),
Column('name', String(60), nullable=False)
)
user2 = Table('user2', metadata,
Column('user_id', Integer, Sequence('user2_id_seq'), primary_key=True),
Column('name', String(60), nullable=False)
)
address1 = Table('address1', metadata,
Column('address_id', Integer, Sequence('address1_id_seq'), primary_key=True),
Column('user_id', Integer, ForeignKey(user1.c.user_id), nullable=False),
Column('email', String(100), nullable=False)
)
address2 = Table('address2', metadata,
Column('address_id', Integer, Sequence('address2_id_seq'), primary_key=True),
Column('user_id', Integer, ForeignKey(user2.c.user_id), nullable=False),
Column('email', String(100), nullable=False)
)
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):
"""tests a pair of one-to-many mapper structures, establishing that both
parent and child objects honor the "entity_name" attribute attached to the object
instances."""
class User(object):pass
class Address(object):pass
a1mapper = mapper(Address, address1, entity_name='address1', extension=ctx.mapper_extension)
a2mapper = mapper(Address, address2, entity_name='address2', extension=ctx.mapper_extension)
u1mapper = mapper(User, user1, entity_name='user1', properties ={
'addresses':relation(a1mapper)
}, extension=ctx.mapper_extension)
u2mapper =mapper(User, user2, entity_name='user2', properties={
'addresses':relation(a2mapper)
}, extension=ctx.mapper_extension)
u1 = User(_sa_entity_name='user1')
u1.name = 'this is user 1'
a1 = Address(_sa_entity_name='address1')
a1.email='a1@foo.com'
u1.addresses.append(a1)
u2 = User(_sa_entity_name='user2')
u2.name='this is user 2'
a2 = Address(_sa_entity_name='address2')
a2.email='a2@foo.com'
u2.addresses.append(a2)
ctx.current.flush()
assert user1.select().execute().fetchall() == [(u1.user_id, u1.name)]
assert user2.select().execute().fetchall() == [(u2.user_id, u2.name)]
assert address1.select().execute().fetchall() == [(u1.user_id, a1.user_id, 'a1@foo.com')]
assert address2.select().execute().fetchall() == [(u2.user_id, a2.user_id, 'a2@foo.com')]
ctx.current.clear()
u1list = ctx.current.query(User, entity_name='user1').select()
u2list = ctx.current.query(User, entity_name='user2').select()
assert len(u1list) == len(u2list) == 1
assert u1list[0] is not u2list[0]
assert len(u1list[0].addresses) == len(u2list[0].addresses) == 1
def testcascade(self):
"""same as testbasic but relies on session cascading"""
class User(object):pass
class Address(object):pass
a1mapper = mapper(Address, address1, entity_name='address1')
a2mapper = mapper(Address, address2, entity_name='address2')
u1mapper = mapper(User, user1, entity_name='user1', properties ={
'addresses':relation(a1mapper)
})
u2mapper =mapper(User, user2, entity_name='user2', properties={
'addresses':relation(a2mapper)
})
sess = create_session()
u1 = User()
u1.name = 'this is user 1'
sess.save(u1, entity_name='user1')
a1 = Address()
a1.email='a1@foo.com'
u1.addresses.append(a1)
u2 = User()
u2.name='this is user 2'
a2 = Address()
a2.email='a2@foo.com'
u2.addresses.append(a2)
sess.save(u2, entity_name='user2')
print u2.__dict__
sess.flush()
assert user1.select().execute().fetchall() == [(u1.user_id, u1.name)]
assert user2.select().execute().fetchall() == [(u2.user_id, u2.name)]
assert address1.select().execute().fetchall() == [(u1.user_id, a1.user_id, 'a1@foo.com')]
assert address2.select().execute().fetchall() == [(u2.user_id, a2.user_id, 'a2@foo.com')]
sess.clear()
u1list = sess.query(User, entity_name='user1').select()
u2list = sess.query(User, entity_name='user2').select()
assert len(u1list) == len(u2list) == 1
assert u1list[0] is not u2list[0]
assert len(u1list[0].addresses) == len(u2list[0].addresses) == 1
def testpolymorphic(self):
"""tests that entity_name can be used to have two kinds of relations on the same class."""
class User(object):pass
class Address1(object):pass
class Address2(object):pass
a1mapper = mapper(Address1, address1, extension=ctx.mapper_extension)
a2mapper = mapper(Address2, address2, extension=ctx.mapper_extension)
u1mapper = mapper(User, user1, entity_name='user1', properties ={
'addresses':relation(a1mapper)
}, extension=ctx.mapper_extension)
u2mapper =mapper(User, user2, entity_name='user2', properties={
'addresses':relation(a2mapper)
}, extension=ctx.mapper_extension)
u1 = User(_sa_entity_name='user1')
u1.name = 'this is user 1'
a1 = Address1()
a1.email='a1@foo.com'
u1.addresses.append(a1)
u2 = User(_sa_entity_name='user2')
u2.name='this is user 2'
a2 = Address2()
a2.email='a2@foo.com'
u2.addresses.append(a2)
ctx.current.flush()
assert user1.select().execute().fetchall() == [(u1.user_id, u1.name)]
assert user2.select().execute().fetchall() == [(u2.user_id, u2.name)]
assert address1.select().execute().fetchall() == [(u1.user_id, a1.user_id, 'a1@foo.com')]
assert address2.select().execute().fetchall() == [(u2.user_id, a2.user_id, 'a2@foo.com')]
ctx.current.clear()
u1list = ctx.current.query(User, entity_name='user1').select()
u2list = ctx.current.query(User, entity_name='user2').select()
assert len(u1list) == len(u2list) == 1
assert u1list[0] is not u2list[0]
assert len(u1list[0].addresses) == len(u2list[0].addresses) == 1
# the lazy load requires that setup_loader() check that the correct LazyLoader
# is setting up for each load
assert isinstance(u1list[0].addresses[0], Address1)
assert isinstance(u2list[0].addresses[0], Address2)
def testpolymorphic_deferred(self):
"""test that deferred columns load properly using entity names"""
class User(object):pass
u1mapper = mapper(User, user1, entity_name='user1', properties ={
'name':deferred(user1.c.name)
}, extension=ctx.mapper_extension)
u2mapper =mapper(User, user2, entity_name='user2', properties={
'name':deferred(user2.c.name)
}, extension=ctx.mapper_extension)
u1 = User(_sa_entity_name='user1')
u1.name = 'this is user 1'
u2 = User(_sa_entity_name='user2')
u2.name='this is user 2'
ctx.current.flush()
assert user1.select().execute().fetchall() == [(u1.user_id, u1.name)]
assert user2.select().execute().fetchall() == [(u2.user_id, u2.name)]
ctx.current.clear()
u1list = ctx.current.query(User, entity_name='user1').select()
u2list = ctx.current.query(User, entity_name='user2').select()
assert len(u1list) == len(u2list) == 1
assert u1list[0] is not u2list[0]
# the deferred column load requires that setup_loader() check that the correct DeferredColumnLoader
# is setting up for each load
assert u1list[0].name == 'this is user 1'
assert u2list[0].name == 'this is user 2'
if __name__ == "__main__":
testbase.main()
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