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import sqlalchemy as sa
from sqlalchemy import testing, util
from sqlalchemy.orm import mapper, deferred, defer, undefer, Load, \
load_only, undefer_group, create_session, synonym, relationship, Session,\
joinedload, defaultload, aliased, contains_eager, with_polymorphic
from sqlalchemy.testing import eq_, AssertsCompiledSQL, assert_raises_message
from test.orm import _fixtures
from .inheritance._poly_fixtures import Company, Person, Engineer, Manager, \
Boss, Machine, Paperwork, _Polymorphic
class DeferredTest(AssertsCompiledSQL, _fixtures.FixtureTest):
def test_basic(self):
"""A basic deferred load."""
Order, orders = self.classes.Order, self.tables.orders
mapper(Order, orders, order_by=orders.c.id, properties={
'description': deferred(orders.c.description)})
o = Order()
self.assert_(o.description is None)
q = create_session().query(Order)
def go():
l = q.all()
o2 = l[2]
x = o2.description
self.sql_eq_(go, [
("SELECT orders.id AS orders_id, "
"orders.user_id AS orders_user_id, "
"orders.address_id AS orders_address_id, "
"orders.isopen AS orders_isopen "
"FROM orders ORDER BY orders.id", {}),
("SELECT orders.description AS orders_description "
"FROM orders WHERE orders.id = :param_1",
{'param_1':3})])
def test_defer_primary_key(self):
"""what happens when we try to defer the primary key?"""
Order, orders = self.classes.Order, self.tables.orders
mapper(Order, orders, order_by=orders.c.id, properties={
'id': deferred(orders.c.id)})
# right now, it's not that graceful :)
q = create_session().query(Order)
assert_raises_message(
sa.exc.NoSuchColumnError,
"Could not locate",
q.first
)
def test_unsaved(self):
"""Deferred loading does not kick in when just PK cols are set."""
Order, orders = self.classes.Order, self.tables.orders
mapper(Order, orders, properties={
'description': deferred(orders.c.description)})
sess = create_session()
o = Order()
sess.add(o)
o.id = 7
def go():
o.description = "some description"
self.sql_count_(0, go)
def test_synonym_group_bug(self):
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties={
'isopen':synonym('_isopen', map_column=True),
'description':deferred(orders.c.description, group='foo')
})
sess = create_session()
o1 = sess.query(Order).get(1)
eq_(o1.description, "order 1")
def test_unsaved_2(self):
Order, orders = self.classes.Order, self.tables.orders
mapper(Order, orders, properties={
'description': deferred(orders.c.description)})
sess = create_session()
o = Order()
sess.add(o)
def go():
o.description = "some description"
self.sql_count_(0, go)
def test_unsaved_group(self):
"""Deferred loading doesn't kick in when just PK cols are set"""
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, order_by=orders.c.id, properties=dict(
description=deferred(orders.c.description, group='primary'),
opened=deferred(orders.c.isopen, group='primary')))
sess = create_session()
o = Order()
sess.add(o)
o.id = 7
def go():
o.description = "some description"
self.sql_count_(0, go)
def test_unsaved_group_2(self):
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, order_by=orders.c.id, properties=dict(
description=deferred(orders.c.description, group='primary'),
opened=deferred(orders.c.isopen, group='primary')))
sess = create_session()
o = Order()
sess.add(o)
def go():
o.description = "some description"
self.sql_count_(0, go)
def test_save(self):
Order, orders = self.classes.Order, self.tables.orders
m = mapper(Order, orders, properties={
'description': deferred(orders.c.description)})
sess = create_session()
o2 = sess.query(Order).get(2)
o2.isopen = 1
sess.flush()
def test_group(self):
"""Deferred load with a group"""
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties=util.OrderedDict([
