PublicArchive/sqlalchemy
2
0
Fork 0
mirror of https://github.com/sqlalchemy/sqlalchemy.git synced 2026-05-27 19:15:05 -04:00
Code Issues Packages Projects Releases Wiki Activity
Files
e418d75853e9304615e85ea5110efdb0bb06d13b
sqlalchemy/test/orm/test_subquery_relations.py
T
Mike Bayer 3e22b7655a Remove ORDER BY pk from subqueryload, selectinload 
Modified the queries used by subqueryload and selectinload to no longer
ORDER BY the primary key of the parent entity;  this ordering was there to
allow the rows as they come in to be copied into lists directly with a
minimal level of Python-side collation.   However, these ORDER BY clauses
can negatively impact the performance of the query as in many scenarios
these columns are derived from a subquery or are otherwise not actual
primary key columns such that SQL planners cannot make use of indexes. The
Python-side collation uses the native itertools.group_by() to collate the
incoming rows, and has been modified to allow multiple
row-groups-per-parent to be assembled together using list.extend(), which
should still allow for relatively fast Python-side performance.  There will
still be an ORDER BY present for a relationship that includes an explicit
order_by parameter, however this is the only ORDER BY that will be added to
the query for both kinds of loading.

Fixes: #5162
Change-Id: I8befd1303c1af7cc24cbf005f39bc01c8b2745f3
(cherry picked from commit f86ee556add28afd4de31c10fce56b00a0014a4e)
2020-03-30 11:44:07 -04:00

3170 lines
96 KiB
Python
Raw Blame History

import sqlalchemy as sa
from sqlalchemy import bindparam
from sqlalchemy import ForeignKey
from sqlalchemy import inspect
from sqlalchemy import Integer
from sqlalchemy import literal_column
from sqlalchemy import select
from sqlalchemy import String
from sqlalchemy import testing
from sqlalchemy.orm import aliased
from sqlalchemy.orm import clear_mappers
from sqlalchemy.orm import close_all_sessions
from sqlalchemy.orm import create_session
from sqlalchemy.orm import deferred
from sqlalchemy.orm import joinedload
from sqlalchemy.orm import mapper
from sqlalchemy.orm import relationship
from sqlalchemy.orm import Session
from sqlalchemy.orm import subqueryload
from sqlalchemy.orm import undefer
from sqlalchemy.orm import with_polymorphic
from sqlalchemy.testing import assert_raises
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.testing import eq_
from sqlalchemy.testing import fixtures
from sqlalchemy.testing import is_
from sqlalchemy.testing import is_not_
from sqlalchemy.testing import is_true
from sqlalchemy.testing.assertsql import CompiledSQL
from sqlalchemy.testing.entities import ComparableEntity
from sqlalchemy.testing.schema import Column
from sqlalchemy.testing.schema import Table
from test.orm import _fixtures
from .inheritance._poly_fixtures import _Polymorphic
from .inheritance._poly_fixtures import Company
from .inheritance._poly_fixtures import Engineer
from .inheritance._poly_fixtures import Machine
from .inheritance._poly_fixtures import MachineType
from .inheritance._poly_fixtures import Page
from .inheritance._poly_fixtures import Paperwork
from .inheritance._poly_fixtures import Person
class EagerTest(_fixtures.FixtureTest, testing.AssertsCompiledSQL):
run_inserts = "once"
run_deletes = None
def test_basic(self):
users, Address, addresses, User = (
self.tables.users,
self.classes.Address,
self.tables.addresses,
self.classes.User,
)
mapper(
User,
users,
properties={
"addresses": relationship(
mapper(Address, addresses), order_by=Address.id
)
},
)
sess = create_session()
q = sess.query(User).options(subqueryload(User.addresses))
def go():
eq_(
[
User(
id=7,
addresses=[
Address(id=1, email_address="jack@bean.com")
],
)
],
q.filter(User.id == 7).all(),
)
self.assert_sql_count(testing.db, go, 2)
def go():
eq_(self.static.user_address_result, q.order_by(User.id).all())
self.assert_sql_count(testing.db, go, 2)
def test_from_aliased(self):
users, Dingaling, User, dingalings, Address, addresses = (
self.tables.users,
self.classes.Dingaling,
self.classes.User,
self.tables.dingalings,
self.classes.Address,
self.tables.addresses,
)
mapper(Dingaling, dingalings)
mapper(
Address,
addresses,
properties={
"dingalings": relationship(Dingaling, order_by=Dingaling.id)
},
)
mapper(
User,
users,
properties={
"addresses": relationship(Address, order_by=Address.id)
},
)
sess = create_session()
u = aliased(User)
q = sess.query(u).options(subqueryload(u.addresses))
def go():
eq_(
[
User(
id=7,
addresses=[
Address(id=1, email_address="jack@bean.com")
],
)
],
q.filter(u.id == 7).all(),
)
self.assert_sql_count(testing.db, go, 2)
def go():
eq_(self.static.user_address_result, q.order_by(u.id).all())
self.assert_sql_count(testing.db, go, 2)
q = sess.query(u).options(
subqueryload(u.addresses).subqueryload(Address.dingalings)
)
def go():
eq_(
[
User(
id=8,
addresses=[
Address(
id=2,
email_address="ed@wood.com",
dingalings=[Dingaling()],
),
Address(id=3, email_address="ed@bettyboop.com"),
Address(id=4, email_address="ed@lala.com"),
],
),
User(
id=9,
addresses=[Address(id=5, dingalings=[Dingaling()])],
),
],
q.filter(u.id.in_([8, 9])).all(),
)
self.assert_sql_count(testing.db, go, 3)
def test_from_get(self):
users, Address, addresses, User = (
self.tables.users,
self.classes.Address,
self.tables.addresses,
self.classes.User,
)
mapper(
User,
users,
properties={
"addresses": relationship(
mapper(Address, addresses), order_by=Address.id
)
},
)
sess = create_session()
q = sess.query(User).options(subqueryload(User.addresses))
def go():
eq_(
User(
id=7,
addresses=[Address(id=1, email_address="jack@bean.com")],
),
q.get(7),
)
self.assert_sql_count(testing.db, go, 2)
def test_from_params(self):
users, Address, addresses, User = (
self.tables.users,
self.classes.Address,
self.tables.addresses,
self.classes.User,
)
mapper(
User,
users,
properties={
"addresses": relationship(
mapper(Address, addresses), order_by=Address.id
)
},
)
sess = create_session()
q = sess.query(User).options(subqueryload(User.addresses))
def go():
eq_(
User(
id=7,
addresses=[Address(id=1, email_address="jack@bean.com")],
),
q.filter(User.id == bindparam("foo")).params(foo=7).one(),
)
self.assert_sql_count(testing.db, go, 2)
def test_disable_dynamic(self):
"""test no subquery option on a dynamic."""
users, Address, addresses, User = (
self.tables.users,
self.classes.Address,
self.tables.addresses,
self.classes.User,
)
mapper(
User,
users,
properties={"addresses": relationship(Address, lazy="dynamic")},
)
mapper(Address, addresses)
sess = create_session()
