mirror of
https://github.com/sqlalchemy/sqlalchemy.git
synced 2026-06-04 06:48:27 -04:00
Mike Bayer
5508388f03
``cascade="all, delete-orphan"`` automatically on a one-to-many relationship/backref where the foreign key is detected as containing one or more non-nullable columns. This argument is present in the keywords passed to :func:`.automap.generate_relationship` in this case and can still be overridden. Additionally, if the :class:`.ForeignKeyConstraint` specifies ``ondelete="CASCADE"`` for a non-nullable or ``ondelete="SET NULL"`` for a nullable set of columns, the argument ``passive_deletes=True`` is also added to the relationship. Note that not all backends support reflection of ondelete, but backends that do include Postgresql and MySQL. fixes #3210
306 lines
9.1 KiB
Python
306 lines
9.1 KiB
Python
from sqlalchemy.testing import fixtures
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from ..orm._fixtures import FixtureTest
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from sqlalchemy.ext.automap import automap_base
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from sqlalchemy.orm import relationship, interfaces, configure_mappers
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from sqlalchemy.ext.automap import generate_relationship
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from sqlalchemy.testing.mock import Mock
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from sqlalchemy import String, Integer, ForeignKey
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from sqlalchemy import testing
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from sqlalchemy.testing.schema import Table, Column
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class AutomapTest(fixtures.MappedTest):
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@classmethod
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def define_tables(cls, metadata):
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FixtureTest.define_tables(metadata)
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def test_relationship_o2m_default(self):
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Base = automap_base(metadata=self.metadata)
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Base.prepare()
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User = Base.classes.users
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Address = Base.classes.addresses
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a1 = Address(email_address='e1')
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u1 = User(name='u1', addresses_collection=[a1])
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assert a1.users is u1
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def test_relationship_explicit_override_o2m(self):
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Base = automap_base(metadata=self.metadata)
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prop = relationship("addresses", collection_class=set)
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class User(Base):
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__tablename__ = 'users'
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addresses_collection = prop
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Base.prepare()
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assert User.addresses_collection.property is prop
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Address = Base.classes.addresses
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a1 = Address(email_address='e1')
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u1 = User(name='u1', addresses_collection=set([a1]))
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assert a1.user is u1
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def test_relationship_explicit_override_m2o(self):
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Base = automap_base(metadata=self.metadata)
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prop = relationship("users")
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class Address(Base):
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__tablename__ = 'addresses'
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users = prop
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Base.prepare()
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User = Base.classes.users
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assert Address.users.property is prop
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a1 = Address(email_address='e1')
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u1 = User(name='u1', address_collection=[a1])
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assert a1.users is u1
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def test_relationship_self_referential(self):
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Base = automap_base(metadata=self.metadata)
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Base.prepare()
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Node = Base.classes.nodes
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n1 = Node()
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n2 = Node()
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n1.nodes_collection.append(n2)
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assert n2.nodes is n1
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def test_naming_schemes(self):
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Base = automap_base(metadata=self.metadata)
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def classname_for_table(base, tablename, table):
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return str("cls_" + tablename)
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def name_for_scalar_relationship(
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base, local_cls, referred_cls, constraint):
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return "scalar_" + referred_cls.__name__
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def name_for_collection_relationship(
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base, local_cls, referred_cls, constraint):
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return "coll_" + referred_cls.__name__
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Base.prepare(
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classname_for_table=classname_for_table,
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name_for_scalar_relationship=name_for_scalar_relationship,
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name_for_collection_relationship=name_for_collection_relationship
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)
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User = Base.classes.cls_users
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Address = Base.classes.cls_addresses
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u1 = User()
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a1 = Address()
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u1.coll_cls_addresses.append(a1)
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assert a1.scalar_cls_users is u1
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def test_relationship_m2m(self):
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Base = automap_base(metadata=self.metadata)
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Base.prepare()
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Order, Item = Base.classes.orders, Base.classes['items']
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o1 = Order()
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i1 = Item()
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o1.items_collection.append(i1)
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assert o1 in i1.orders_collection
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def test_relationship_explicit_override_forwards_m2m(self):
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Base = automap_base(metadata=self.metadata)
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class Order(Base):
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__tablename__ = 'orders'
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items_collection = relationship(
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"items",
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secondary="order_items",
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collection_class=set)
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Base.prepare()
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Item = Base.classes['items']
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o1 = Order()
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i1 = Item()
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o1.items_collection.add(i1)
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# it is 'order_collection' because the class name is
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# "Order" !