('userident', deferred(orders.c.user_id, group='primary')),
('addrident', deferred(orders.c.address_id, group='primary')),
('description', deferred(orders.c.description, group='primary')),
('opened', deferred(orders.c.isopen, group='primary'))
]))
sess = create_session()
q = sess.query(Order).order_by(Order.id)
def go():
l = q.all()
o2 = l[2]
eq_(o2.opened, 1)
eq_(o2.userident, 7)
eq_(o2.description, 'order 3')
self.sql_eq_(go, [
("SELECT orders.id AS orders_id "
"FROM orders ORDER BY orders.id", {}),
("SELECT orders.user_id AS orders_user_id, "
"orders.address_id AS orders_address_id, "
"orders.description AS orders_description, "
"orders.isopen AS orders_isopen "
"FROM orders WHERE orders.id = :param_1",
{'param_1':3})])
o2 = q.all()[2]
eq_(o2.description, 'order 3')
assert o2 not in sess.dirty
o2.description = 'order 3'
def go():
sess.flush()
self.sql_count_(0, go)
def test_preserve_changes(self):
"""A deferred load operation doesn't revert modifications on attributes"""
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties = {
'userident': deferred(orders.c.user_id, group='primary'),
'description': deferred(orders.c.description, group='primary'),
'opened': deferred(orders.c.isopen, group='primary')
})
sess = create_session()
o = sess.query(Order).get(3)
assert 'userident' not in o.__dict__
o.description = 'somenewdescription'
eq_(o.description, 'somenewdescription')
def go():
eq_(o.opened, 1)
self.assert_sql_count(testing.db, go, 1)
eq_(o.description, 'somenewdescription')
assert o in sess.dirty
def test_commits_state(self):
"""
When deferred elements are loaded via a group, they get the proper
CommittedState and don't result in changes being committed
"""
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties = {
'userident': deferred(orders.c.user_id, group='primary'),
'description': deferred(orders.c.description, group='primary'),
'opened': deferred(orders.c.isopen, group='primary')})
sess = create_session()
o2 = sess.query(Order).get(3)
# this will load the group of attributes
eq_(o2.description, 'order 3')
assert o2 not in sess.dirty
# this will mark it as 'dirty', but nothing actually changed
o2.description = 'order 3'
# therefore the flush() shouldn't actually issue any SQL
self.assert_sql_count(testing.db, sess.flush, 0)
def test_map_selectable_wo_deferred(self):
"""test mapping to a selectable with deferred cols,
the selectable doesn't include the deferred col.
"""
Order, orders = self.classes.Order, self.tables.orders
order_select = sa.select([
orders.c.id,
orders.c.user_id,
orders.c.address_id,
orders.c.description,
orders.c.isopen]).alias()
mapper(Order, order_select, properties={
'description':deferred(order_select.c.description)
})
sess = Session()
o1 = sess.query(Order).order_by(Order.id).first()
assert 'description' not in o1.__dict__
eq_(o1.description, 'order 1')
class DeferredOptionsTest(AssertsCompiledSQL, _fixtures.FixtureTest):
__dialect__ = 'default'
def test_options(self):
"""Options on a mapper to create deferred and undeferred columns"""
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders)
sess = create_session()
q = sess.query(Order).order_by(Order.id).options(defer('user_id'))
def go():
q.all()[0].user_id
self.sql_eq_(go, [
("SELECT orders.id AS orders_id, "
"orders.address_id AS orders_address_id, "
"orders.description AS orders_description, "
"orders.isopen AS orders_isopen "
"FROM orders ORDER BY orders.id", {}),
("SELECT orders.user_id AS orders_user_id "
"FROM orders WHERE orders.id = :param_1",
{'param_1':1})])
sess.expunge_all()
q2 = q.options(undefer('user_id'))
self.sql_eq_(q2.all, [
("SELECT orders.id AS orders_id, "
"orders.user_id AS orders_user_id, "
"orders.address_id AS orders_address_id, "