# previously this would not raise, but would emit
# the query needlessly and put the result nowhere.
assert_raises_message(
sa.exc.InvalidRequestError,
"User.addresses' does not support object population - eager "
"loading cannot be applied.",
sess.query(User).options(subqueryload(User.addresses)).first,
)
def test_many_to_many_plain(self):
keywords, items, item_keywords, Keyword, Item = (
self.tables.keywords,
self.tables.items,
self.tables.item_keywords,
self.classes.Keyword,
self.classes.Item,
)
mapper(Keyword, keywords)
mapper(
Item,
items,
properties=dict(
keywords=relationship(
Keyword,
secondary=item_keywords,
lazy="subquery",
order_by=keywords.c.id,
)
),
)
q = create_session().query(Item).order_by(Item.id)
def go():
eq_(self.static.item_keyword_result, q.all())
self.assert_sql_count(testing.db, go, 2)
def test_many_to_many_with_join(self):
keywords, items, item_keywords, Keyword, Item = (
self.tables.keywords,
self.tables.items,
self.tables.item_keywords,
self.classes.Keyword,
self.classes.Item,
)
mapper(Keyword, keywords)
mapper(
Item,
items,
properties=dict(
keywords=relationship(
Keyword,
secondary=item_keywords,
lazy="subquery",
order_by=keywords.c.id,
)
),
)
q = create_session().query(Item).order_by(Item.id)
def go():
eq_(
self.static.item_keyword_result[0:2],
q.join("keywords").filter(Keyword.name == "red").all(),
)
self.assert_sql_count(testing.db, go, 2)
def test_many_to_many_with_join_alias(self):
keywords, items, item_keywords, Keyword, Item = (
self.tables.keywords,
self.tables.items,
self.tables.item_keywords,
self.classes.Keyword,
self.classes.Item,
)
mapper(Keyword, keywords)
mapper(
Item,
items,
properties=dict(
keywords=relationship(
Keyword,
secondary=item_keywords,
lazy="subquery",
order_by=keywords.c.id,
)
),
)
q = create_session().query(Item).order_by(Item.id)
def go():
eq_(
self.static.item_keyword_result[0:2],
(
q.join("keywords", aliased=True).filter(
Keyword.name == "red"
)
).all(),
)
self.assert_sql_count(testing.db, go, 2)
def test_orderby(self):
users, Address, addresses, User = (
self.tables.users,
self.classes.Address,
self.tables.addresses,
self.classes.User,
)
mapper(
User,
users,
properties={
"addresses": relationship(
mapper(Address, addresses),
lazy="subquery",
order_by=addresses.c.email_address,
)
},
)
q = create_session().query(User)
eq_(
[
User(id=7, addresses=[Address(id=1)]),
User(
id=8,
addresses=[
Address(id=3, email_address="ed@bettyboop.com"),
Address(id=4, email_address="ed@lala.com"),
Address(id=2, email_address="ed@wood.com"),
],
),
User(id=9, addresses=[Address(id=5)]),
User(id=10, addresses=[]),
],
q.order_by(User.id).all(),
)
def test_orderby_multi(self):
users, Address, addresses, User = (
self.tables.users,
self.classes.Address,
self.tables.addresses,
self.classes.User,
)
mapper(
User,
users,
properties={
"addresses": relationship(
mapper(Address, addresses),
lazy="subquery",
order_by=[addresses.c.email_address, addresses.c.id],
)
},
)
q = create_session().query(User)
eq_(
[
User(id=7, addresses=[Address(id=1)]),
User(
id=8,
addresses=[
Address(id=3, email_address="ed@bettyboop.com"),
Address(id=4, email_address="ed@lala.com"),
Address(id=2, email_address="ed@wood.com"),
],
),
User(id=9, addresses=[Address(id=5)]),
User(id=10, addresses=[]),
],
q.order_by(User.id).all(),
)
def test_orderby_related(self):
"""A regular mapper select on a single table can
order by a relationship to a second table"""
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
mapper(Address, addresses)
mapper(
User,
users,
properties=dict(
addresses=relationship(
Address, lazy="subquery", order_by=addresses.c.id
)
),
)
q = create_session().query(User)
result = (
q.filter(User.id == Address.user_id)
.order_by(Address.email_address)
.all()
)
eq_(
[
User(
id=8,
addresses=[
Address(id=2, email_address="ed@wood.com"),
Address(id=3, email_address="ed@bettyboop.com"),
Address(id=4, email_address="ed@lala.com"),
],
),
User(id=9, addresses=[Address(id=5)]),
User(id=7, addresses=[Address(id=1)]),
],
result,
)
def test_orderby_desc(self):
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
mapper(Address, addresses)
mapper(
User,
users,
properties=dict(
addresses=relationship(
Address,
lazy="subquery",
order_by=[sa.desc(addresses.c.email_address)],
)
),
)
sess = create_session()
eq_(
[
User(id=7, addresses=[Address(id=1)]),
User(
id=8,
addresses=[
Address(id=2, email_address="ed@wood.com"),
Address(id=4, email_address="ed@lala.com"),
Address(id=3, email_address="ed@bettyboop.com"),
],
),
User(id=9, addresses=[Address(id=5)]),
User(id=10, addresses=[]),
],
sess.query(User).order_by(User.id).all(),
)
_pathing_runs = [
("lazyload", "lazyload", "lazyload", 15),
("subqueryload", "lazyload", "lazyload", 12),
("subqueryload", "subqueryload", "lazyload", 8),
("joinedload", "subqueryload", "lazyload", 7),
("lazyload", "lazyload", "subqueryload", 12),
("subqueryload", "subqueryload", "subqueryload", 4),
("subqueryload", "subqueryload", "joinedload", 3),
]
def test_options_pathing(self):
self._do_options_test(self._pathing_runs)
def test_mapper_pathing(self):
self._do_mapper_test(self._pathing_runs)
def _do_options_test(self, configs):
(
users,
Keyword,
orders,
items,
order_items,
Order,
Item,
User,
keywords,
item_keywords,
) = (
self.tables.users,
self.classes.Keyword,
self.tables.orders,
self.tables.items,
self.tables.order_items,
self.classes.Order,
self.classes.Item,
self.classes.User,
self.tables.keywords,
self.tables.item_keywords,
)
mapper(
User,
users,
properties={
"orders": relationship(Order, order_by=orders.c.id) # o2m, m2o
},
)
mapper(
Order,
orders,
properties={
"items": relationship(
Item, secondary=order_items, order_by=items.c.id
) # m2m
},
)
mapper(
Item,
items,
properties={
"keywords": relationship(
Keyword, secondary=item_keywords, order_by=keywords.c.id
) # m2m
},
)
mapper(Keyword, keywords)
callables = {"joinedload": joinedload, "subqueryload": subqueryload}
for o, i, k, count in configs:
options = []
if o in callables:
options.append(callables[o](User.orders))
if i in callables:
options.append(callables[i](User.orders, Order.items))
if k in callables:
options.append(
callables[k](User.orders, Order.items, Item.keywords)
)
self._do_query_tests(options, count)
def _do_mapper_test(self, configs):
(
users,
Keyword,
orders,
items,
order_items,
Order,
Item,
User,
keywords,
item_keywords,
) = (
self.tables.users,
self.classes.Keyword,
self.tables.orders,
self.tables.items,
self.tables.order_items,
self.classes.Order,
self.classes.Item,
self.classes.User,
self.tables.keywords,
self.tables.item_keywords,
)
opts = {
"lazyload": "select",
"joinedload": "joined",
"subqueryload": "subquery",
}
for o, i, k, count in configs:
mapper(
User,
users,
properties={
"orders": relationship(
Order, lazy=opts[o], order_by=orders.c.id
)
},
)
mapper(
Order,
orders,
properties={
"items": relationship(
Item,
secondary=order_items,
lazy=opts[i],
order_by=items.c.id,
)
},
)
mapper(
Item,
items,
properties={
"keywords": relationship(
Keyword,
lazy=opts[k],
secondary=item_keywords,
order_by=keywords.c.id,
)
},
)
mapper(Keyword, keywords)
try:
self._do_query_tests([], count)
finally:
clear_mappers()
def _do_query_tests(self, opts, count):
Order, User = self.classes.Order, self.classes.User
sess = create_session()
def go():
eq_(
sess.query(User).options(*opts).order_by(User.id).all(),
self.static.user_item_keyword_result,
)
self.assert_sql_count(testing.db, go, count)
eq_(
sess.query(User)
.options(*opts)
.filter(User.name == "fred")
.order_by(User.id)
.all(),
self.static.user_item_keyword_result[2:3],
)
sess = create_session()
eq_(
sess.query(User)
.options(*opts)
.join(User.orders)
.filter(Order.id == 3)
.order_by(User.id)
.all(),
self.static.user_item_keyword_result[0:1],
)
def test_cyclical(self):
"""A circular eager relationship breaks the cycle with a lazy loader"""
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
mapper(Address, addresses)
mapper(
User,
users,
properties=dict(
addresses=relationship(
Address,
lazy="subquery",
backref=sa.orm.backref("user", lazy="subquery"),
order_by=Address.id,
)
),
)
is_(
sa.orm.class_mapper(User).get_property("addresses").lazy,
"subquery",
)
is_(sa.orm.class_mapper(Address).get_property("user").lazy, "subquery")
sess = create_session()
eq_(
self.static.user_address_result,
sess.query(User).order_by(User.id).all(),
)
def test_cyclical_explicit_join_depth(self):
"""A circular eager relationship breaks the cycle with a lazy loader"""
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
mapper(Address, addresses)
mapper(
User,
users,
properties=dict(
addresses=relationship(
Address,
lazy="subquery",
join_depth=1,
backref=sa.orm.backref(
"user", lazy="subquery", join_depth=1
),
order_by=Address.id,
)
),
)
is_(
sa.orm.class_mapper(User).get_property("addresses").lazy,
"subquery",
)
is_(sa.orm.class_mapper(Address).get_property("user").lazy, "subquery")
sess = create_session()
eq_(
self.static.user_address_result,
sess.query(User).order_by(User.id).all(),
)
def test_add_arbitrary_exprs(self):
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
mapper(Address, addresses)
mapper(
User,
users,
properties=dict(addresses=relationship(Address, lazy="subquery")),
)
sess = create_session()
self.assert_compile(
sess.query(User, literal_column("1")),
"SELECT users.id AS users_id, users.name AS users_name, "
"1 FROM users",
)
def test_double_w_ac_against_subquery(self):
(
users,
orders,
User,
Address,
Order,
addresses,
Item,
items,
order_items,
) = (
self.tables.users,
self.tables.orders,
self.classes.User,
self.classes.Address,
self.classes.Order,
self.tables.addresses,
self.classes.Item,
self.tables.items,
self.tables.order_items,
)
mapper(Address, addresses)
mapper(
Order,
orders,
properties={
"items": relationship(
Item,
secondary=order_items,
lazy="subquery",
order_by=items.c.id,
)
},
)
mapper(Item, items)
open_mapper = aliased(
Order, select([orders]).where(orders.c.isopen == 1).alias()
)
closed_mapper = aliased(
Order, select([orders]).where(orders.c.isopen == 0).alias()
)
mapper(
User,
users,
properties=dict(
addresses=relationship(
Address, lazy="subquery", order_by=addresses.c.id
),
open_orders=relationship(
open_mapper, lazy="subquery", order_by=open_mapper.id
),
closed_orders=relationship(
closed_mapper, lazy="subquery", order_by=closed_mapper.id
),
),
)
self._run_double_test()
def test_double_w_ac(self):
(
users,
orders,
User,
Address,
Order,
addresses,
Item,
items,
order_items,
) = (
self.tables.users,
self.tables.orders,
self.classes.User,
self.classes.Address,
self.classes.Order,
self.tables.addresses,
self.classes.Item,
self.tables.items,
self.tables.order_items,
)
mapper(Address, addresses)
mapper(
Order,
orders,
properties={
"items": relationship(
Item,
secondary=order_items,
lazy="subquery",
order_by=items.c.id,
)
},
)
mapper(Item, items)
open_mapper = aliased(Order, orders)
closed_mapper = aliased(Order, orders)
mapper(
User,
users,
properties=dict(
addresses=relationship(
Address, lazy="subquery", order_by=addresses.c.id
),
open_orders=relationship(
open_mapper,
primaryjoin=sa.and_(
open_mapper.isopen == 1,
users.c.id == open_mapper.user_id,
),
lazy="subquery",
order_by=open_mapper.id,
),
closed_orders=relationship(
closed_mapper,
primaryjoin=sa.and_(
closed_mapper.isopen == 0,
users.c.id == closed_mapper.user_id,
),
lazy="subquery",
order_by=closed_mapper.id,
),
),
)
self._run_double_test()
def test_double_same_mappers(self):
"""Eager loading with two relationships simultaneously,
from the same table, using aliases."""
