Cannot pickle queryset with Subquery and OuterRef

[mozinda]

I am not able to cache or even pickle a queryset that has a Subquery or OuterRef. Getting the error:

ValueError: This queryset contains a reference to an outer query and may only be used in a subquery.

Here is my queryset:

qs = self.queryset.filter(
                    Q(user__in=Follow.objects.filter(
                                                follower=userid,
                                                ).values('followee')) \
                    | Q(user=userid))\
                    .prefetch_related('postlike_set')\
                    .annotate(Count('postlike'))\
                    .annotate(Count('postcomment'))\
                    .annotate(
                        liked=Subquery(
                        PostLike.objects.filter(user=self.request.user,
                                                post_id=OuterRef('id'),
                                                ).values('user')
                                       )
                           )
cache.set(f'feed:{userid}', qs)

And here is the output:

File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django_redis/client/default.py", line 326, in encode
    value = self._serializer.dumps(value)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django_redis/serializers/pickle.py", line 32, in dumps
    return pickle.dumps(value, self._pickle_version)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/query.py", line 224, in __getstate__
    self._fetch_all()
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/query.py", line 1179, in _fetch_all
    self._result_cache = list(self._iterable_class(self))
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/query.py", line 107, in __iter__
    for row in compiler.results_iter(chunked_fetch=self.chunked_fetch, chunk_size=self.chunk_size):
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1014, in results_iter
    results = self.execute_sql(MULTI, chunked_fetch=chunked_fetch, chunk_size=chunk_size)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 1050, in execute_sql
    sql, params = self.as_sql()
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 458, in as_sql
    where, w_params = self.compile(self.where) if self.where is not None else ("", [])
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 390, in compile
    sql, params = node.as_sql(self, self.connection)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/sql/where.py", line 80, in as_sql
    sql, params = compiler.compile(child)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 390, in compile
    sql, params = node.as_sql(self, self.connection)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/fields/related_lookups.py", line 130, in as_sql
    return super().as_sql(compiler, connection)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/lookups.py", line 161, in as_sql
    rhs_sql, rhs_params = self.process_rhs(compiler, connection)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/lookups.py", line 260, in process_rhs
    return super().process_rhs(compiler, connection)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/lookups.py", line 90, in process_rhs
    sql, params = compiler.compile(value)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/sql/compiler.py", line 390, in compile
    sql, params = node.as_sql(self, self.connection)
  File "/Users/my-app/app/venv-app/lib/python3.6/site-packages/django/db/models/expressions.py", line 536, in as_sql
    'This queryset contains a reference to an outer query and may '
ValueError: This queryset contains a reference to an outer query and may only be used in a subquery.