"orders.description AS orders_description, "
"orders.isopen AS orders_isopen "
"FROM orders ORDER BY orders.id",
{})])
def test_undefer_group(self):
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties=util.OrderedDict([
('userident', deferred(orders.c.user_id, group='primary')),
('description', deferred(orders.c.description, group='primary')),
('opened', deferred(orders.c.isopen, group='primary'))
]
))
sess = create_session()
q = sess.query(Order).order_by(Order.id)
def go():
l = q.options(undefer_group('primary')).all()
o2 = l[2]
eq_(o2.opened, 1)
eq_(o2.userident, 7)
eq_(o2.description, 'order 3')
self.sql_eq_(go, [
("SELECT orders.user_id AS orders_user_id, "
"orders.description AS orders_description, "
"orders.isopen AS orders_isopen, "
"orders.id AS orders_id, "
"orders.address_id AS orders_address_id "
"FROM orders ORDER BY orders.id",
{})])
def test_undefer_group_multi(self):
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties=util.OrderedDict([
('userident', deferred(orders.c.user_id, group='primary')),
('description', deferred(orders.c.description, group='primary')),
('opened', deferred(orders.c.isopen, group='secondary'))
]
))
sess = create_session()
q = sess.query(Order).order_by(Order.id)
def go():
l = q.options(
undefer_group('primary'), undefer_group('secondary')).all()
o2 = l[2]
eq_(o2.opened, 1)
eq_(o2.userident, 7)
eq_(o2.description, 'order 3')
self.sql_eq_(go, [
("SELECT orders.user_id AS orders_user_id, "
"orders.description AS orders_description, "
"orders.isopen AS orders_isopen, "
"orders.id AS orders_id, "
"orders.address_id AS orders_address_id "
"FROM orders ORDER BY orders.id",
{})])
def test_undefer_group_multi_pathed(self):
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties=util.OrderedDict([
('userident', deferred(orders.c.user_id, group='primary')),
('description', deferred(orders.c.description, group='primary')),
('opened', deferred(orders.c.isopen, group='secondary'))
]
))
sess = create_session()
q = sess.query(Order).order_by(Order.id)
def go():
l = q.options(
Load(Order).undefer_group('primary').undefer_group('secondary')).all()
o2 = l[2]
eq_(o2.opened, 1)
eq_(o2.userident, 7)
eq_(o2.description, 'order 3')
self.sql_eq_(go, [
("SELECT orders.user_id AS orders_user_id, "
"orders.description AS orders_description, "
"orders.isopen AS orders_isopen, "
"orders.id AS orders_id, "
"orders.address_id AS orders_address_id "
"FROM orders ORDER BY orders.id",
{})])
def test_undefer_star(self):
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties=util.OrderedDict([
('userident', deferred(orders.c.user_id)),
('description', deferred(orders.c.description)),
('opened', deferred(orders.c.isopen))
]
))
sess = create_session()
q = sess.query(Order).options(Load(Order).undefer('*'))
self.assert_compile(q,
"SELECT orders.user_id AS orders_user_id, "
"orders.description AS orders_description, "
"orders.isopen AS orders_isopen, "
"orders.id AS orders_id, "
"orders.address_id AS orders_address_id FROM orders"
)
def test_locates_col(self):
"""changed in 1.0 - we don't search for deferred cols in the result
now. """
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties={
'description': deferred(orders.c.description)})
sess = create_session()
o1 = (sess.query(Order).
order_by(Order.id).
add_column(orders.c.description).first())[0]
def go():
eq_(o1.description, 'order 1')
# prior to 1.0 we'd search in the result for this column
# self.sql_count_(0, go)
self.sql_count_(1, go)
def test_locates_col_rowproc_only(self):
"""changed in 1.0 - we don't search for deferred cols in the result
now.
Because the loading for ORM Query and Query from a core select
is now split off, we test loading from a plain select()
separately.
