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"""Evaluating SQL expressions on ORM objects"""
from sqlalchemy import and_
from sqlalchemy import bindparam
from sqlalchemy import ForeignKey
from sqlalchemy import inspect
from sqlalchemy import Integer
from sqlalchemy import not_
from sqlalchemy import or_
from sqlalchemy import String
from sqlalchemy.orm import evaluator
from sqlalchemy.orm import mapper
from sqlalchemy.orm import relationship
from sqlalchemy.orm import Session
from sqlalchemy.testing import assert_raises_message
from sqlalchemy.testing import expect_warnings
from sqlalchemy.testing import fixtures
from sqlalchemy.testing import is_
from sqlalchemy.testing.schema import Column
from sqlalchemy.testing.schema import Table
compiler = evaluator.EvaluatorCompiler()
def eval_eq(clause, testcases=None):
evaluator = compiler.process(clause)
def testeval(obj=None, expected_result=None):
assert evaluator(obj) == expected_result, "%s != %r for %s with %r" % (
evaluator(obj),
expected_result,
clause,
obj,
)
if testcases:
for an_obj, result in testcases:
testeval(an_obj, result)
return testeval
class EvaluateTest(fixtures.MappedTest):
@classmethod
def define_tables(cls, metadata):
Table(
"users",
metadata,
Column("id", Integer, primary_key=True),
Column("name", String(64)),
Column("othername", String(64)),
)
@classmethod
def setup_classes(cls):
class User(cls.Basic):
pass
@classmethod
def setup_mappers(cls):
users, User = cls.tables.users, cls.classes.User
mapper(User, users)
def test_compare_to_value(self):
User = self.classes.User
eval_eq(
User.name == "foo",
testcases=[
(User(name="foo"), True),
(User(name="bar"), False),
(User(name=None), None),
],
)
eval_eq(
User.id < 5,
testcases=[
(User(id=3), True),
(User(id=5), False),
(User(id=None), None),
],
)
def test_compare_to_callable_bind(self):
User = self.classes.User
eval_eq(
User.name == bindparam("x", callable_=lambda: "foo"),
testcases=[
(User(name="foo"), True),
(User(name="bar"), False),
(User(name=None), None),
],
)
def test_compare_to_none(self):
User = self.classes.User
eval_eq(
User.name == None, # noqa
testcases=[(User(name="foo"), False), (User(name=None), True)],
)
def test_warn_on_unannotated_matched_column(self):
User = self.classes.User
compiler = evaluator.EvaluatorCompiler(User)
with expect_warnings(
r"Evaluating non-mapped column expression 'othername' "
"onto ORM instances; this is a deprecated use case."
):
meth = compiler.process(User.name == Column("othername", String))
u1 = User(id=5)
meth(u1)
def test_raise_on_unannotated_unmatched_column(self):
User = self.classes.User
compiler = evaluator.EvaluatorCompiler(User)
assert_raises_message(
evaluator.UnevaluatableError,
"Cannot evaluate column: foo",
compiler.process,
User.id == Column("foo", Integer),
)
# if we let the above method through as we did
# prior to [ticket:3366], we would get
# AttributeError: 'User' object has no attribute 'foo'
# u1 = User(id=5)
# meth(u1)
def test_true_false(self):
User = self.classes.User
eval_eq(
User.name == False, # noqa
testcases=[
(User(name="foo"), False),
(User(name=True), False),
(User(name=False), True),
],
)
eval_eq(
User.name == True, # noqa
testcases=[
(User(name="foo"), False),
(User(name=True), True),
(User(name=False), False),
],
)
def test_boolean_ops(self):
User = self.classes.User
eval_eq(
and_(User.name == "foo", User.id == 1),
testcases=[
(User(id=1, name="foo"), True),
(User(id=2, name="foo"), False),
(User(id=1, name="bar"), False),
(User(id=2, name="bar"), False),
(User(id=1, name=None), None),
],
)
eval_eq(
or_(User.name == "foo", User.id == 1),
testcases=[
(User(id=1, name="foo"), True),
(User(id=2, name="foo"), True),
(User(id=1, name="bar"), True),
(User(id=2, name="bar"), False),
(User(id=1, name=None), True),
(User(id=2, name=None), None),
],
)
eval_eq(
not_(User.id == 1),
testcases=[
(User(id=1), False),
(User(id=2), True),
(User(id=None), None),
],
)
def test_null_propagation(self):
User = self.classes.User
eval_eq(
(User.name == "foo") == (User.id == 1),
testcases=[
(User(id=1, name="foo"), True),
(User(id=2, name="foo"), False),
(User(id=1, name="bar"), False),
(User(id=2, name="bar"), True),
(User(id=None, name="foo"), None),
(User(id=None, name=None), None),
],
)
class M2OEvaluateTest(fixtures.DeclarativeMappedTest):
@classmethod
def setup_classes(cls):
Base = cls.DeclarativeBasic
class Parent(Base):
__tablename__ = "parent"
id = Column(Integer, primary_key=True)
class Child(Base):
__tablename__ = "child"
_id_parent = Column(
"id_parent", Integer, ForeignKey(Parent.id), primary_key=True
)
name = Column(String(50), primary_key=True)
parent = relationship(Parent)
def test_delete(self):
Parent, Child = self.classes("Parent", "Child")
session = Session()
p = Parent(id=1)
session.add(p)
session.commit()
c = Child(name="foo", parent=p)
session.add(c)
session.commit()
session.query(Child).filter(Child.parent == p).delete("evaluate")
is_(inspect(c).deleted, True)
|
