70 lines
2.0 KiB
Python
70 lines
2.0 KiB
Python
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
|