"""
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties={
'description': deferred(orders.c.description)})
sess = create_session()
stmt = sa.select([Order]).order_by(Order.id)
o1 = (sess.query(Order).
from_statement(stmt).all())[0]
def go():
eq_(o1.description, 'order 1')
# prior to 1.0 we'd search in the result for this column
# self.sql_count_(0, go)
self.sql_count_(1, go)
def test_deep_options(self):
users, items, order_items, Order, Item, User, orders = (self.tables.users,
self.tables.items,
self.tables.order_items,
self.classes.Order,
self.classes.Item,
self.classes.User,
self.tables.orders)
mapper(Item, items, properties=dict(
description=deferred(items.c.description)))
mapper(Order, orders, properties=dict(
items=relationship(Item, secondary=order_items)))
mapper(User, users, properties=dict(
orders=relationship(Order, order_by=orders.c.id)))
sess = create_session()
q = sess.query(User).order_by(User.id)
l = q.all()
item = l[0].orders[1].items[1]
def go():
eq_(item.description, 'item 4')
self.sql_count_(1, go)
eq_(item.description, 'item 4')
sess.expunge_all()
l = q.options(undefer('orders.items.description')).all()
item = l[0].orders[1].items[1]
def go():
eq_(item.description, 'item 4')
self.sql_count_(0, go)
eq_(item.description, 'item 4')
def test_path_entity(self):
"""test the legacy *addl_attrs argument."""
User = self.classes.User
Order = self.classes.Order
Item = self.classes.Item
users = self.tables.users
orders = self.tables.orders
items = self.tables.items
order_items = self.tables.order_items
mapper(User, users, properties={
"orders": relationship(Order, lazy="joined")
})
mapper(Order, orders, properties={
"items": relationship(Item, secondary=order_items, lazy="joined")
})
mapper(Item, items)
sess = create_session()
exp = ("SELECT users.id AS users_id, users.name AS users_name, "
"items_1.id AS items_1_id, orders_1.id AS orders_1_id, "
"orders_1.user_id AS orders_1_user_id, orders_1.address_id "
"AS orders_1_address_id, orders_1.description AS "
"orders_1_description, orders_1.isopen AS orders_1_isopen "
"FROM users LEFT OUTER JOIN orders AS orders_1 "
"ON users.id = orders_1.user_id LEFT OUTER JOIN "
"(order_items AS order_items_1 JOIN items AS items_1 "
"ON items_1.id = order_items_1.item_id) "
"ON orders_1.id = order_items_1.order_id")
q = sess.query(User).options(defer(User.orders, Order.items, Item.description))
self.assert_compile(q, exp)
def test_chained_multi_col_options(self):
users, User = self.tables.users, self.classes.User
orders, Order = self.tables.orders, self.classes.Order
mapper(User, users, properties={
"orders": relationship(Order)
})
mapper(Order, orders)
sess = create_session()
q = sess.query(User).options(
joinedload(User.orders).defer("description").defer("isopen")
)
self.assert_compile(q,
"SELECT users.id AS users_id, users.name AS users_name, "
"orders_1.id AS orders_1_id, orders_1.user_id AS orders_1_user_id, "
"orders_1.address_id AS orders_1_address_id FROM users "
"LEFT OUTER JOIN orders AS orders_1 ON users.id = orders_1.user_id"
)
def test_load_only_no_pk(self):
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders)
sess = create_session()
q = sess.query(Order).options(load_only("isopen", "description"))
self.assert_compile(q,
"SELECT orders.id AS orders_id, "
