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from sqlalchemy import exc
from sqlalchemy import func
from sqlalchemy import select
from sqlalchemy import testing
from sqlalchemy import update
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy.ext.asyncio import create_async_engine
from sqlalchemy.orm import selectinload
from sqlalchemy.testing import async_test
from sqlalchemy.testing import eq_
from sqlalchemy.testing import is_
from ...orm import _fixtures
class AsyncFixture(_fixtures.FixtureTest):
__requires__ = ("async_dialect",)
@classmethod
def setup_mappers(cls):
cls._setup_stock_mapping()
@testing.fixture
def async_engine(self):
return create_async_engine(testing.db.url)
@testing.fixture
def async_session(self, async_engine):
return AsyncSession(async_engine)
class AsyncSessionTest(AsyncFixture):
def test_requires_async_engine(self, async_engine):
testing.assert_raises_message(
exc.ArgumentError,
"AsyncEngine expected, got Engine",
AsyncSession,
bind=async_engine.sync_engine,
)
class AsyncSessionQueryTest(AsyncFixture):
@async_test
async def test_execute(self, async_session):
User = self.classes.User
stmt = (
select(User)
.options(selectinload(User.addresses))
.order_by(User.id)
)
result = await async_session.execute(stmt)
eq_(result.scalars().all(), self.static.user_address_result)
@async_test
async def test_stream_partitions(self, async_session):
User = self.classes.User
stmt = (
select(User)
.options(selectinload(User.addresses))
.order_by(User.id)
)
result = await async_session.stream(stmt)
assert_result = []
async for partition in result.scalars().partitions(3):
assert_result.append(partition)
eq_(
assert_result,
[
self.static.user_address_result[0:3],
self.static.user_address_result[3:],
],
)
class AsyncSessionTransactionTest(AsyncFixture):
run_inserts = None
@async_test
async def test_trans(self, async_session, async_engine):
async with async_engine.connect() as outer_conn:
User = self.classes.User
async with async_session.begin():
eq_(await outer_conn.scalar(select(func.count(User.id))), 0)
u1 = User(name="u1")
async_session.add(u1)
result = await async_session.execute(select(User))
eq_(result.scalar(), u1)
eq_(await outer_conn.scalar(select(func.count(User.id))), 1)
@async_test
async def test_commit_as_you_go(self, async_session, async_engine):
async with async_engine.connect() as outer_conn:
User = self.classes.User
eq_(await outer_conn.scalar(select(func.count(User.id))), 0)
u1 = User(name="u1")
async_session.add(u1)
result = await async_session.execute(select(User))
eq_(result.scalar(), u1)
await async_session.commit()
eq_(await outer_conn.scalar(select(func.count(User.id))), 1)
@async_test
async def test_trans_noctx(self, async_session, async_engine):
async with async_engine.connect() as outer_conn:
User = self.classes.User
trans = await async_session.begin()
try:
eq_(await outer_conn.scalar(select(func.count(User.id))), 0)
u1 = User(name="u1")
async_session.add(u1)
result = await async_session.execute(select(User))
eq_(result.scalar(), u1)
finally:
await trans.commit()
eq_(await outer_conn.scalar(select(func.count(User.id))), 1)
@async_test
async def test_flush(self, async_session):
User = self.classes.User
async with async_session.begin():
u1 = User(name="u1")
async_session.add(u1)
conn = await async_session.connection()
eq_(await conn.scalar(select(func.count(User.id))), 0)
await async_session.flush()
eq_(await conn.scalar(select(func.count(User.id))), 1)
@async_test
async def test_refresh(self, async_session):
User = self.classes.User
async with async_session.begin():
u1 = User(name="u1")
async_session.add(u1)
await async_session.flush()
conn = await async_session.connection()
await conn.execute(
update(User)
.values(name="u2")
.execution_options(synchronize_session=None)
)
eq_(u1.name, "u1")
await async_session.refresh(u1)
eq_(u1.name, "u2")
eq_(await conn.scalar(select(func.count(User.id))), 1)
@async_test
async def test_merge(self, async_session):
User = self.classes.User
async with async_session.begin():
u1 = User(id=1, name="u1")
async_session.add(u1)
async with async_session.begin():
new_u = User(id=1, name="new u1")
new_u_merged = await async_session.merge(new_u)
is_(new_u_merged, u1)
eq_(u1.name, "new u1")
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