84 lines
2.7 KiB
Python
84 lines
2.7 KiB
Python
import sqlalchemy as sa
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from sqlalchemy_utils.observer import observes
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from tests import TestCase
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class TestObservesForOneToOneToOneToOne(TestCase):
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dns = 'postgres://postgres@localhost/sqlalchemy_utils_test'
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def create_models(self):
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class Catalog(self.Base):
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__tablename__ = 'catalog'
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id = sa.Column(sa.Integer, primary_key=True)
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product_price = sa.Column(sa.Integer)
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@observes('category.sub_category.product')
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def product_observer(self, product):
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self.product_price = product.price if product else None
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category = sa.orm.relationship(
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'Category',
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uselist=False,
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backref='catalog'
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)
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class Category(self.Base):
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__tablename__ = 'category'
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id = sa.Column(sa.Integer, primary_key=True)
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catalog_id = sa.Column(sa.Integer, sa.ForeignKey('catalog.id'))
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sub_category = sa.orm.relationship(
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'SubCategory',
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uselist=False,
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backref='category'
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)
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class SubCategory(self.Base):
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__tablename__ = 'sub_category'
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id = sa.Column(sa.Integer, primary_key=True)
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category_id = sa.Column(sa.Integer, sa.ForeignKey('category.id'))
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product = sa.orm.relationship(
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'Product',
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uselist=False,
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backref='sub_category'
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)
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class Product(self.Base):
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__tablename__ = 'product'
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id = sa.Column(sa.Integer, primary_key=True)
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price = sa.Column(sa.Integer)
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sub_category_id = sa.Column(
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sa.Integer, sa.ForeignKey('sub_category.id')
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)
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self.Catalog = Catalog
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self.Category = Category
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self.SubCategory = SubCategory
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self.Product = Product
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def create_catalog(self):
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sub_category = self.SubCategory(product=self.Product(price=123))
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category = self.Category(sub_category=sub_category)
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catalog = self.Catalog(category=category)
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self.session.add(catalog)
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self.session.flush()
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return catalog
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def test_simple_insert(self):
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catalog = self.create_catalog()
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assert catalog.product_price == 123
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def test_replace_leaf_object(self):
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catalog = self.create_catalog()
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product = self.Product(price=44)
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catalog.category.sub_category.product = product
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self.session.flush()
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assert catalog.product_price == 44
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def test_delete_leaf_object(self):
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catalog = self.create_catalog()
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self.session.delete(catalog.category.sub_category.product)
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self.session.flush()
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assert catalog.product_price is None
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