66 lines
2.0 KiB
Python
66 lines
2.0 KiB
Python
from decimal import Decimal
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import sqlalchemy as sa
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from sqlalchemy_utils.aggregates import aggregated
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from tests import TestCase
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class TestLazyEvaluatedSelectExpressionsForAggregates(TestCase):
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dns = 'postgres://postgres@localhost/sqlalchemy_utils_test'
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def create_models(self):
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class Catalog(self.Base):
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__tablename__ = 'catalog'
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id = sa.Column(sa.Integer, primary_key=True)
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name = sa.Column(sa.Unicode(255))
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@aggregated('products', sa.Column(sa.Numeric, default=0))
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def net_worth(self):
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return sa.func.sum(Product.price)
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products = sa.orm.relationship('Product', backref='catalog')
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class Product(self.Base):
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__tablename__ = 'product'
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id = sa.Column(sa.Integer, primary_key=True)
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name = sa.Column(sa.Unicode(255))
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price = sa.Column(sa.Numeric)
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catalog_id = sa.Column(sa.Integer, sa.ForeignKey('catalog.id'))
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self.Catalog = Catalog
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self.Product = Product
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def test_assigns_aggregates_on_insert(self):
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catalog = self.Catalog(
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name=u'Some catalog'
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)
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self.session.add(catalog)
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self.session.commit()
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product = self.Product(
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name=u'Some product',
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price=Decimal('1000'),
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catalog=catalog
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)
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self.session.add(product)
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self.session.commit()
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self.session.refresh(catalog)
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assert catalog.net_worth == Decimal('1000')
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def test_assigns_aggregates_on_update(self):
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catalog = self.Catalog(
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name=u'Some catalog'
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)
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self.session.add(catalog)
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self.session.commit()
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product = self.Product(
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name=u'Some product',
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price=Decimal('1000'),
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catalog=catalog
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)
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self.session.add(product)
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self.session.commit()
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product.price = Decimal('500')
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self.session.commit()
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self.session.refresh(catalog)
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assert catalog.net_worth == Decimal('500')
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