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"""Generic mapping to Select statements"""
from sqlalchemy.test.testing import assert_raises, assert_raises_message
import sqlalchemy as sa
from sqlalchemy.test import testing
from sqlalchemy import String, Integer, select
from sqlalchemy.test.schema import Table, Column
from sqlalchemy.orm import mapper, create_session
from sqlalchemy.test.testing import eq_
from test.orm import _base
# TODO: more tests mapping to selects
class SelectableNoFromsTest(_base.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table('common', metadata,
Column('id', Integer, primary_key=True, test_needs_autoincrement=True),
Column('data', Integer),
Column('extra', String(45)))
@classmethod
def setup_classes(cls):
class Subset(_base.ComparableEntity):
pass
@testing.resolve_artifact_names
def test_no_tables(self):
selectable = select(["x", "y", "z"]).alias()
assert_raises_message(sa.exc.InvalidRequestError,
"Could not find any Table objects",
mapper, Subset, selectable)
@testing.resolve_artifact_names
def test_no_selects(self):
subset_select = select([common.c.id, common.c.data])
assert_raises(sa.exc.InvalidRequestError, mapper, Subset, subset_select)
@testing.resolve_artifact_names
def test_basic(self):
subset_select = select([common.c.id, common.c.data]).alias()
subset_mapper = mapper(Subset, subset_select)
sess = create_session(bind=testing.db)
sess.add(Subset(data=1))
sess.flush()
sess.expunge_all()
eq_(sess.query(Subset).all(), [Subset(data=1)])
eq_(sess.query(Subset).filter(Subset.data==1).one(), Subset(data=1))
eq_(sess.query(Subset).filter(Subset.data!=1).first(), None)
subset_select = sa.orm.class_mapper(Subset).mapped_table
eq_(sess.query(Subset).filter(subset_select.c.data==1).one(),
Subset(data=1))
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