(
addresses,
items,
order_items,
orders,
Item,
User,
Address,
Order,
users,
) = (
self.tables.addresses,
self.tables.items,
self.tables.order_items,
self.tables.orders,
self.classes.Item,
self.classes.User,
self.classes.Address,
self.classes.Order,
self.tables.users,
)
mapper(Address, addresses)
mapper(
Order,
orders,
properties={
"items": relationship(
Item,
secondary=order_items,
lazy="subquery",
order_by=items.c.id,
)
},
)
mapper(Item, items)
mapper(
User,
users,
properties=dict(
addresses=relationship(
Address, lazy="subquery", order_by=addresses.c.id
),
open_orders=relationship(
Order,
primaryjoin=sa.and_(
orders.c.isopen == 1, users.c.id == orders.c.user_id
),
lazy="subquery",
order_by=orders.c.id,
),
closed_orders=relationship(
Order,
primaryjoin=sa.and_(
orders.c.isopen == 0, users.c.id == orders.c.user_id
),
lazy="subquery",
order_by=orders.c.id,
),
),
)
self._run_double_test()
def _run_double_test(self, no_items=False):
User, Address, Order, Item = self.classes(
"User", "Address", "Order", "Item"
)
q = create_session().query(User).order_by(User.id)
def items(*ids):
if no_items:
return {}
else:
return {"items": [Item(id=id_) for id_ in ids]}
def go():
eq_(
[
User(
id=7,
addresses=[Address(id=1)],
open_orders=[Order(id=3, **items(3, 4, 5))],
closed_orders=[
Order(id=1, **items(1, 2, 3)),
Order(id=5, **items(5)),
],
),
User(
id=8,
addresses=[
Address(id=2),
Address(id=3),
Address(id=4),
],
open_orders=[],
closed_orders=[],
),
User(
id=9,
addresses=[Address(id=5)],
open_orders=[Order(id=4, **items(1, 5))],
closed_orders=[Order(id=2, **items(1, 2, 3))],
),
User(id=10),
],
q.all(),
)
if no_items:
self.assert_sql_count(testing.db, go, 4)
else:
self.assert_sql_count(testing.db, go, 6)
def test_limit(self):
"""Limit operations combined with lazy-load relationships."""
(
users,
items,
order_items,
orders,
Item,
User,
Address,
Order,
addresses,
) = (
self.tables.users,
self.tables.items,
self.tables.order_items,
self.tables.orders,
self.classes.Item,
self.classes.User,
self.classes.Address,
self.classes.Order,
self.tables.addresses,
)
mapper(Item, items)
mapper(
Order,
orders,
properties={
"items": relationship(
Item,
secondary=order_items,
lazy="subquery",
order_by=items.c.id,
)
},
)
mapper(
User,
users,
properties={
"addresses": relationship(
mapper(Address, addresses),
lazy="subquery",
order_by=addresses.c.id,
),
"orders": relationship(
Order, lazy="select", order_by=orders.c.id
),
},
)
sess = create_session()
q = sess.query(User)
result = q.order_by(User.id).limit(2).offset(1).all()
eq_(self.static.user_all_result[1:3], result)
result = q.order_by(sa.desc(User.id)).limit(2).offset(2).all()
eq_(list(reversed(self.static.user_all_result[0:2])), result)
def test_group_by_only(self):
# test group_by() not impacting results, similarly to joinedload
users, Address, addresses, User = (
self.tables.users,
self.classes.Address,
self.tables.addresses,
self.classes.User,
)
mapper(
User,
users,
properties={
"addresses": relationship(
mapper(Address, addresses),
lazy="subquery",
order_by=addresses.c.email_address,
)
},
)
q = create_session().query(User)
eq_(
[
User(id=7, addresses=[Address(id=1)]),
User(
id=8,
addresses=[
Address(id=3, email_address="ed@bettyboop.com"),
Address(id=4, email_address="ed@lala.com"),
Address(id=2, email_address="ed@wood.com"),
],
),
User(id=9, addresses=[Address(id=5)]),
User(id=10, addresses=[]),
],
q.order_by(User.id).group_by(User).all(), # group by all columns
)
def test_one_to_many_scalar(self):
Address, addresses, users, User = (
self.classes.Address,
self.tables.addresses,
self.tables.users,
self.classes.User,
)
mapper(
User,
users,
properties=dict(
address=relationship(
mapper(Address, addresses), lazy="subquery", uselist=False
)
),
)
q = create_session().query(User)
def go():
result = q.filter(users.c.id == 7).all()
eq_([User(id=7, address=Address(id=1))], result)
self.assert_sql_count(testing.db, go, 2)
def test_many_to_one(self):
users, Address, addresses, User = (
self.tables.users,
self.classes.Address,
self.tables.addresses,
self.classes.User,
)
mapper(
Address,
addresses,
properties=dict(
user=relationship(mapper(User, users), lazy="subquery")
),
)
sess = create_session()
q = sess.query(Address)
def go():
a = q.filter(addresses.c.id == 1).one()
is_not_(a.user, None)
u1 = sess.query(User).get(7)
is_(a.user, u1)
self.assert_sql_count(testing.db, go, 2)
def test_double_with_aggregate(self):
User, users, orders, Order = (
self.classes.User,
self.tables.users,
self.tables.orders,
self.classes.Order,
)
max_orders_by_user = sa.select(
[sa.func.max(orders.c.id).label("order_id")],
group_by=[orders.c.user_id],
).alias("max_orders_by_user")
max_orders = orders.select(
orders.c.id == max_orders_by_user.c.order_id
).alias("max_orders")
mapper(Order, orders)
mapper(
User,
users,
properties={
"orders": relationship(
Order,
backref="user",
lazy="subquery",
order_by=orders.c.id,
),
"max_order": relationship(
aliased(Order, max_orders), lazy="subquery", uselist=False
),
},
)
q = create_session().query(User)
def go():
eq_(
[
User(
id=7,
orders=[Order(id=1), Order(id=3), Order(id=5)],
max_order=Order(id=5),
),
User(id=8, orders=[]),
User(
id=9,
orders=[Order(id=2), Order(id=4)],
max_order=Order(id=4),
),
User(id=10),
],
q.order_by(User.id).all(),
)
self.assert_sql_count(testing.db, go, 3)
def test_uselist_false_warning(self):
"""test that multiple rows received by a
uselist=False raises a warning."""
User, users, orders, Order = (
self.classes.User,
self.tables.users,
self.tables.orders,
self.classes.Order,
)
mapper(
User,
users,
properties={"order": relationship(Order, uselist=False)},
)
mapper(Order, orders)
s = create_session()
assert_raises(
sa.exc.SAWarning,
s.query(User).options(subqueryload(User.order)).all,
)
class LoadOnExistingTest(_fixtures.FixtureTest):
"""test that loaders from a base Query fully populate."""
