108 lines
3.6 KiB
Python
108 lines
3.6 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 TestObservesFor3LevelDeepOneToMany(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_count = sa.Column(sa.Integer, default=0)
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@observes('categories.sub_categories.products')
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def product_observer(self, products):
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self.product_count = len(products)
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categories = sa.orm.relationship('Category', backref='catalog')
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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_categories = sa.orm.relationship(
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'SubCategory', 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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products = sa.orm.relationship(
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'Product',
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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.Numeric)
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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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def __repr__(self):
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return '<Product id=%r>' % self.id
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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(products=[self.Product()])
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category = self.Category(sub_categories=[sub_category])
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catalog = self.Catalog(categories=[category])
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self.session.add(catalog)
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self.session.commit()
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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_count == 1
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def test_add_leaf_object(self):
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catalog = self.create_catalog()
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product = self.Product()
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catalog.categories[0].sub_categories[0].products.append(product)
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self.session.flush()
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assert catalog.product_count == 2
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def test_remove_leaf_object(self):
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catalog = self.create_catalog()
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product = self.Product()
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catalog.categories[0].sub_categories[0].products.append(product)
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self.session.flush()
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self.session.delete(product)
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self.session.commit()
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assert catalog.product_count == 1
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self.session.delete(
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catalog.categories[0].sub_categories[0].products[0]
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)
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self.session.commit()
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assert catalog.product_count == 0
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def test_delete_intermediate_object(self):
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catalog = self.create_catalog()
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self.session.delete(catalog.categories[0].sub_categories[0])
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self.session.commit()
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assert catalog.product_count == 0
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def test_gathered_objects_are_distinct(self):
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catalog = self.Catalog()
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category = self.Category(catalog=catalog)
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product = self.Product()
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category.sub_categories.append(
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self.SubCategory(products=[product])
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)
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self.session.add(
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self.SubCategory(category=category, products=[product])
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)
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self.session.commit()
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assert catalog.product_count == 1
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