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import pytest
import sqlalchemy as sa
from sqlalchemy_utils.aggregates import aggregated
@pytest.fixture
def Thread(Base):
class Thread(Base):
__tablename__ = 'thread'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
@aggregated('comments', sa.Column(sa.Integer, default=0))
def comment_count(self):
return sa.func.count('1')
comments = sa.orm.relationship(
'Comment',
passive_deletes=True,
backref='thread'
)
return Thread
@pytest.fixture
def Comment(Base):
class Comment(Base):
__tablename__ = 'comment'
id = sa.Column(sa.Integer, primary_key=True)
content = sa.Column(sa.Unicode(255))
thread_id = sa.Column(
sa.Integer,
sa.ForeignKey('thread.id', ondelete='CASCADE')
)
return Comment
@pytest.fixture
def init_models(Thread, Comment):
pass
@pytest.mark.usefixtures('postgresql_dsn')
class TestAggregateValueGenerationWithCascadeDelete:
def test_something(self, session, Thread, Comment):
thread = Thread()
thread.name = 'some article name'
session.add(thread)
comment = Comment(content='Some content', thread=thread)
session.add(comment)
session.commit()
session.expire_all()
session.delete(thread)
session.commit()
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