run_inserts = "once"
run_deletes = None
def _collection_to_scalar_fixture(self):
User, Address, Dingaling = (
self.classes.User,
self.classes.Address,
self.classes.Dingaling,
)
mapper(
User,
self.tables.users,
properties={"addresses": relationship(Address)},
)
mapper(
Address,
self.tables.addresses,
properties={"dingaling": relationship(Dingaling)},
)
mapper(Dingaling, self.tables.dingalings)
sess = Session(autoflush=False)
return User, Address, Dingaling, sess
def _collection_to_collection_fixture(self):
User, Order, Item = (
self.classes.User,
self.classes.Order,
self.classes.Item,
)
mapper(
User, self.tables.users, properties={"orders": relationship(Order)}
)
mapper(
Order,
self.tables.orders,
properties={
"items": relationship(Item, secondary=self.tables.order_items)
},
)
mapper(Item, self.tables.items)
sess = Session(autoflush=False)
return User, Order, Item, sess
def _eager_config_fixture(self):
User, Address = self.classes.User, self.classes.Address
mapper(
User,
self.tables.users,
properties={"addresses": relationship(Address, lazy="subquery")},
)
mapper(Address, self.tables.addresses)
sess = Session(autoflush=False)
return User, Address, sess
def _deferred_config_fixture(self):
User, Address = self.classes.User, self.classes.Address
mapper(
User,
self.tables.users,
properties={
"name": deferred(self.tables.users.c.name),
"addresses": relationship(Address, lazy="subquery"),
},
)
mapper(Address, self.tables.addresses)
sess = Session(autoflush=False)
return User, Address, sess
def test_no_query_on_refresh(self):
User, Address, sess = self._eager_config_fixture()
u1 = sess.query(User).get(8)
assert "addresses" in u1.__dict__
sess.expire(u1)
def go():
eq_(u1.id, 8)
self.assert_sql_count(testing.db, go, 1)
assert "addresses" not in u1.__dict__
def test_no_query_on_deferred(self):
User, Address, sess = self._deferred_config_fixture()
u1 = sess.query(User).get(8)
assert "addresses" in u1.__dict__
sess.expire(u1, ["addresses"])
def go():
eq_(u1.name, "ed")
self.assert_sql_count(testing.db, go, 1)
assert "addresses" not in u1.__dict__
def test_populate_existing_propagate(self):
User, Address, sess = self._eager_config_fixture()
u1 = sess.query(User).get(8)
u1.addresses[2].email_address = "foofoo"
del u1.addresses[1]
u1 = sess.query(User).populate_existing().filter_by(id=8).one()
# collection is reverted
eq_(len(u1.addresses), 3)
# attributes on related items reverted
eq_(u1.addresses[2].email_address, "ed@lala.com")
def test_loads_second_level_collection_to_scalar(self):
User, Address, Dingaling, sess = self._collection_to_scalar_fixture()
u1 = sess.query(User).get(8)
a1 = Address()
u1.addresses.append(a1)
a2 = u1.addresses[0]
a2.email_address = "foo"
sess.query(User).options(
subqueryload("addresses").subqueryload("dingaling")
).filter_by(id=8).all()
assert u1.addresses[-1] is a1
for a in u1.addresses:
if a is not a1:
assert "dingaling" in a.__dict__
else:
assert "dingaling" not in a.__dict__
if a is a2:
eq_(a2.email_address, "foo")
def test_loads_second_level_collection_to_collection(self):
User, Order, Item, sess = self._collection_to_collection_fixture()
u1 = sess.query(User).get(7)
u1.orders
o1 = Order()
u1.orders.append(o1)
sess.query(User).options(
subqueryload("orders").subqueryload("items")
).filter_by(id=7).all()
for o in u1.orders:
if o is not o1:
assert "items" in o.__dict__
else:
assert "items" not in o.__dict__
def test_load_two_levels_collection_to_scalar(self):
User, Address, Dingaling, sess = self._collection_to_scalar_fixture()
u1 = (
sess.query(User)
.filter_by(id=8)
.options(subqueryload("addresses"))
.one()
)
sess.query(User).filter_by(id=8).options(
subqueryload("addresses").subqueryload("dingaling")
).first()
assert "dingaling" in u1.addresses[0].__dict__
def test_load_two_levels_collection_to_collection(self):
User, Order, Item, sess = self._collection_to_collection_fixture()
u1 = (
sess.query(User)
.filter_by(id=7)
.options(subqueryload("orders"))
.one()
)
sess.query(User).filter_by(id=7).options(
subqueryload("orders").subqueryload("items")
).first()
assert "items" in u1.orders[0].__dict__
class OrderBySecondaryTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table(
"m2m",
metadata,
Column(
"id", Integer, primary_key=True, test_needs_autoincrement=True
),
Column("aid", Integer, ForeignKey("a.id")),
Column("bid", Integer, ForeignKey("b.id")),
)
Table(
"a",
metadata,
Column(
"id", Integer, primary_key=True, test_needs_autoincrement=True
),
Column("data", String(50)),
)
Table(
"b",
metadata,
Column(
"id", Integer, primary_key=True, test_needs_autoincrement=True
),
Column("data", String(50)),
)
@classmethod
def fixtures(cls):
return dict(
a=(("id", "data"), (1, "a1"), (2, "a2")),
b=(("id", "data"), (1, "b1"), (2, "b2"), (3, "b3"), (4, "b4")),
m2m=(
("id", "aid", "bid"),
(2, 1, 1),
(4, 2, 4),
(1, 1, 3),
(6, 2, 2),
(3, 1, 2),
(5, 2, 3),
),
)
def test_ordering(self):
a, m2m, b = (self.tables.a, self.tables.m2m, self.tables.b)
class A(fixtures.ComparableEntity):
pass
class B(fixtures.ComparableEntity):
pass
mapper(
A,
a,
properties={
"bs": relationship(
B, secondary=m2m, lazy="subquery", order_by=m2m.c.id
)
},
)
mapper(B, b)
sess = create_session()
def go():
eq_(
sess.query(A).all(),
[
A(
data="a1",
bs=[B(data="b3"), B(data="b1"), B(data="b2")],
),
A(bs=[B(data="b4"), B(data="b3"), B(data="b2")]),
],
)
self.assert_sql_count(testing.db, go, 2)
class BaseRelationFromJoinedSubclassTest(_Polymorphic):
@classmethod
def define_tables(cls, metadata):
Table(
"people",
metadata,
Column(
"person_id",
Integer,
primary_key=True,
test_needs_autoincrement=True,
),
Column("name", String(50)),
Column("type", String(30)),
)
# to test fully, PK of engineers table must be
# named differently from that of people
Table(
"engineers",
metadata,
Column(
"engineer_id",
Integer,
ForeignKey("people.person_id"),
primary_key=True,
),
Column("primary_language", String(50)),
)
Table(
"paperwork",
metadata,
Column(
"paperwork_id",
Integer,
primary_key=True,
test_needs_autoincrement=True,
),
Column("description", String(50)),
Column("person_id", Integer, ForeignKey("people.person_id")),
)
Table(
"pages",
metadata,
Column(
"page_id",
Integer,
primary_key=True,
test_needs_autoincrement=True,
),
Column("stuff", String(50)),
Column("paperwork_id", ForeignKey("paperwork.paperwork_id")),
)
@classmethod
def setup_mappers(cls):
people = cls.tables.people
engineers = cls.tables.engineers
paperwork = cls.tables.paperwork
pages = cls.tables.pages
mapper(
Person,
people,
polymorphic_on=people.c.type,
polymorphic_identity="person",
properties={
"paperwork": relationship(
Paperwork, order_by=paperwork.c.paperwork_id
)
},
)
mapper(
Engineer,
engineers,
inherits=Person,
polymorphic_identity="engineer",
)
mapper(
Paperwork,
paperwork,
properties={"pages": relationship(Page, order_by=pages.c.page_id)},
)
mapper(Page, pages)
@classmethod
def insert_data(cls):
e1 = Engineer(primary_language="java")
e2 = Engineer(primary_language="c++")
e1.paperwork = [
Paperwork(
description="tps report #1",
pages=[
Page(stuff="report1 page1"),
Page(stuff="report1 page2"),
],
),
Paperwork(
description="tps report #2",
pages=[
Page(stuff="report2 page1"),
Page(stuff="report2 page2"),
],
),
]
e2.paperwork = [Paperwork(description="tps report #3")]
sess = create_session()
sess.add_all([e1, e2])
sess.flush()
def test_correct_subquery_nofrom(self):
sess = create_session()
# use Person.paperwork here just to give the least
# amount of context
q = (
sess.query(Engineer)
.filter(Engineer.primary_language == "java")
.options(subqueryload(Person.paperwork))
)
def go():
eq_(
q.all()[0].paperwork,
[
Paperwork(description="tps report #1"),
Paperwork(description="tps report #2"),
],
)
self.assert_sql_execution(
testing.db,
go,
CompiledSQL(
"SELECT people.person_id AS people_person_id, "
"people.name AS people_name, people.type AS people_type, "
"engineers.engineer_id AS engineers_engineer_id, "
"engineers.primary_language AS engineers_primary_language "
"FROM people JOIN engineers ON "
"people.person_id = engineers.engineer_id "
"WHERE engineers.primary_language = :primary_language_1",
{"primary_language_1": "java"},
),
