Django #15363

qs.py

def deprecated_get_query_set(cls):
    def get_query_set(self, *args, **kwargs):
        self.trace.append("%s.get_query_set" % cls.__name__)
        return cls.get_queryset(self, *args, **kwargs)
    cls.get_query_set = get_query_set
    # Account for already defined __getattribute__
    getattribute = getattr(cls, '__getattribute__')
    def __getattribute__(self, name):
        attribute = getattribute(self, name)
        if name == 'get_queryset':
            print(self, cls)
            if attribute.im_func is cls.get_queryset.im_func:
                # No defined `get_queryset` method
                get_query_set = getattribute(self, 'get_query_set')
                if get_query_set.im_func is not cls.get_query_set.im_func:
                    # Fallback to defined `get_query_set`
                    return get_query_set
        return attribute
    cls.__getattribute__ = __getattribute__
    return cls


@deprecated_get_query_set
class Manager(object):
    def __init__(self):
        self.trace = []

    def get_queryset(self):
        self.trace.append('Manager.get_queryset')
        return self.trace


class Old(Manager):
    def get_query_set(self):
        self.trace.append('Old.get_query_set')
        return super(Old, self).get_query_set()

#assert Old().get_queryset() == ['Old.get_query_set', 'Manager.get_query_set', 'Manager.get_queryset']
#assert Old().get_query_set() == ['Old.get_query_set', 'Manager.get_query_set', 'Manager.get_queryset']


class OldSubclass(Manager):
    def get_query_set(self):
        self.trace.append('OldSubclass.get_query_set')
        return super(OldSubclass, self).get_query_set()

#assert OldSubclass().get_queryset() == ['OldSubclass.get_query_set', 'Old.get_query_set', 'Manager.get_query_set', 'Manager.get_queryset']
#assert OldSubclass().get_query_set() == ['OldSubclass.get_query_set', 'Old.get_query_set', 'Manager.get_query_set', 'Manager.get_queryset']

@deprecated_get_query_set
class New(Manager):
    def get_queryset(self):
        self.trace.append('New.get_queryset')
        return super(New, self).get_queryset()

#assert New().get_queryset() == ['New.get_queryset', 'Manager.get_queryset']
#assert New().get_query_set() == ['New.get_query_set', 'New.get_queryset', 'Manager.get_queryset']

@deprecated_get_query_set
class NewSubclass(Manager):
    def get_queryset(self):
        self.trace.append('NewSubclass.get_queryset')
        return super(NewSubclass, self).get_queryset()

assert NewSubclass().get_queryset() == ['NewSubclass.get_queryset', 'New.get_queryset', 'Manager.get_queryset']
assert NewSubclass().get_query_set() == ['NewSubclass.get_query_set', 'NewSubclass.get_queryset', 'New.get_queryset', 'Manager.get_queryset']