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from sqlalchemy import String, Integer, ForeignKey, select
from sqlalchemy.orm import mapper, Session
from sqlalchemy import testing
from sqlalchemy.testing import fixtures, eq_
from sqlalchemy.testing.schema import Table, Column
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(foo.c.b == "bar").alias("bar")
cls.tables.baz = foo.select(foo.c.b == "baz").alias("baz")
def test_load(self):
foo, bar, baz = self.tables.foo, self.tables.bar, self.tables.baz
# 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(fixtures.ComparableEntity):
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 = Session()
assert [Baz(), Baz(), Bar(), Bar()] == s.query(Foo).order_by(
Foo.b.desc()
).all()
assert [Bar(), Bar()] == s.query(Bar).all()
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()
mapper(
Base,
base_select,
polymorphic_on=base_select.c.type,
polymorphic_identity="base",
)
mapper(Child, child, inherits=Base, polymorphic_identity="child")
sess = 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")
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