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import sqlalchemy as sa
from sqlalchemy_utils.aggregates import aggregated
from tests import TestCase
class TestAggregatesWithManyToManyRelationships(TestCase):
dns = 'postgres://postgres@localhost/sqlalchemy_utils_test'
def create_models(self):
user_group = sa.Table(
'user_group',
self.Base.metadata,
sa.Column('user_id', sa.Integer, sa.ForeignKey('user.id')),
sa.Column('group_id', sa.Integer, sa.ForeignKey('group.id'))
)
class User(self.Base):
__tablename__ = 'user'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
@aggregated('groups', sa.Column(sa.Integer, default=0))
def group_count(self):
return sa.func.count('1')
groups = sa.orm.relationship(
'Group',
backref='users',
secondary=user_group
)
class Group(self.Base):
__tablename__ = 'group'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
self.User = User
self.Group = Group
def test_assigns_aggregates_on_insert(self):
user = self.User(
name=u'John Matrix'
)
self.session.add(user)
self.session.commit()
group = self.Group(
name=u'Some group',
users=[user]
)
self.session.add(group)
self.session.commit()
self.session.refresh(user)
assert user.group_count == 1
def test_updates_aggregates_on_delete(self):
user = self.User(
name=u'John Matrix'
)
self.session.add(user)
self.session.commit()
group = self.Group(
name=u'Some group',
users=[user]
)
self.session.add(group)
self.session.commit()
self.session.refresh(user)
user.groups = []
self.session.commit()
self.session.refresh(user)
assert user.group_count == 0
|