# ensure we get "people JOIN engineer" here, even though
# primary key "people.person_id" is against "Person"
# *and* the path comes out as "Person.paperwork", still
# want to select from "Engineer" entity
CompiledSQL(
"SELECT paperwork.paperwork_id AS paperwork_paperwork_id, "
"paperwork.description AS paperwork_description, "
"paperwork.person_id AS paperwork_person_id, "
"anon_1.people_person_id AS anon_1_people_person_id "
"FROM (SELECT people.person_id AS people_person_id "
"FROM people JOIN engineers "
"ON people.person_id = engineers.engineer_id "
"WHERE engineers.primary_language = "
":primary_language_1) AS anon_1 "
"JOIN paperwork "
"ON anon_1.people_person_id = paperwork.person_id "
"ORDER BY paperwork.paperwork_id",
{"primary_language_1": "java"},
),
)
def test_correct_subquery_existingfrom(self):
sess = create_session()
# use Person.paperwork here just to give the least
# amount of context
q = (
sess.query(Engineer)
.filter(Engineer.primary_language == "java")
.join(Engineer.paperwork)
.filter(Paperwork.description == "tps report #2")
.options(subqueryload(Person.paperwork))
)
def go():
eq_(
q.one().paperwork,
[
Paperwork(description="tps report #1"),
Paperwork(description="tps report #2"),
],
)
self.assert_sql_execution(
testing.db,
go,
CompiledSQL(
"SELECT people.person_id AS people_person_id, "
"people.name AS people_name, people.type AS people_type, "
"engineers.engineer_id AS engineers_engineer_id, "
"engineers.primary_language AS engineers_primary_language "
"FROM people JOIN engineers "
"ON people.person_id = engineers.engineer_id "
"JOIN paperwork ON people.person_id = paperwork.person_id "
"WHERE engineers.primary_language = :primary_language_1 "
"AND paperwork.description = :description_1",
{
"primary_language_1": "java",
"description_1": "tps report #2",
},
),
CompiledSQL(
"SELECT paperwork.paperwork_id AS paperwork_paperwork_id, "
"paperwork.description AS paperwork_description, "
"paperwork.person_id AS paperwork_person_id, "
"anon_1.people_person_id AS anon_1_people_person_id "
"FROM (SELECT people.person_id AS people_person_id "
"FROM people JOIN engineers ON people.person_id = "
"engineers.engineer_id JOIN paperwork "
"ON people.person_id = paperwork.person_id "
"WHERE engineers.primary_language = :primary_language_1 AND "
"paperwork.description = :description_1) AS anon_1 "
"JOIN paperwork ON anon_1.people_person_id = "
"paperwork.person_id "
"ORDER BY paperwork.paperwork_id",
{
"primary_language_1": "java",
"description_1": "tps report #2",
},
),
)
def test_correct_subquery_multilevel(self):
sess = create_session()
# use Person.paperwork here just to give the least
# amount of context
q = (
sess.query(Engineer)
.filter(Engineer.primary_language == "java")
.options(
subqueryload(Engineer.paperwork).subqueryload(Paperwork.pages)
)
)
def go():
eq_(
q.one().paperwork,
[
Paperwork(
description="tps report #1",
pages=[
Page(stuff="report1 page1"),
Page(stuff="report1 page2"),
],
),
Paperwork(
description="tps report #2",
pages=[
Page(stuff="report2 page1"),
Page(stuff="report2 page2"),
],
),
],
)
self.assert_sql_execution(
testing.db,
go,
CompiledSQL(
"SELECT people.person_id AS people_person_id, "
"people.name AS people_name, people.type AS people_type, "
"engineers.engineer_id AS engineers_engineer_id, "
"engineers.primary_language AS engineers_primary_language "
"FROM people JOIN engineers "
"ON people.person_id = engineers.engineer_id "
"WHERE engineers.primary_language = :primary_language_1",
{"primary_language_1": "java"},
),
CompiledSQL(
"SELECT paperwork.paperwork_id AS paperwork_paperwork_id, "
"paperwork.description AS paperwork_description, "
"paperwork.person_id AS paperwork_person_id, "
"anon_1.people_person_id AS anon_1_people_person_id "
"FROM (SELECT people.person_id AS people_person_id "
"FROM people JOIN engineers "
"ON people.person_id = engineers.engineer_id "
"WHERE engineers.primary_language = :primary_language_1) "
"AS anon_1 JOIN paperwork "
"ON anon_1.people_person_id = paperwork.person_id "
"ORDER BY paperwork.paperwork_id",
{"primary_language_1": "java"},
),
CompiledSQL(
"SELECT pages.page_id AS pages_page_id, "
"pages.stuff AS pages_stuff, "
"pages.paperwork_id AS pages_paperwork_id, "
"paperwork_1.paperwork_id AS paperwork_1_paperwork_id "
"FROM (SELECT people.person_id AS people_person_id "
"FROM people JOIN engineers ON people.person_id = "
"engineers.engineer_id "
"WHERE engineers.primary_language = :primary_language_1) "
"AS anon_1 JOIN paperwork AS paperwork_1 "
"ON anon_1.people_person_id = paperwork_1.person_id "
"JOIN pages ON paperwork_1.paperwork_id = pages.paperwork_id "
"ORDER BY pages.page_id",
{"primary_language_1": "java"},
),
)
def test_correct_subquery_with_polymorphic_no_alias(self):
# test #3106
sess = create_session()
wp = with_polymorphic(Person, [Engineer])
q = (
sess.query(wp)
.options(subqueryload(wp.paperwork))
.order_by(Engineer.primary_language.desc())
)
def go():
eq_(
q.first(),
Engineer(
paperwork=[
Paperwork(description="tps report #1"),
Paperwork(description="tps report #2"),
],
primary_language="java",
),
)
self.assert_sql_execution(
testing.db,
go,
CompiledSQL(
"SELECT people.person_id AS people_person_id, "
"people.name AS people_name, people.type AS people_type, "
"engineers.engineer_id AS engineers_engineer_id, "
"engineers.primary_language AS engineers_primary_language "
"FROM people LEFT OUTER JOIN engineers ON people.person_id = "
"engineers.engineer_id ORDER BY engineers.primary_language "
"DESC LIMIT :param_1"
),
CompiledSQL(
"SELECT paperwork.paperwork_id AS paperwork_paperwork_id, "
"paperwork.description AS paperwork_description, "
"paperwork.person_id AS paperwork_person_id, "
"anon_1.people_person_id AS anon_1_people_person_id FROM "
"(SELECT people.person_id AS people_person_id FROM people "
"LEFT OUTER JOIN engineers ON people.person_id = "
"engineers.engineer_id ORDER BY engineers.primary_language "
"DESC LIMIT :param_1) AS anon_1 JOIN paperwork "
"ON anon_1.people_person_id = paperwork.person_id "
"ORDER BY paperwork.paperwork_id"
),
)
def test_correct_subquery_with_polymorphic_alias(self):
# test #3106
sess = create_session()
wp = with_polymorphic(Person, [Engineer], aliased=True)
q = (
sess.query(wp)
.options(subqueryload(wp.paperwork))
.order_by(wp.Engineer.primary_language.desc())
)
def go():
eq_(
q.first(),
Engineer(
paperwork=[
Paperwork(description="tps report #1"),
Paperwork(description="tps report #2"),
],
primary_language="java",
),
)
self.assert_sql_execution(
testing.db,
go,
CompiledSQL(
"SELECT anon_1.people_person_id AS anon_1_people_person_id, "
"anon_1.people_name AS anon_1_people_name, "
"anon_1.people_type AS anon_1_people_type, "
"anon_1.engineers_engineer_id AS "
"anon_1_engineers_engineer_id, "
"anon_1.engineers_primary_language "
"AS anon_1_engineers_primary_language FROM "
"(SELECT people.person_id AS people_person_id, "
"people.name AS people_name, people.type AS people_type, "
"engineers.engineer_id AS engineers_engineer_id, "
"engineers.primary_language AS engineers_primary_language "
"FROM people LEFT OUTER JOIN engineers ON people.person_id = "
"engineers.engineer_id) AS anon_1 "
"ORDER BY anon_1.engineers_primary_language DESC "
"LIMIT :param_1"
),
CompiledSQL(
"SELECT paperwork.paperwork_id AS paperwork_paperwork_id, "
"paperwork.description AS paperwork_description, "
"paperwork.person_id AS paperwork_person_id, "
"anon_1.anon_2_people_person_id AS "
"anon_1_anon_2_people_person_id FROM "
"(SELECT DISTINCT anon_2.people_person_id AS "
"anon_2_people_person_id, "
"anon_2.engineers_primary_language AS "
"anon_2_engineers_primary_language FROM "
"(SELECT people.person_id AS people_person_id, "
"people.name AS people_name, people.type AS people_type, "
"engineers.engineer_id AS engineers_engineer_id, "
"engineers.primary_language AS engineers_primary_language "
"FROM people LEFT OUTER JOIN engineers ON people.person_id = "
"engineers.engineer_id) AS anon_2 "
"ORDER BY anon_2.engineers_primary_language "
"DESC LIMIT :param_1) AS anon_1 "
"JOIN paperwork "
"ON anon_1.anon_2_people_person_id = paperwork.person_id "
"ORDER BY paperwork.paperwork_id"
),
)
def test_correct_subquery_with_polymorphic_flat_alias(self):
# test #3106
sess = create_session()
wp = with_polymorphic(Person, [Engineer], aliased=True, flat=True)
