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from decimal import Decimal
import pytest
import sqlalchemy as sa
from sqlalchemy_utils.aggregates import aggregated
@pytest.fixture
def Product(Base):
class Product(Base):
__tablename__ = 'product'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
price = sa.Column(sa.Numeric)
type = sa.Column(sa.String(255))
__mapper_args__ = {
'polymorphic_on': type,
'polymorphic_identity': 'simple'
}
catalog_id = sa.Column(sa.Integer, sa.ForeignKey('catalog.id'))
return Product
@pytest.fixture(params=['simple', 'child'])
def AnyProduct(Product, request):
if request.param == 'simple':
return Product
class ChildProduct(Product):
__tablename__ = 'child_product'
id = sa.Column(
sa.Integer, sa.ForeignKey(Product.id), primary_key=True
)
__mapper_args__ = {
'polymorphic_identity': 'child',
}
return ChildProduct
@pytest.fixture
def Catalog(Base, Product):
class Catalog(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')
return Catalog
@pytest.fixture
def CostumeCatalog(Catalog):
class CostumeCatalog(Catalog):
__tablename__ = 'costume_catalog'
id = sa.Column(
sa.Integer, sa.ForeignKey(Catalog.id), primary_key=True
)
__mapper_args__ = {
'polymorphic_identity': 'costumes',
}
return CostumeCatalog
@pytest.fixture
def CarCatalog(Catalog):
class CarCatalog(Catalog):
__tablename__ = 'car_catalog'
id = sa.Column(
sa.Integer, sa.ForeignKey(Catalog.id), primary_key=True
)
__mapper_args__ = {
'polymorphic_identity': 'cars',
}
return CarCatalog
@pytest.fixture
def init_models(AnyProduct, Catalog, CostumeCatalog, CarCatalog):
pass
@pytest.mark.usefixtures('postgresql_dsn')
class TestLazyEvaluatedSelectExpressionsForAggregates:
def test_columns_inherited_from_parent(
self,
Catalog,
CarCatalog,
CostumeCatalog
):
assert CarCatalog.net_worth
assert CostumeCatalog.net_worth
assert Catalog.net_worth
assert not hasattr(CarCatalog.__table__.c, 'net_worth')
assert not hasattr(CostumeCatalog.__table__.c, 'net_worth')
def test_assigns_aggregates_on_insert(self, session, AnyProduct, Catalog):
catalog = Catalog(
name='Some catalog'
)
session.add(catalog)
session.commit()
product = AnyProduct(
name='Some product',
price=Decimal('1000'),
catalog=catalog
)
session.add(product)
session.commit()
session.refresh(catalog)
assert catalog.net_worth == Decimal('1000')
def test_assigns_aggregates_on_update(self, session, Catalog, AnyProduct):
catalog = Catalog(
name='Some catalog'
)
session.add(catalog)
session.commit()
product = AnyProduct(
name='Some product',
price=Decimal('1000'),
catalog=catalog
)
session.add(product)
session.commit()
product.price = Decimal('500')
session.commit()
session.refresh(catalog)
assert catalog.net_worth == Decimal('500')
|
