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|
import sqlalchemy as sa
from sqlalchemy_utils import aggregated
from tests import TestCase
class TestAggregateOneToManyAndManyToMany(TestCase):
dns = 'postgres://postgres@localhost/sqlalchemy_utils_test'
def create_models(self):
product_categories = sa.Table(
'category_product',
self.Base.metadata,
sa.Column('category_id', sa.Integer, sa.ForeignKey('category.id')),
sa.Column('product_id', sa.Integer, sa.ForeignKey('product.id'))
)
class Catalog(self.Base):
__tablename__ = 'catalog'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
@aggregated(
'products.categories',
sa.Column(sa.Integer, default=0)
)
def category_count(self):
return sa.func.count(sa.distinct(Category.id))
class Category(self.Base):
__tablename__ = 'category'
id = sa.Column(sa.Integer, primary_key=True)
name = sa.Column(sa.Unicode(255))
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')
)
catalog = sa.orm.relationship(
Catalog,
backref='products'
)
categories = sa.orm.relationship(
Category,
backref='products',
secondary=product_categories
)
self.Catalog = Catalog
self.Category = Category
self.Product = Product
def test_insert(self):
category = self.Category()
products = [
self.Product(categories=[category]),
self.Product(categories=[category])
]
catalog = self.Catalog(products=products)
self.session.add(catalog)
products2 = [
self.Product(categories=[category]),
self.Product(categories=[category])
]
catalog2 = self.Catalog(products=products2)
self.session.add(catalog)
self.session.commit()
assert catalog.category_count == 1
assert catalog2.category_count == 1
|