q = (
sess.query(wp)
.options(subqueryload(wp.paperwork))
.order_by(wp.Engineer.primary_language.desc())
)
def go():
eq_(
q.first(),
Engineer(
paperwork=[
Paperwork(description="tps report #1"),
Paperwork(description="tps report #2"),
],
primary_language="java",
),
)
self.assert_sql_execution(
testing.db,
go,
CompiledSQL(
"SELECT people_1.person_id AS people_1_person_id, "
"people_1.name AS people_1_name, "
"people_1.type AS people_1_type, "
"engineers_1.engineer_id AS engineers_1_engineer_id, "
"engineers_1.primary_language AS engineers_1_primary_language "
"FROM people AS people_1 "
"LEFT OUTER JOIN engineers AS engineers_1 "
"ON people_1.person_id = engineers_1.engineer_id "
"ORDER BY engineers_1.primary_language DESC LIMIT :param_1"
),
CompiledSQL(
"SELECT paperwork.paperwork_id AS paperwork_paperwork_id, "
"paperwork.description AS paperwork_description, "
"paperwork.person_id AS paperwork_person_id, "
"anon_1.people_1_person_id AS anon_1_people_1_person_id "
"FROM (SELECT people_1.person_id AS people_1_person_id "
"FROM people AS people_1 "
"LEFT OUTER JOIN engineers AS engineers_1 "
"ON people_1.person_id = engineers_1.engineer_id "
"ORDER BY engineers_1.primary_language DESC LIMIT :param_1) "
"AS anon_1 JOIN paperwork ON anon_1.people_1_person_id = "
"paperwork.person_id ORDER BY paperwork.paperwork_id"
),
)
class SubRelationFromJoinedSubclassMultiLevelTest(_Polymorphic):
@classmethod
def define_tables(cls, metadata):
Table(
"companies",
metadata,
Column(
"company_id",
Integer,
primary_key=True,
test_needs_autoincrement=True,
),
Column("name", String(50)),
)
Table(
"people",
metadata,
Column(
"person_id",
Integer,
primary_key=True,
test_needs_autoincrement=True,
),
Column("company_id", ForeignKey("companies.company_id")),
Column("name", String(50)),
Column("type", String(30)),
)
Table(
"engineers",
metadata,
Column(
"engineer_id", ForeignKey("people.person_id"), primary_key=True
),
Column("primary_language", String(50)),
)
Table(
"machines",
metadata,
Column(
"machine_id",
Integer,
primary_key=True,
test_needs_autoincrement=True,
),
Column("name", String(50)),
Column("engineer_id", ForeignKey("engineers.engineer_id")),
Column(
"machine_type_id", ForeignKey("machine_type.machine_type_id")
),
)
Table(
"machine_type",
metadata,
Column(
"machine_type_id",
Integer,
primary_key=True,
test_needs_autoincrement=True,
),
Column("name", String(50)),
)
@classmethod
def setup_mappers(cls):
companies = cls.tables.companies
people = cls.tables.people
engineers = cls.tables.engineers
machines = cls.tables.machines
machine_type = cls.tables.machine_type
mapper(
Company,
companies,
properties={
"employees": relationship(Person, order_by=people.c.person_id)
},
)
mapper(
Person,
people,
polymorphic_on=people.c.type,
polymorphic_identity="person",
with_polymorphic="*",
)
mapper(
Engineer,
engineers,
inherits=Person,
polymorphic_identity="engineer",
properties={
"machines": relationship(
Machine, order_by=machines.c.machine_id
)
},
)
mapper(
Machine, machines, properties={"type": relationship(MachineType)}
)
mapper(MachineType, machine_type)
@classmethod
def insert_data(cls):
c1 = cls._fixture()
sess = create_session()
sess.add(c1)
sess.flush()
@classmethod
def _fixture(cls):
mt1 = MachineType(name="mt1")
mt2 = MachineType(name="mt2")
return Company(
employees=[
Engineer(
name="e1",
machines=[
Machine(name="m1", type=mt1),
Machine(name="m2", type=mt2),
],
),
Engineer(
name="e2",
machines=[
Machine(name="m3", type=mt1),
Machine(name="m4", type=mt1),
],
),
]
)
def test_chained_subq_subclass(self):
s = Session()
q = s.query(Company).options(
subqueryload(Company.employees.of_type(Engineer))
.subqueryload(Engineer.machines)
.subqueryload(Machine.type)
)
def go():
eq_(q.all(), [self._fixture()])
self.assert_sql_count(testing.db, go, 4)
class SelfReferentialTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table(
"nodes",
metadata,
Column(
"id", Integer, primary_key=True, test_needs_autoincrement=True
),
Column("parent_id", Integer, ForeignKey("nodes.id")),
Column("data", String(30)),
)
def test_basic(self):
nodes = self.tables.nodes
class Node(fixtures.ComparableEntity):
def append(self, node):
self.children.append(node)
mapper(
Node,
nodes,
properties={
"children": relationship(
Node, lazy="subquery", join_depth=3, order_by=nodes.c.id
)
},
)
sess = create_session()
n1 = Node(data="n1")
n1.append(Node(data="n11"))
n1.append(Node(data="n12"))
n1.append(Node(data="n13"))
n1.children[1].append(Node(data="n121"))
n1.children[1].append(Node(data="n122"))
n1.children[1].append(Node(data="n123"))
n2 = Node(data="n2")
n2.append(Node(data="n21"))
n2.children[0].append(Node(data="n211"))
n2.children[0].append(Node(data="n212"))
sess.add(n1)
sess.add(n2)
sess.flush()
sess.expunge_all()
def go():
d = (
sess.query(Node)
.filter(Node.data.in_(["n1", "n2"]))
.order_by(Node.data)
.all()
)
eq_(
[
Node(
data="n1",
children=[
Node(data="n11"),
Node(
data="n12",
children=[
Node(data="n121"),
Node(data="n122"),
Node(data="n123"),
],
),
Node(data="n13"),
],
),
Node(
data="n2",
children=[
Node(
data="n21",
children=[
Node(data="n211"),
Node(data="n212"),
],
)
],
),
],
d,
)
self.assert_sql_count(testing.db, go, 4)
def test_lazy_fallback_doesnt_affect_eager(self):
nodes = self.tables.nodes
class Node(fixtures.ComparableEntity):
def append(self, node):
self.children.append(node)
mapper(
Node,
nodes,
properties={
"children": relationship(
Node, lazy="subquery", join_depth=1, order_by=nodes.c.id
)
},
)
sess = create_session()
n1 = Node(data="n1")
n1.append(Node(data="n11"))
n1.append(Node(data="n12"))
n1.append(Node(data="n13"))
n1.children[0].append(Node(data="n111"))
n1.children[0].append(Node(data="n112"))
n1.children[1].append(Node(data="n121"))
n1.children[1].append(Node(data="n122"))
n1.children[1].append(Node(data="n123"))
sess.add(n1)
sess.flush()
sess.expunge_all()
def go():
allnodes = sess.query(Node).order_by(Node.data).all()
n11 = allnodes[1]
eq_(n11.data, "n11")
eq_([Node(data="n111"), Node(data="n112")], list(n11.children))
n12 = allnodes[4]
eq_(n12.data, "n12")
eq_(
[Node(data="n121"), Node(data="n122"), Node(data="n123")],
list(n12.children),
)
self.assert_sql_count(testing.db, go, 2)
def test_with_deferred(self):
nodes = self.tables.nodes
class Node(fixtures.ComparableEntity):
def append(self, node):
self.children.append(node)
mapper(
Node,
nodes,
properties={
"children": relationship(
Node, lazy="subquery", join_depth=3, order_by=nodes.c.id
),
"data": deferred(nodes.c.data),
},
)
sess = create_session()
n1 = Node(data="n1")
n1.append(Node(data="n11"))
n1.append(Node(data="n12"))
sess.add(n1)
sess.flush()
sess.expunge_all()
def go():
eq_(
Node(data="n1", children=[Node(data="n11"), Node(data="n12")]),
sess.query(Node).order_by(Node.id).first(),
)
self.assert_sql_count(testing.db, go, 6)
sess.expunge_all()
def go():
eq_(
Node(data="n1", children=[Node(data="n11"), Node(data="n12")]),
sess.query(Node)
.options(undefer("data"))
.order_by(Node.id)
.first(),
)
self.assert_sql_count(testing.db, go, 5)
sess.expunge_all()
def go():
eq_(
Node(data="n1", children=[Node(data="n11"), Node(data="n12")]),
sess.query(Node)
.options(undefer("data"), undefer("children.data"))
.first(),
)
self.assert_sql_count(testing.db, go, 3)
def test_options(self):
nodes = self.tables.nodes
class Node(fixtures.ComparableEntity):
def append(self, node):
self.children.append(node)
mapper(
Node,
nodes,
properties={"children": relationship(Node, order_by=nodes.c.id)},
)
sess = create_session()
n1 = Node(data="n1")
n1.append(Node(data="n11"))
n1.append(Node(data="n12"))
n1.append(Node(data="n13"))
n1.children[1].append(Node(data="n121"))
n1.children[1].append(Node(data="n122"))
n1.children[1].append(Node(data="n123"))
sess.add(n1)
sess.flush()
sess.expunge_all()
def go():
d = (
sess.query(Node)
.filter_by(data="n1")
.order_by(Node.id)
.options(subqueryload("children").subqueryload("children"))
.first()
)
eq_(
Node(
data="n1",
children=[
Node(data="n11"),
Node(
data="n12",
children=[
Node(data="n121"),
Node(data="n122"),
Node(data="n123"),
],
),
Node(data="n13"),
],
),
d,
)
self.assert_sql_count(testing.db, go, 3)
def test_no_depth(self):
"""no join depth is set, so no eager loading occurs."""
