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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)
catalog_id = sa.Column(sa.Integer, sa.ForeignKey('catalog.id'))
return Product
@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))
@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 init_models(Product, Catalog):
pass
@pytest.mark.usefixtures('postgresql_dsn')
class TestLazyEvaluatedSelectExpressionsForAggregates:
def test_assigns_aggregates_on_insert(self, session, Product, Catalog):
catalog = Catalog(
name='Some catalog'
)
session.add(catalog)
session.commit()
product = Product(
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, Product, Catalog):
catalog = Catalog(
name='Some catalog'
)
session.add(catalog)
session.commit()
product = Product(
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')
|
