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from sqlalchemy import *
from sqlalchemy.orm import *
from sqlalchemy.test import testing
from test.orm._fixtures import Base
from test.orm._base import MappedTest
class InheritingSelectablesTest(MappedTest):
@classmethod
def define_tables(cls, metadata):
global foo, bar, baz
foo = Table('foo', metadata,
Column('a', String(30), primary_key=1),
Column('b', String(30), nullable=0))
bar = foo.select(foo.c.b == 'bar').alias('bar')
baz = foo.select(foo.c.b == 'baz').alias('baz')
def test_load(self):
# TODO: add persistence test also
testing.db.execute(foo.insert(), a='not bar', b='baz')
testing.db.execute(foo.insert(), a='also not bar', b='baz')
testing.db.execute(foo.insert(), a='i am bar', b='bar')
testing.db.execute(foo.insert(), a='also bar', b='bar')
class Foo(Base): pass
class Bar(Foo): pass
class Baz(Foo): pass
mapper(Foo, foo, polymorphic_on=foo.c.b)
mapper(Baz, baz,
with_polymorphic=('*', foo.join(baz, foo.c.b=='baz').alias('baz')),
inherits=Foo,
inherit_condition=(foo.c.a==baz.c.a),
inherit_foreign_keys=[baz.c.a],
polymorphic_identity='baz')
mapper(Bar, bar,
with_polymorphic=('*', foo.join(bar, foo.c.b=='bar').alias('bar')),
inherits=Foo,
inherit_condition=(foo.c.a==bar.c.a),
inherit_foreign_keys=[bar.c.a],
polymorphic_identity='bar')
s = sessionmaker(bind=testing.db)()
assert [Baz(), Baz(), Bar(), Bar()] == s.query(Foo).order_by(Foo.b.desc()).all()
assert [Bar(), Bar()] == s.query(Bar).all()
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