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from sqlalchemy import ForeignKey
from sqlalchemy import Integer
from sqlalchemy import select
from sqlalchemy import String
from sqlalchemy.orm import Session
from sqlalchemy.testing import eq_
from sqlalchemy.testing import fixtures
from sqlalchemy.testing.entities import ComparableEntity
from sqlalchemy.testing.fixtures import fixture_session
from sqlalchemy.testing.schema import Column
from sqlalchemy.testing.schema import Table
class InheritingSelectablesTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
foo = Table(
"foo",
metadata,
Column("a", String(30), primary_key=1),
Column("b", String(30), nullable=0),
)
cls.tables.bar = foo.select().where(foo.c.b == "bar").alias("bar")
cls.tables.baz = foo.select().where(foo.c.b == "baz").alias("baz")
def test_load(self, connection):
foo, bar, baz = self.tables.foo, self.tables.bar, self.tables.baz
# TODO: add persistence test also
connection.execute(foo.insert(), dict(a="not bar", b="baz"))
connection.execute(foo.insert(), dict(a="also not bar", b="baz"))
connection.execute(foo.insert(), dict(a="i am bar", b="bar"))
connection.execute(foo.insert(), dict(a="also bar", b="bar"))
class Foo(ComparableEntity):
pass
class Bar(Foo):
pass
class Baz(Foo):
pass
self.mapper_registry.map_imperatively(Foo, foo, polymorphic_on=foo.c.b)
self.mapper_registry.map_imperatively(
Baz,
baz,
with_polymorphic=(
"*",
foo.join(baz, foo.c.b == "baz").select().subquery("baz"),
),
inherits=Foo,
inherit_condition=(foo.c.a == baz.c.a),
inherit_foreign_keys=[baz.c.a],
polymorphic_identity="baz",
)
self.mapper_registry.map_imperatively(
Bar,
bar,
with_polymorphic=(
"*",
foo.join(bar, foo.c.b == "bar").select().subquery("bar"),
),
inherits=Foo,
inherit_condition=(foo.c.a == bar.c.a),
inherit_foreign_keys=[bar.c.a],
polymorphic_identity="bar",
)
s = Session(connection)
eq_(s.query(Bar).all(), [Bar(), Bar()])
class JoinFromSelectPersistenceTest(fixtures.MappedTest):
"""test for [ticket:2885]"""
@classmethod
def define_tables(cls, metadata):
Table(
"base",
metadata,
Column(
"id", Integer, primary_key=True, test_needs_autoincrement=True
),
Column("type", String(50)),
)
Table(
"child",
metadata,
# 1. name of column must be different, so that we rely on
# mapper._table_to_equated to link the two cols
Column(
"child_id", Integer, ForeignKey("base.id"), primary_key=True
),
Column("name", String(50)),
)
@classmethod
def setup_classes(cls):
class Base(cls.Comparable):
pass
class Child(Base):
pass
def test_map_to_select(self):
Base, Child = self.classes.Base, self.classes.Child
base, child = self.tables.base, self.tables.child
base_select = select(base).alias()
self.mapper_registry.map_imperatively(
Base,
base_select,
polymorphic_on=base_select.c.type,
polymorphic_identity="base",
)
self.mapper_registry.map_imperatively(
Child, child, inherits=Base, polymorphic_identity="child"
)
sess = fixture_session()
# 2. use an id other than "1" here so can't rely on
# the two inserts having the same id
c1 = Child(id=12, name="c1")
sess.add(c1)
sess.commit()
sess.close()
c1 = sess.query(Child).one()
eq_(c1.name, "c1")
|
