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from sqlalchemy.test.testing import assert_raises, assert_raises_message
from sqlalchemy.orm import interfaces, util
from sqlalchemy import Column
from sqlalchemy import Integer
from sqlalchemy import MetaData
from sqlalchemy import Table
from sqlalchemy.orm import aliased
from sqlalchemy.orm import mapper, create_session
from sqlalchemy.test import TestBase, testing
from test.orm import _fixtures
from sqlalchemy.test.testing import eq_
class ExtensionCarrierTest(TestBase):
def test_basic(self):
carrier = util.ExtensionCarrier()
assert 'translate_row' not in carrier
assert carrier.translate_row() is interfaces.EXT_CONTINUE
assert 'translate_row' not in carrier
assert_raises(AttributeError, lambda: carrier.snickysnack)
class Partial(object):
def __init__(self, marker):
self.marker = marker
def translate_row(self, row):
return self.marker
carrier.append(Partial('end'))
assert 'translate_row' in carrier
assert carrier.translate_row(None) == 'end'
carrier.push(Partial('front'))
assert carrier.translate_row(None) == 'front'
assert 'populate_instance' not in carrier
carrier.append(interfaces.MapperExtension)
# Py3K
#assert 'populate_instance' not in carrier
# Py2K
assert 'populate_instance' in carrier
# end Py2K
assert carrier.interface
for m in carrier.interface:
assert getattr(interfaces.MapperExtension, m)
class AliasedClassTest(TestBase):
def point_map(self, cls):
table = Table('point', MetaData(),
Column('id', Integer(), primary_key=True),
Column('x', Integer),
Column('y', Integer))
mapper(cls, table)
return table
def test_simple(self):
class Point(object):
pass
table = self.point_map(Point)
alias = aliased(Point)
assert alias.id
assert alias.x
assert alias.y
assert Point.id.__clause_element__().table is table
assert alias.id.__clause_element__().table is not table
def test_notcallable(self):
class Point(object):
pass
table = self.point_map(Point)
alias = aliased(Point)
assert_raises(TypeError, alias)
def test_instancemethods(self):
class Point(object):
def zero(self):
self.x, self.y = 0, 0
table = self.point_map(Point)
alias = aliased(Point)
assert Point.zero
# Py2K
# TODO: what is this testing ??
assert not getattr(alias, 'zero')
# end Py2K
def test_classmethods(self):
class Point(object):
@classmethod
def max_x(cls):
return 100
table = self.point_map(Point)
alias = aliased(Point)
assert Point.max_x
assert alias.max_x
assert Point.max_x() == alias.max_x()
def test_simpleproperties(self):
class Point(object):
@property
def max_x(self):
return 100
table = self.point_map(Point)
alias = aliased(Point)
assert Point.max_x
assert Point.max_x != 100
assert alias.max_x
assert Point.max_x is alias.max_x
def test_descriptors(self):
class descriptor(object):
"""Tortured..."""
def __init__(self, fn):
self.fn = fn
def __get__(self, obj, owner):
if obj is not None:
return self.fn(obj, obj)
else:
return self
def method(self):
return 'method'
class Point(object):
center = (0, 0)
@descriptor
def thing(self, arg):
return arg.center
table = self.point_map(Point)
alias = aliased(Point)
assert Point.thing != (0, 0)
assert Point().thing == (0, 0)
assert Point.thing.method() == 'method'
assert alias.thing != (0, 0)
assert alias.thing.method() == 'method'
def test_hybrid_descriptors(self):
from sqlalchemy import Column # override testlib's override
import types
class MethodDescriptor(object):
def __init__(self, func):
self.func = func
def __get__(self, instance, owner):
if instance is None:
# Py3K
#args = (self.func, owner)
# Py2K
args = (self.func, owner, owner.__class__)
# end Py2K
else:
# Py3K
#args = (self.func, instance)
# Py2K
args = (self.func, instance, owner)
# end Py2K
return types.MethodType(*args)
class PropertyDescriptor(object):
def __init__(self, fget, fset, fdel):
self.fget = fget
self.fset = fset
self.fdel = fdel
def __get__(self, instance, owner):
if instance is None:
return self.fget(owner)
else:
return self.fget(instance)
def __set__(self, instance, value):
self.fset(instance, value)
def __delete__(self, instance):
self.fdel(instance)
hybrid = MethodDescriptor
def hybrid_property(fget, fset=None, fdel=None):
return PropertyDescriptor(fget, fset, fdel)
def assert_table(expr, table):
for child in expr.get_children():
if isinstance(child, Column):
assert child.table is table
class Point(object):
def __init__(self, x, y):
self.x, self.y = x, y
@hybrid
def left_of(self, other):
return self.x < other.x
double_x = hybrid_property(lambda self: self.x * 2)
table = self.point_map(Point)
alias = aliased(Point)
alias_table = alias.x.__clause_element__().table
assert table is not alias_table
p1 = Point(-10, -10)
p2 = Point(20, 20)
assert p1.left_of(p2)
assert p1.double_x == -20
assert_table(Point.double_x, table)
assert_table(alias.double_x, alias_table)
assert_table(Point.left_of(p2), table)
assert_table(alias.left_of(p2), alias_table)
class IdentityKeyTest(_fixtures.FixtureTest):
run_inserts = None
@testing.resolve_artifact_names
def test_identity_key_1(self):
mapper(User, users)
key = util.identity_key(User, 1)
eq_(key, (User, (1,)))
key = util.identity_key(User, ident=1)
eq_(key, (User, (1,)))
@testing.resolve_artifact_names
def test_identity_key_2(self):
mapper(User, users)
s = create_session()
u = User(name='u1')
s.add(u)
s.flush()
key = util.identity_key(instance=u)
eq_(key, (User, (u.id,)))
@testing.resolve_artifact_names
def test_identity_key_3(self):
mapper(User, users)
row = {users.c.id: 1, users.c.name: "Frank"}
key = util.identity_key(User, row=row)
eq_(key, (User, (1,)))
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