Regression in pickling LazyObject on Python 2 if wrapped object doesn't have __reduce__()

[Sergey Fedoseev]

In [126]: import pickle
In [127]: from django.utils.functional import LazyObject
In [128]: class A(object):
     ...:     pass
     ...:
In [129]: lazy_obj = LazyObject()
In [130]: a = A()
In [131]: a.foo = 'bar'
In [132]: lazy_obj._wrapped = a
In [133]: pickle.loads(pickle.dumps(lazy_obj)).foo
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-133-a85d49df8170> in <module>()
----> 1 pickle.loads(pickle.dumps(lazy_obj)).foo

AttributeError: 'A' object has no attribute 'foo'

Introduced in 35355a4ffedb2aeed52d5fe3034380ffc6a438db.

[Sergey Fedoseev]

​PR

[Tim Graham <timograham@…>]

In 30f334c:

[1.11.x] Fixed #28389 -- Fixed pickling of LazyObject on Python 2 when wrapped object doesn't have reduce().

Partial revert of 35355a4ffedb2aeed52d5fe3034380ffc6a438db.

[Tim Graham <timograham@…>]

In 83440a1:

Refs #28389 -- Added release note and test for pickling of LazyObject when wrapped object doesn't have reduce().

Forwardport of 30f334cc58e939c7d9bd8455c80bd066fbde9f2b from stable/1.11.x