"orders.description AS orders_description, "
"orders.isopen AS orders_isopen FROM orders")
def test_load_only_no_pk_rt(self):
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders)
sess = create_session()
q = sess.query(Order).order_by(Order.id).\
options(load_only("isopen", "description"))
eq_(q.first(), Order(id=1))
def test_load_only_w_deferred(self):
orders, Order = self.tables.orders, self.classes.Order
mapper(Order, orders, properties={
"description": deferred(orders.c.description)
})
sess = create_session()
q = sess.query(Order).options(
load_only("isopen", "description"),
undefer("user_id")
)
self.assert_compile(q,
"SELECT orders.description AS orders_description, "
"orders.id AS orders_id, "
"orders.user_id AS orders_user_id, "
"orders.isopen AS orders_isopen FROM orders")
def test_load_only_propagate_unbound(self):
self._test_load_only_propagate(False)
def test_load_only_propagate_bound(self):
self._test_load_only_propagate(True)
def _test_load_only_propagate(self, use_load):
User = self.classes.User
Address = self.classes.Address
users = self.tables.users
addresses = self.tables.addresses
mapper(User, users, properties={
"addresses": relationship(Address)
})
mapper(Address, addresses)
sess = create_session()
expected = [
("SELECT users.id AS users_id, users.name AS users_name "
"FROM users WHERE users.id IN (:id_1, :id_2)", {'id_2': 8, 'id_1': 7}),
("SELECT addresses.id AS addresses_id, "
"addresses.email_address AS addresses_email_address "
"FROM addresses WHERE :param_1 = addresses.user_id", {'param_1': 7}),
("SELECT addresses.id AS addresses_id, "
"addresses.email_address AS addresses_email_address "
"FROM addresses WHERE :param_1 = addresses.user_id", {'param_1': 8}),
]
if use_load:
opt = Load(User).defaultload(User.addresses).load_only("id", "email_address")
else:
opt = defaultload(User.addresses).load_only("id", "email_address")
q = sess.query(User).options(opt).filter(User.id.in_([7, 8]))
def go():
for user in q:
user.addresses
self.sql_eq_(go, expected)
def test_load_only_parent_specific(self):
User = self.classes.User
Address = self.classes.Address
Order = self.classes.Order
users = self.tables.users
addresses = self.tables.addresses
orders = self.tables.orders
mapper(User, users)
mapper(Address, addresses)
mapper(Order, orders)
sess = create_session()
q = sess.query(User, Order, Address).options(
Load(User).load_only("name"),
Load(Order).load_only("id"),
Load(Address).load_only("id", "email_address")
)
self.assert_compile(q,
"SELECT users.id AS users_id, users.name AS users_name, "
"orders.id AS orders_id, "
"addresses.id AS addresses_id, addresses.email_address "
"AS addresses_email_address FROM users, orders, addresses"
)
def test_load_only_path_specific(self):
User = self.classes.User
Address = self.classes.Address
Order = self.classes.Order
users = self.tables.users
addresses = self.tables.addresses
orders = self.tables.orders
mapper(User, users, properties=util.OrderedDict([
("addresses", relationship(Address, lazy="joined")),
("orders", relationship(Order, lazy="joined"))
]))
mapper(Address, addresses)
mapper(Order, orders)
sess = create_session()
q = sess.query(User).options(
load_only("name").defaultload("addresses").load_only("id", "email_address"),
defaultload("orders").load_only("id")
)
