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from decimal import Decimal
import sqlalchemy as sa
from sqlalchemy_utils.aggregates import aggregated
from tests import TestCase
class TestLazyEvaluatedSelectExpressionsForAggregates(TestCase):
dns = 'postgres://postgres@localhost/sqlalchemy_utils_test'
def create_models(self):
class Catalog(self.Base):
__tablename__ = 'catalog'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
type = sa.Column(sa.Unicode(255))
__mapper_args__ = {
'polymorphic_on': type
}
@aggregated('products', sa.Column(sa.Numeric, default=0))
def net_worth(self):
return sa.func.sum(Product.price)
products = sa.orm.relationship('Product', backref='catalog')
class CostumeCatalog(Catalog):
__tablename__ = 'costume_catalog'
id = sa.Column(
sa.Integer, sa.ForeignKey(Catalog.id), primary_key=True
)
__mapper_args__ = {
'polymorphic_identity': 'costumes',
}
class CarCatalog(Catalog):
__tablename__ = 'car_catalog'
id = sa.Column(
sa.Integer, sa.ForeignKey(Catalog.id), primary_key=True
)
__mapper_args__ = {
'polymorphic_identity': 'cars',
}
class Product(self.Base):
__tablename__ = 'product'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
price = sa.Column(sa.Numeric)
catalog_id = sa.Column(sa.Integer, sa.ForeignKey('catalog.id'))
self.Catalog = Catalog
self.CostumeCatalog = CostumeCatalog
self.CarCatalog = CarCatalog
self.Product = Product
def test_columns_inherited_from_parent(self):
assert self.CarCatalog.net_worth
assert self.CostumeCatalog.net_worth
assert self.Catalog.net_worth
assert not hasattr(self.CarCatalog.__table__.c, 'net_worth')
assert not hasattr(self.CostumeCatalog.__table__.c, 'net_worth')
def test_assigns_aggregates_on_insert(self):
catalog = self.Catalog(
name=u'Some catalog'
)
self.session.add(catalog)
self.session.commit()
product = self.Product(
name=u'Some product',
price=Decimal('1000'),
catalog=catalog
)
self.session.add(product)
self.session.commit()
self.session.refresh(catalog)
assert catalog.net_worth == Decimal('1000')
def test_assigns_aggregates_on_update(self):
catalog = self.Catalog(
name=u'Some catalog'
)
self.session.add(catalog)
self.session.commit()
product = self.Product(
name=u'Some product',
price=Decimal('1000'),
catalog=catalog
)
self.session.add(product)
self.session.commit()
product.price = Decimal('500')
self.session.commit()
self.session.refresh(catalog)
assert catalog.net_worth == Decimal('500')
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