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|
"""basic tests of lazy loaded attributes"""
from sqlalchemy import select
from sqlalchemy import testing
from sqlalchemy.orm import immediateload
from sqlalchemy.orm import relationship
from sqlalchemy.orm import Session
from sqlalchemy.testing import eq_
from sqlalchemy.testing import is_
from sqlalchemy.testing.fixtures import fixture_session
from test.orm import _fixtures
class ImmediateTest(_fixtures.FixtureTest):
run_inserts = "once"
run_deletes = None
@testing.combinations(
("raise",),
("raise_on_sql",),
("select",),
("immediate"),
)
def test_basic_option(self, default_lazy):
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
self.mapper_registry.map_imperatively(Address, addresses)
self.mapper_registry.map_imperatively(
User,
users,
properties={"addresses": relationship(Address, lazy=default_lazy)},
)
sess = fixture_session()
result = (
sess.query(User)
.options(immediateload(User.addresses))
.filter(users.c.id == 7)
.all()
)
eq_(len(sess.identity_map), 2)
sess.close()
eq_(
[
User(
id=7,
addresses=[Address(id=1, email_address="jack@bean.com")],
)
],
result,
)
@testing.combinations(
("raise",),
("raise_on_sql",),
("select",),
("immediate"),
)
def test_basic_option_m2o(self, default_lazy):
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
self.mapper_registry.map_imperatively(
Address,
addresses,
properties={"user": relationship(User, lazy=default_lazy)},
)
self.mapper_registry.map_imperatively(User, users)
sess = fixture_session()
result = (
sess.query(Address)
.options(immediateload(Address.user))
.filter(Address.id == 1)
.all()
)
eq_(len(sess.identity_map), 2)
sess.close()
eq_(
[Address(id=1, email_address="jack@bean.com", user=User(id=7))],
result,
)
def test_basic(self):
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
self.mapper_registry.map_imperatively(Address, addresses)
self.mapper_registry.map_imperatively(
User,
users,
properties={"addresses": relationship(Address, lazy="immediate")},
)
sess = fixture_session()
result = sess.query(User).filter(users.c.id == 7).all()
eq_(len(sess.identity_map), 2)
sess.close()
eq_(
[
User(
id=7,
addresses=[Address(id=1, email_address="jack@bean.com")],
)
],
result,
)
@testing.combinations(
("joined",),
("selectin",),
("subquery",),
)
def test_m2one_side(self, o2m_lazy):
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
self.mapper_registry.map_imperatively(
Address,
addresses,
properties={
"user": relationship(
User, lazy="immediate", back_populates="addresses"
)
},
)
self.mapper_registry.map_imperatively(
User,
users,
properties={
"addresses": relationship(
Address, lazy=o2m_lazy, back_populates="user"
)
},
)
sess = fixture_session()
u1 = sess.query(User).filter(users.c.id == 7).one()
sess.close()
assert "addresses" in u1.__dict__
assert "user" in u1.addresses[0].__dict__
@testing.combinations(
("immediate",),
("joined",),
("selectin",),
("subquery",),
)
def test_o2mone_side(self, m2o_lazy):
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
self.mapper_registry.map_imperatively(
Address,
addresses,
properties={
"user": relationship(
User, lazy=m2o_lazy, back_populates="addresses"
)
},
)
self.mapper_registry.map_imperatively(
User,
users,
properties={
"addresses": relationship(
Address, lazy="immediate", back_populates="user"
)
},
)
sess = fixture_session()
u1 = sess.query(User).filter(users.c.id == 7).one()
sess.close()
assert "addresses" in u1.__dict__
# current behavior of "immediate" is that subsequent eager loaders
# aren't fired off. This is because the "lazyload" strategy
# does not invoke eager loaders.
assert "user" not in u1.addresses[0].__dict__
class SelfReferentialTest(_fixtures.FixtureTest):
run_inserts = None
run_deletes = "each"
@testing.fixture
def node_fixture(self):
Node = self.classes.Node
nodes = self.tables.nodes
def go(join_depth):
self.mapper_registry.map_imperatively(
Node,
nodes,
properties={
"parent": relationship(
Node,
remote_side=nodes.c.id,
lazy="immediate",
join_depth=join_depth,
)
},
)
return Node
yield go
# 1. the fixture uses InnoDB, so foreign keys are enforced
# 2. "delete from nodes" in InnoDB is not smart enough to delete
# all rows in the correct order automatically
# 3. "DELETE..ORDER BY" is mysql specific. we want the TablesTest
# fixture to be generic
# 4. Can't add "ON DELETE CASCADE" to that fixture because SQL Server
# rejects it
# 5. so until we have a "delete from all tables taking FKs into
# account" routine, we need a custom teardown here for MySQL/MariaDB
# 6. A similar fixture in test_recursive_loaders is cheating since it's
# hardcoding to using MyISAM for MySQL
with Session(testing.db) as sess:
for node in sess.scalars(select(Node)):
sess.delete(node)
sess.commit()
@testing.variation("persistence", ["expunge", "keep", "reload"])
@testing.combinations((None,), (1,), (2,), argnames="join_depth")
def test_self_referential_recursive(
self, persistence, join_depth, node_fixture
):
"""test #10139"""
Node = node_fixture(join_depth)
sess = fixture_session()
n0 = Node(data="n0")
n1 = Node(data="n1")
n2 = Node(data="n2")
n1.parent = n0
n2.parent = n1
sess.add_all([n0, n1, n2])
sess.commit()
if persistence.expunge or persistence.reload:
sess.close()
if persistence.reload:
sess.add(n1)
sess.add(n0)
n2 = sess.query(Node).filter(Node.data == "n2").one()
if persistence.expunge and (join_depth is None or join_depth < 1):
expected_count = 1
else:
expected_count = 0
with self.assert_statement_count(testing.db, expected_count):
if persistence.keep or persistence.reload:
is_(n2.parent, n1)
else:
eq_(n2.parent, Node(data="n1"))
n1 = n2.parent
# ensure n1.parent_id is unexpired
n1.parent_id
if persistence.expunge and (join_depth is None or join_depth < 2):
expected_count = 1
else:
expected_count = 0
with self.assert_statement_count(testing.db, expected_count):
if persistence.keep or persistence.reload:
is_(n1.parent, n0)
else:
eq_(n1.parent, Node(data="n0"))
|
