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from decimal import Decimal
import sqlalchemy as sa
from sqlalchemy_utils.aggregates import aggregated
from tests import TestCase
class TestAggregateOneToManyAndOneToMany(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))
@aggregated(
'categories.products',
sa.Column(sa.Integer, default=0)
)
def product_count(self):
return sa.func.count('1')
categories = sa.orm.relationship('Category', backref='catalog')
class Category(self.Base):
__tablename__ = 'category'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
catalog_id = sa.Column(sa.Integer, sa.ForeignKey('catalog.id'))
products = sa.orm.relationship('Product', backref='category')
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)
category_id = sa.Column(sa.Integer, sa.ForeignKey('category.id'))
self.Catalog = Catalog
self.Category = Category
self.Product = Product
def test_assigns_aggregates(self):
category = self.Category(name=u'Some category')
catalog = self.Catalog(
categories=[category]
)
catalog.name = u'Some catalog'
self.session.add(catalog)
self.session.commit()
product = self.Product(
name=u'Some product',
price=Decimal('1000'),
category=category
)
self.session.add(product)
self.session.commit()
self.session.refresh(catalog)
assert catalog.product_count == 1
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