nodes = self.tables.nodes
class Node(fixtures.ComparableEntity):
def append(self, node):
self.children.append(node)
mapper(
Node,
nodes,
properties={"children": relationship(Node, lazy="subquery")},
)
sess = create_session()
n1 = Node(data="n1")
n1.append(Node(data="n11"))
n1.append(Node(data="n12"))
n1.append(Node(data="n13"))
n1.children[1].append(Node(data="n121"))
n1.children[1].append(Node(data="n122"))
n1.children[1].append(Node(data="n123"))
n2 = Node(data="n2")
n2.append(Node(data="n21"))
sess.add(n1)
sess.add(n2)
sess.flush()
sess.expunge_all()
def go():
d = (
sess.query(Node)
.filter(Node.data.in_(["n1", "n2"]))
.order_by(Node.data)
.all()
)
eq_(
[
Node(
data="n1",
children=[
Node(data="n11"),
Node(
data="n12",
children=[
Node(data="n121"),
Node(data="n122"),
Node(data="n123"),
],
),
Node(data="n13"),
],
),
Node(data="n2", children=[Node(data="n21")]),
],
d,
)
self.assert_sql_count(testing.db, go, 4)
class InheritanceToRelatedTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table(
"foo",
metadata,
Column("id", Integer, primary_key=True),
Column("type", String(50)),
Column("related_id", Integer, ForeignKey("related.id")),
)
Table(
"bar",
metadata,
Column("id", Integer, ForeignKey("foo.id"), primary_key=True),
)
Table(
"baz",
metadata,
Column("id", Integer, ForeignKey("foo.id"), primary_key=True),
)
Table("related", metadata, Column("id", Integer, primary_key=True))
@classmethod
def setup_classes(cls):
class Foo(cls.Comparable):
pass
class Bar(Foo):
pass
class Baz(Foo):
pass
class Related(cls.Comparable):
pass
@classmethod
def fixtures(cls):
return dict(
foo=[
("id", "type", "related_id"),
(1, "bar", 1),
(2, "bar", 2),
(3, "baz", 1),
(4, "baz", 2),
],
bar=[("id",), (1,), (2,)],
baz=[("id",), (3,), (4,)],
related=[("id",), (1,), (2,)],
)
@classmethod
def setup_mappers(cls):
mapper(
cls.classes.Foo,
cls.tables.foo,
properties={"related": relationship(cls.classes.Related)},
polymorphic_on=cls.tables.foo.c.type,
)
mapper(
cls.classes.Bar,
cls.tables.bar,
polymorphic_identity="bar",
inherits=cls.classes.Foo,
)
mapper(
cls.classes.Baz,
cls.tables.baz,
polymorphic_identity="baz",
inherits=cls.classes.Foo,
)
mapper(cls.classes.Related, cls.tables.related)
def test_caches_query_per_base_subq(self):
Foo, Bar, Baz, Related = (
self.classes.Foo,
self.classes.Bar,
self.classes.Baz,
self.classes.Related,
)
s = Session(testing.db)
def go():
eq_(
s.query(Foo)
.with_polymorphic([Bar, Baz])
.order_by(Foo.id)
.options(subqueryload(Foo.related))
.all(),
[
Bar(id=1, related=Related(id=1)),
Bar(id=2, related=Related(id=2)),
Baz(id=3, related=Related(id=1)),
Baz(id=4, related=Related(id=2)),
],
)
self.assert_sql_count(testing.db, go, 2)
def test_caches_query_per_base_joined(self):
# technically this should be in test_eager_relations
Foo, Bar, Baz, Related = (
self.classes.Foo,
self.classes.Bar,
self.classes.Baz,
self.classes.Related,
)
s = Session(testing.db)
def go():
eq_(
s.query(Foo)
.with_polymorphic([Bar, Baz])
.order_by(Foo.id)
.options(joinedload(Foo.related))
.all(),
[
Bar(id=1, related=Related(id=1)),
Bar(id=2, related=Related(id=2)),
Baz(id=3, related=Related(id=1)),
Baz(id=4, related=Related(id=2)),
],
)
self.assert_sql_count(testing.db, go, 1)
class CyclicalInheritingEagerTestOne(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table(
"t1",
metadata,
Column(
"c1", Integer, primary_key=True, test_needs_autoincrement=True
),
Column("c2", String(30)),
Column("type", String(30)),
)
Table(
"t2",
metadata,
Column(
"c1", Integer, primary_key=True, test_needs_autoincrement=True
),
Column("c2", String(30)),
Column("type", String(30)),
Column("t1.id", Integer, ForeignKey("t1.c1")),
)
def test_basic(self):
t2, t1 = self.tables.t2, self.tables.t1
class T(object):
pass
class SubT(T):
pass
class T2(object):
pass
class SubT2(T2):
pass
mapper(T, t1, polymorphic_on=t1.c.type, polymorphic_identity="t1")
mapper(
SubT,
None,
inherits=T,
polymorphic_identity="subt1",
properties={
"t2s": relationship(
SubT2,
lazy="subquery",
backref=sa.orm.backref("subt", lazy="subquery"),
)
},
)
mapper(T2, t2, polymorphic_on=t2.c.type, polymorphic_identity="t2")
mapper(SubT2, None, inherits=T2, polymorphic_identity="subt2")
# testing a particular endless loop condition in eager load setup
create_session().query(SubT).all()
class CyclicalInheritingEagerTestTwo(
fixtures.DeclarativeMappedTest, testing.AssertsCompiledSQL
):
__dialect__ = "default"
@classmethod
def setup_classes(cls):
Base = cls.DeclarativeBasic
class PersistentObject(Base):
__tablename__ = "persistent"
id = Column(
Integer, primary_key=True, test_needs_autoincrement=True
)
class Movie(PersistentObject):
__tablename__ = "movie"
id = Column(Integer, ForeignKey("persistent.id"), primary_key=True)
director_id = Column(Integer, ForeignKey("director.id"))
title = Column(String(50))
class Director(PersistentObject):
__tablename__ = "director"
id = Column(Integer, ForeignKey("persistent.id"), primary_key=True)
movies = relationship("Movie", foreign_keys=Movie.director_id)
name = Column(String(50))
def test_from_subclass(self):
Director = self.classes.Director
s = create_session()
ctx = s.query(Director).options(subqueryload("*"))._compile_context()
q = ctx.attributes[
("subquery", (inspect(Director), inspect(Director).attrs.movies))
]
self.assert_compile(
q,
"SELECT movie.id AS movie_id, "
"persistent.id AS persistent_id, "
"movie.director_id AS movie_director_id, "
"movie.title AS movie_title, "
"anon_1.director_id AS anon_1_director_id "
"FROM (SELECT director.id AS director_id "
"FROM persistent JOIN director "
"ON persistent.id = director.id) AS anon_1 "
"JOIN (persistent JOIN movie "
"ON persistent.id = movie.id) "
"ON anon_1.director_id = movie.director_id",
dialect="default",
)
def test_integrate(self):
Director = self.classes.Director
Movie = self.classes.Movie
session = Session(testing.db)
rscott = Director(name="Ridley Scott")
alien = Movie(title="Alien")
brunner = Movie(title="Blade Runner")
rscott.movies.append(brunner)
rscott.movies.append(alien)
session.add_all([rscott, alien, brunner])
session.commit()
close_all_sessions()
d = session.query(Director).options(subqueryload("*")).first() # noqa
assert len(list(session)) == 3
class SubqueryloadDistinctTest(
fixtures.DeclarativeMappedTest, testing.AssertsCompiledSQL
):
__dialect__ = "default"
run_inserts = "once"
run_deletes = None
@classmethod
def setup_classes(cls):
Base = cls.DeclarativeBasic
class Director(Base):
__tablename__ = "director"
id = Column(
Integer, primary_key=True, test_needs_autoincrement=True
)
name = Column(String(50))
class DirectorPhoto(Base):
__tablename__ = "director_photo"
id = Column(
Integer, primary_key=True, test_needs_autoincrement=True
)
path = Column(String(255))
director_id = Column(Integer, ForeignKey("director.id"))
director = relationship(Director, backref="photos")
class Movie(Base):
__tablename__ = "movie"
id = Column(
Integer, primary_key=True, test_needs_autoincrement=True
)
director_id = Column(Integer, ForeignKey("director.id"))
director = relationship(Director, backref="movies")
title = Column(String(50))
credits = relationship("Credit", backref="movie")
class Credit(Base):
__tablename__ = "credit"
id = Column(
Integer, primary_key=True, test_needs_autoincrement=True
)
movie_id = Column(Integer, ForeignKey("movie.id"))
@classmethod
def insert_data(cls):
Movie = cls.classes.Movie
Director = cls.classes.Director
DirectorPhoto = cls.classes.DirectorPhoto
Credit = cls.classes.Credit
d = Director(name="Woody Allen")
d.photos = [DirectorPhoto(path="/1.jpg"), DirectorPhoto(path="/2.jpg")]
d.movies = [
Movie(title="Manhattan", credits=[Credit(), Credit()]),
Movie(title="Sweet and Lowdown", credits=[Credit()]),
]
sess = create_session()
sess.add_all([d])
sess.flush()
def test_distinct_strategy_opt_m2o(self):
self._run_test_m2o(True, None)
self._run_test_m2o(False, None)
def test_distinct_unrelated_opt_m2o(self):
self._run_test_m2o(None, True)
self._run_test_m2o(None, False)
def _run_test_m2o(self, director_strategy_level, photo_strategy_level):