# hmmmm joinedload seems to be forcing users.id into here...
self.assert_compile(
q,
"SELECT users.id AS users_id, users.name AS users_name, "
"addresses_1.id AS addresses_1_id, "
"addresses_1.email_address AS addresses_1_email_address, "
"orders_1.id AS orders_1_id FROM users "
"LEFT OUTER JOIN addresses AS addresses_1 "
"ON users.id = addresses_1.user_id "
"LEFT OUTER JOIN orders AS orders_1 ON users.id = orders_1.user_id"
)
class InheritanceTest(_Polymorphic):
__dialect__ = 'default'
def test_load_only_subclass(self):
s = Session()
q = s.query(Manager).options(load_only("status", "manager_name"))
self.assert_compile(
q,
"SELECT managers.person_id AS managers_person_id, "
"people.person_id AS people_person_id, "
"people.type AS people_type, "
"managers.status AS managers_status, "
"managers.manager_name AS managers_manager_name "
"FROM people JOIN managers "
"ON people.person_id = managers.person_id "
"ORDER BY people.person_id"
)
def test_load_only_subclass_and_superclass(self):
s = Session()
q = s.query(Boss).options(load_only("status", "manager_name"))
self.assert_compile(
q,
"SELECT managers.person_id AS managers_person_id, "
"people.person_id AS people_person_id, "
"people.type AS people_type, "
"managers.status AS managers_status, "
"managers.manager_name AS managers_manager_name "
"FROM people JOIN managers "
"ON people.person_id = managers.person_id JOIN boss "
"ON managers.person_id = boss.boss_id ORDER BY people.person_id"
)
def test_load_only_alias_subclass(self):
s = Session()
m1 = aliased(Manager, flat=True)
q = s.query(m1).options(load_only("status", "manager_name"))
self.assert_compile(
q,
"SELECT managers_1.person_id AS managers_1_person_id, "
"people_1.person_id AS people_1_person_id, "
"people_1.type AS people_1_type, "
"managers_1.status AS managers_1_status, "
"managers_1.manager_name AS managers_1_manager_name "
"FROM people AS people_1 JOIN managers AS "
"managers_1 ON people_1.person_id = managers_1.person_id "
"ORDER BY people_1.person_id"
)
def test_load_only_subclass_from_relationship_polymorphic(self):
s = Session()
wp = with_polymorphic(Person, [Manager], flat=True)
q = s.query(Company).join(Company.employees.of_type(wp)).options(
contains_eager(Company.employees.of_type(wp)).
load_only(wp.Manager.status, wp.Manager.manager_name)
)
self.assert_compile(
q,
"SELECT people_1.person_id AS people_1_person_id, "
"people_1.type AS people_1_type, "
"managers_1.person_id AS managers_1_person_id, "
"managers_1.status AS managers_1_status, "
"managers_1.manager_name AS managers_1_manager_name, "
"companies.company_id AS companies_company_id, "
"companies.name AS companies_name "
"FROM companies JOIN (people AS people_1 LEFT OUTER JOIN "
"managers AS managers_1 ON people_1.person_id = "
"managers_1.person_id) ON companies.company_id = "
"people_1.company_id"
)
def test_load_only_subclass_from_relationship(self):
s = Session()
from sqlalchemy import inspect
inspect(Company).add_property("managers", relationship(Manager))
q = s.query(Company).join(Company.managers).options(
contains_eager(Company.managers).
load_only("status", "manager_name")
)
self.assert_compile(
q,
"SELECT companies.company_id AS companies_company_id, "
"companies.name AS companies_name, "
"managers.person_id AS managers_person_id, "
"people.person_id AS people_person_id, "
"people.type AS people_type, "
"managers.status AS managers_status, "
"managers.manager_name AS managers_manager_name "
"FROM companies JOIN (people JOIN managers ON people.person_id = "
"managers.person_id) ON companies.company_id = people.company_id"
)
def test_defer_on_wildcard_subclass(self):
# pretty much the same as load_only except doesn't
# exclude the primary key
s = Session()
q = s.query(Manager).options(
defer(".*"), undefer("status"))
self.assert_compile(
q,
"SELECT managers.status AS managers_status "
"FROM people JOIN managers ON "
"people.person_id = managers.person_id ORDER BY people.person_id"
)
def test_defer_super_name_on_subclass(self):
s = Session()
q = s.query(Manager).options(defer("name"))
self.assert_compile(
q,
"SELECT managers.person_id AS managers_person_id, "
"people.person_id AS people_person_id, "
"people.company_id AS people_company_id, "
"people.type AS people_type, managers.status AS managers_status, "
"managers.manager_name AS managers_manager_name "
"FROM people JOIN managers "
"ON people.person_id = managers.person_id "
"ORDER BY people.person_id"
)
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