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import sqlalchemy as sa
from sqlalchemy_utils import aggregated
from tests import TestCase
class Test3LevelDeepOneToMany(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)
@aggregated(
'categories.sub_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)
catalog_id = sa.Column(sa.Integer, sa.ForeignKey('catalog.id'))
sub_categories = sa.orm.relationship(
'SubCategory', backref='category'
)
class SubCategory(self.Base):
__tablename__ = 'sub_category'
id = sa.Column(sa.Integer, primary_key=True)
category_id = sa.Column(sa.Integer, sa.ForeignKey('category.id'))
products = sa.orm.relationship('Product', backref='sub_category')
class Product(self.Base):
__tablename__ = 'product'
id = sa.Column(sa.Integer, primary_key=True)
price = sa.Column(sa.Numeric)
sub_category_id = sa.Column(
sa.Integer, sa.ForeignKey('sub_category.id')
)
self.Catalog = Catalog
self.Category = Category
self.SubCategory = SubCategory
self.Product = Product
def test_assigns_aggregates(self):
catalog = self.catalog_factory()
self.session.commit()
self.session.refresh(catalog)
assert catalog.product_count == 1
def catalog_factory(self):
product = self.Product()
sub_category = self.SubCategory(
products=[product]
)
category = self.Category(sub_categories=[sub_category])
catalog = self.Catalog(categories=[category])
self.session.add(catalog)
return catalog
def test_only_updates_affected_aggregates(self):
catalog = self.catalog_factory()
catalog2 = self.catalog_factory()
self.session.commit()
# force set catalog2 product_count to zero in order to check if it gets
# updated when the other catalog's product count gets updated
self.session.execute(
'UPDATE catalog SET product_count = 0 WHERE id = %d'
% catalog2.id
)
catalog.categories[0].sub_categories[0].products.append(
self.Product()
)
self.session.commit()
self.session.refresh(catalog)
self.session.refresh(catalog2)
assert catalog.product_count == 2
assert catalog2.product_count == 0
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