# test where the innermost is m2o, e.g.
# Movie->director
Movie = self.classes.Movie
Director = self.classes.Director
Movie.director.property.distinct_target_key = director_strategy_level
Director.photos.property.distinct_target_key = photo_strategy_level
# the DISTINCT is controlled by
# only the Movie->director relationship, *not* the
# Director.photos
expect_distinct = director_strategy_level in (True, None)
s = create_session()
q = s.query(Movie).options(
subqueryload(Movie.director).subqueryload(Director.photos)
)
ctx = q._compile_context()
q2 = ctx.attributes[
("subquery", (inspect(Movie), inspect(Movie).attrs.director))
]
self.assert_compile(
q2,
"SELECT director.id AS director_id, "
"director.name AS director_name, "
"anon_1.movie_director_id AS anon_1_movie_director_id "
"FROM (SELECT%s movie.director_id AS movie_director_id "
"FROM movie) AS anon_1 "
"JOIN director ON director.id = anon_1.movie_director_id"
% (" DISTINCT" if expect_distinct else ""),
)
ctx2 = q2._compile_context()
result = s.execute(q2)
rows = result.fetchall()
if expect_distinct:
eq_(rows, [(1, "Woody Allen", 1)])
else:
eq_(rows, [(1, "Woody Allen", 1), (1, "Woody Allen", 1)])
q3 = ctx2.attributes[
("subquery", (inspect(Director), inspect(Director).attrs.photos))
]
self.assert_compile(
q3,
"SELECT director_photo.id AS director_photo_id, "
"director_photo.path AS director_photo_path, "
"director_photo.director_id AS director_photo_director_id, "
"director_1.id AS director_1_id "
"FROM (SELECT%s movie.director_id AS movie_director_id "
"FROM movie) AS anon_1 "
"JOIN director AS director_1 "
"ON director_1.id = anon_1.movie_director_id "
"JOIN director_photo "
"ON director_1.id = director_photo.director_id"
% (" DISTINCT" if expect_distinct else ""),
)
result = s.execute(q3)
rows = result.fetchall()
if expect_distinct:
eq_(
set(tuple(t) for t in rows),
set([(1, "/1.jpg", 1, 1), (2, "/2.jpg", 1, 1)]),
)
else:
# oracle might not order the way we expect here
eq_(
set(tuple(t) for t in rows),
set(
[
(1, "/1.jpg", 1, 1),
(2, "/2.jpg", 1, 1),
(1, "/1.jpg", 1, 1),
(2, "/2.jpg", 1, 1),
]
),
)
movies = q.all() # noqa
# check number of persistent objects in session
eq_(len(list(s)), 5)
def test_cant_do_distinct_in_joins(self):
"""the DISTINCT feature here works when the m2o is in the innermost
mapper, but when we are just joining along relationships outside
of that, we can still have dupes, and there's no solution to that.
"""
Movie = self.classes.Movie
Credit = self.classes.Credit
s = create_session()
q = s.query(Credit).options(
subqueryload(Credit.movie).subqueryload(Movie.director)
)
ctx = q._compile_context()
q2 = ctx.attributes[
("subquery", (inspect(Credit), Credit.movie.property))
]
ctx2 = q2._compile_context()
q3 = ctx2.attributes[
("subquery", (inspect(Movie), Movie.director.property))
]
result = s.execute(q3)
eq_(result.fetchall(), [(1, "Woody Allen", 1), (1, "Woody Allen", 1)])
class JoinedNoLoadConflictTest(fixtures.DeclarativeMappedTest):
"""test for [ticket:2887]"""
@classmethod
def setup_classes(cls):
Base = cls.DeclarativeBasic
class Parent(ComparableEntity, Base):
__tablename__ = "parent"
id = Column(
Integer, primary_key=True, test_needs_autoincrement=True
)
name = Column(String(20))
children = relationship(
"Child", back_populates="parent", lazy="noload"
)
class Child(ComparableEntity, Base):
__tablename__ = "child"
id = Column(
Integer, primary_key=True, test_needs_autoincrement=True
)
name = Column(String(20))
parent_id = Column(Integer, ForeignKey("parent.id"))
parent = relationship(
"Parent", back_populates="children", lazy="joined"
)
@classmethod
def insert_data(cls):
Parent = cls.classes.Parent
Child = cls.classes.Child
s = Session()
s.add(Parent(name="parent", children=[Child(name="c1")]))
s.commit()
def test_subqueryload_on_joined_noload(self):
Parent = self.classes.Parent
Child = self.classes.Child
s = Session()
# here we have
# Parent->subqueryload->Child->joinedload->parent->noload->children.
# the actual subqueryload has to emit *after* we've started populating
# Parent->subqueryload->child.
parent = s.query(Parent).options([subqueryload("children")]).first()
eq_(parent.children, [Child(name="c1")])
class SelfRefInheritanceAliasedTest(
fixtures.DeclarativeMappedTest, testing.AssertsCompiledSQL
):
__dialect__ = "default"
@classmethod
def setup_classes(cls):
Base = cls.DeclarativeBasic
class Foo(Base):
__tablename__ = "foo"
id = Column(Integer, primary_key=True)
type = Column(String(50))
foo_id = Column(Integer, ForeignKey("foo.id"))
foo = relationship(
lambda: Foo, foreign_keys=foo_id, remote_side=id
)
__mapper_args__ = {
"polymorphic_on": type,
"polymorphic_identity": "foo",
}
class Bar(Foo):
__mapper_args__ = {"polymorphic_identity": "bar"}
@classmethod
def insert_data(cls):
Foo, Bar = cls.classes("Foo", "Bar")
session = Session()
target = Bar(id=1)
b1 = Bar(id=2, foo=Foo(id=3, foo=target))
session.add(b1)
session.commit()
def test_twolevel_subquery_w_polymorphic(self):
Foo, Bar = self.classes("Foo", "Bar")
r = with_polymorphic(Foo, "*", aliased=True)
attr1 = Foo.foo.of_type(r)
attr2 = r.foo
s = Session()
q = (
s.query(Foo)
.filter(Foo.id == 2)
.options(subqueryload(attr1).subqueryload(attr2))
)
self.assert_sql_execution(
testing.db,
q.all,
CompiledSQL(
"SELECT foo.id AS foo_id_1, foo.type AS foo_type, "
"foo.foo_id AS foo_foo_id FROM foo WHERE foo.id = :id_1",
[{"id_1": 2}],
),
CompiledSQL(
"SELECT foo_1.id AS foo_1_id, foo_1.type AS foo_1_type, "
"foo_1.foo_id AS foo_1_foo_id, "
"anon_1.foo_foo_id AS anon_1_foo_foo_id "
"FROM (SELECT DISTINCT foo.foo_id AS foo_foo_id "
"FROM foo WHERE foo.id = :id_1) AS anon_1 "
"JOIN foo AS foo_1 ON foo_1.id = anon_1.foo_foo_id",
{"id_1": 2},
),
CompiledSQL(
"SELECT foo.id AS foo_id_1, foo.type AS foo_type, "
"foo.foo_id AS foo_foo_id, foo_1.foo_id AS foo_1_foo_id "
"FROM (SELECT DISTINCT foo.foo_id AS foo_foo_id FROM foo "
"WHERE foo.id = :id_1) AS anon_1 "
"JOIN foo AS foo_1 ON foo_1.id = anon_1.foo_foo_id "
"JOIN foo ON foo.id = foo_1.foo_id",
{"id_1": 2},
),
)
class TestExistingRowPopulation(fixtures.DeclarativeMappedTest):
@classmethod
def setup_classes(cls):
Base = cls.DeclarativeBasic
class A(Base):
__tablename__ = "a"
id = Column(Integer, primary_key=True)
b_id = Column(ForeignKey("b.id"))
a2_id = Column(ForeignKey("a2.id"))
a2 = relationship("A2")
b = relationship("B")
class A2(Base):
__tablename__ = "a2"
id = Column(Integer, primary_key=True)
b_id = Column(ForeignKey("b.id"))
b = relationship("B")
class B(Base):
__tablename__ = "b"
id = Column(Integer, primary_key=True)
c1_m2o_id = Column(ForeignKey("c1_m2o.id"))
c2_m2o_id = Column(ForeignKey("c2_m2o.id"))
c1_o2m = relationship("C1o2m")
c2_o2m = relationship("C2o2m")
c1_m2o = relationship("C1m2o")
c2_m2o = relationship("C2m2o")
class C1o2m(Base):
__tablename__ = "c1_o2m"
id = Column(Integer, primary_key=True)
b_id = Column(ForeignKey("b.id"))
class C2o2m(Base):
__tablename__ = "c2_o2m"
id = Column(Integer, primary_key=True)
b_id = Column(ForeignKey("b.id"))
class C1m2o(Base):
__tablename__ = "c1_m2o"
id = Column(Integer, primary_key=True)
class C2m2o(Base):
__tablename__ = "c2_m2o"
id = Column(Integer, primary_key=True)
@classmethod
def insert_data(cls):
A, A2, B, C1o2m, C2o2m, C1m2o, C2m2o = cls.classes(
"A", "A2", "B", "C1o2m", "C2o2m", "C1m2o", "C2m2o"
)
s = Session()
b = B(
c1_o2m=[C1o2m()], c2_o2m=[C2o2m()], c1_m2o=C1m2o(), c2_m2o=C2m2o()
)
s.add(A(b=b, a2=A2(b=b)))
s.commit()
def test_o2m(self):
A, A2, B, C1o2m, C2o2m = self.classes("A", "A2", "B", "C1o2m", "C2o2m")
s = Session()
# A -J-> B -L-> C1
# A -J-> B -S-> C2
# A -J-> A2 -J-> B -S-> C1
# A -J-> A2 -J-> B -L-> C2
q = s.query(A).options(
joinedload(A.b).subqueryload(B.c2_o2m),
joinedload(A.a2).joinedload(A2.b).subqueryload(B.c1_o2m),
)
a1 = q.all()[0]
is_true("c1_o2m" in a1.b.__dict__)
is_true("c2_o2m" in a1.b.__dict__)
def test_m2o(self):
A, A2, B, C1m2o, C2m2o = self.classes("A", "A2", "B", "C1m2o", "C2m2o")
s = Session()
# A -J-> B -L-> C1
# A -J-> B -S-> C2
# A -J-> A2 -J-> B -S-> C1
# A -J-> A2 -J-> B -L-> C2
q = s.query(A).options(
joinedload(A.b).subqueryload(B.c2_m2o),
joinedload(A.a2).joinedload(A2.b).subqueryload(B.c1_m2o),
)
a1 = q.all()[0]
is_true("c1_m2o" in a1.b.__dict__)
is_true("c2_m2o" in a1.b.__dict__)
Reference in New Issue View Git Blame Copy Permalink