Add tests for aggregates with inheritance

tests/aggregate/test_join_table_inheritance.py

@@ -0,0 +1,90 @@
+from decimal import Decimal
+import sqlalchemy as sa
+from sqlalchemy_utils.aggregates import aggregated
+from tests import TestCase
+
+
+class TestLazyEvaluatedSelectExpressionsForAggregates(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))
+            type = sa.Column(sa.Unicode(255))
+
+            __mapper_args__ = {
+                'polymorphic_on': type
+            }
+
+            @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')
+
+        class CostumeCatalog(Catalog):
+            __tablename__ = 'costume_catalog'
+            id = sa.Column(
+                sa.Integer, sa.ForeignKey(Catalog.id), primary_key=True
+            )
+
+            __mapper_args__ = {
+                'polymorphic_identity': 'costumes',
+            }
+
+        class CarCatalog(Catalog):
+            __tablename__ = 'car_catalog'
+            id = sa.Column(
+                sa.Integer, sa.ForeignKey(Catalog.id), primary_key=True
+            )
+
+            __mapper_args__ = {
+                'polymorphic_identity': 'cars',
+            }
+
+        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'))
+
+        self.Catalog = Catalog
+        self.Product = Product
+
+    def test_assigns_aggregates_on_insert(self):
+        catalog = self.Catalog(
+            name=u'Some catalog'
+        )
+        self.session.add(catalog)
+        self.session.commit()
+        product = self.Product(
+            name=u'Some product',
+            price=Decimal('1000'),
+            catalog=catalog
+        )
+        self.session.add(product)
+        self.session.commit()
+        self.session.refresh(catalog)
+        assert catalog.net_worth == Decimal('1000')
+
+    def test_assigns_aggregates_on_update(self):
+        catalog = self.Catalog(
+            name=u'Some catalog'
+        )
+        self.session.add(catalog)
+        self.session.commit()
+        product = self.Product(
+            name=u'Some product',
+            price=Decimal('1000'),
+            catalog=catalog
+        )
+        self.session.add(product)
+        self.session.commit()
+        product.price = Decimal('500')
+        self.session.commit()
+        self.session.refresh(catalog)
+        assert catalog.net_worth == Decimal('500')