97 lines
3.3 KiB
Python
97 lines
3.3 KiB
Python
import sqlalchemy as sa
|
|
|
|
from sqlalchemy_utils.observer import observes
|
|
from tests import TestCase
|
|
|
|
|
|
class TestObservesForOneToManyToOneToMany(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)
|
|
product_count = sa.Column(sa.Integer, default=0)
|
|
|
|
@observes('categories.sub_category.products')
|
|
def product_observer(self, products):
|
|
self.product_count = len(products)
|
|
|
|
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_category = sa.orm.relationship(
|
|
'SubCategory',
|
|
uselist=False,
|
|
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 create_catalog(self):
|
|
sub_category = self.SubCategory(products=[self.Product()])
|
|
category = self.Category(sub_category=sub_category)
|
|
catalog = self.Catalog(categories=[category])
|
|
self.session.add(catalog)
|
|
self.session.flush()
|
|
return catalog
|
|
|
|
def test_simple_insert(self):
|
|
catalog = self.create_catalog()
|
|
assert catalog.product_count == 1
|
|
|
|
def test_add_leaf_object(self):
|
|
catalog = self.create_catalog()
|
|
product = self.Product()
|
|
catalog.categories[0].sub_category.products.append(product)
|
|
self.session.flush()
|
|
assert catalog.product_count == 2
|
|
|
|
def test_remove_leaf_object(self):
|
|
catalog = self.create_catalog()
|
|
product = self.Product()
|
|
catalog.categories[0].sub_category.products.append(product)
|
|
self.session.flush()
|
|
self.session.delete(product)
|
|
self.session.flush()
|
|
assert catalog.product_count == 1
|
|
|
|
def test_delete_intermediate_object(self):
|
|
catalog = self.create_catalog()
|
|
self.session.delete(catalog.categories[0].sub_category)
|
|
self.session.commit()
|
|
assert catalog.product_count == 0
|
|
|
|
def test_gathered_objects_are_distinct(self):
|
|
catalog = self.Catalog()
|
|
category = self.Category(catalog=catalog)
|
|
product = self.Product()
|
|
category.sub_category = self.SubCategory(products=[product])
|
|
self.session.add(
|
|
self.Category(catalog=catalog, sub_category=category.sub_category)
|
|
)
|
|
self.session.commit()
|
|
assert catalog.product_count == 1
|