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assert isinstance(i1.order_collection, list)
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assert o1 in i1.order_collection
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def test_relationship_pass_params(self):
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Base = automap_base(metadata=self.metadata)
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mock = Mock()
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def _gen_relationship(
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base, direction, return_fn, attrname,
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local_cls, referred_cls, **kw):
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mock(base, direction, attrname)
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return generate_relationship(
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base, direction, return_fn,
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attrname, local_cls, referred_cls, **kw)
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Base.prepare(generate_relationship=_gen_relationship)
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assert set(tuple(c[1]) for c in mock.mock_calls).issuperset([
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(Base, interfaces.MANYTOONE, "nodes"),
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(Base, interfaces.MANYTOMANY, "keywords_collection"),
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(Base, interfaces.MANYTOMANY, "items_collection"),
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(Base, interfaces.MANYTOONE, "users"),
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(Base, interfaces.ONETOMANY, "addresses_collection"),
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])
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class CascadeTest(fixtures.MappedTest):
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@classmethod
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def define_tables(cls, metadata):
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Table(
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"a", metadata,
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Column('id', Integer, primary_key=True)
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)
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Table(
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"b", metadata,
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Column('id', Integer, primary_key=True),
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Column('aid', ForeignKey('a.id'), nullable=True)
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)
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Table(
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"c", metadata,
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Column('id', Integer, primary_key=True),
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Column('aid', ForeignKey('a.id'), nullable=False)
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)
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Table(
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"d", metadata,
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Column('id', Integer, primary_key=True),
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Column(
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'aid', ForeignKey('a.id', ondelete="cascade"), nullable=False)
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)
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Table(
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"e", metadata,
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Column('id', Integer, primary_key=True),
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Column(
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'aid', ForeignKey('a.id', ondelete="set null"),
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nullable=True)
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)
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def test_o2m_relationship_cascade(self):
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Base = automap_base(metadata=self.metadata)
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Base.prepare()
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configure_mappers()
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b_rel = Base.classes.a.b_collection
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assert not b_rel.property.cascade.delete
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assert not b_rel.property.cascade.delete_orphan
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assert not b_rel.property.passive_deletes
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assert b_rel.property.cascade.save_update
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c_rel = Base.classes.a.c_collection
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assert c_rel.property.cascade.delete
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assert c_rel.property.cascade.delete_orphan
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assert not c_rel.property.passive_deletes
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assert c_rel.property.cascade.save_update
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d_rel = Base.classes.a.d_collection
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assert d_rel.property.cascade.delete
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assert d_rel.property.cascade.delete_orphan
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assert d_rel.property.passive_deletes
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assert d_rel.property.cascade.save_update
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e_rel = Base.classes.a.e_collection
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assert not e_rel.property.cascade.delete
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assert not e_rel.property.cascade.delete_orphan
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assert e_rel.property.passive_deletes
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assert e_rel.property.cascade.save_update
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class AutomapInhTest(fixtures.MappedTest):
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@classmethod
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def define_tables(cls, metadata):
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Table(
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'single', metadata,
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Column('id', Integer, primary_key=True),
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Column('type', String(10)),
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test_needs_fk=True
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)
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Table(
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'joined_base', metadata,
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Column('id', Integer, primary_key=True),
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Column('type', String(10)),
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test_needs_fk=True
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)
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Table(
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'joined_inh', metadata,
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Column(
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'id', Integer,
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ForeignKey('joined_base.id'), primary_key=True),
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test_needs_fk=True
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)
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FixtureTest.define_tables(metadata)
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def test_single_inheritance_reflect(self):
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Base = automap_base()
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class Single(Base):
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__tablename__ = 'single'
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type = Column(String)
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__mapper_args__ = {
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"polymorphic_identity": "u0",
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"polymorphic_on": type}
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class SubUser1(Single):
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__mapper_args__ = {"polymorphic_identity": "u1"}
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class SubUser2(Single):
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__mapper_args__ = {"polymorphic_identity": "u2"}
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Base.prepare(engine=testing.db, reflect=True)
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assert SubUser2.__mapper__.inherits is Single.__mapper__
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def test_joined_inheritance_reflect(self):
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Base = automap_base()
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class Joined(Base):
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__tablename__ = 'joined_base'
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type = Column(String)
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__mapper_args__ = {
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"polymorphic_identity": "u0",
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"polymorphic_on": type}
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class SubJoined(Joined):
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__tablename__ = 'joined_inh'
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__mapper_args__ = {"polymorphic_identity": "u1"}
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Base.prepare(engine=testing.db, reflect=True)
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assert SubJoined.__mapper__.inherits is Joined.__mapper__
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assert not Joined.__mapper__.relationships
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assert not SubJoined.__mapper__.relationships
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def test_conditional_relationship(self):
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Base = automap_base()
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def _gen_relationship(*arg, **kw):
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return None
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Base.prepare(
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engine=testing.db, reflect=True,
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generate_relationship=_gen_relationship)
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