Support worker_version=False in both cache and no cache mode

Closes #124 (closed)

arkindex_worker/worker/element.py

@@ -261,7 +261,7 @@ class ElementMixin(object):
         with_corpus: Optional[bool] = None,
         with_has_children: Optional[bool] = None,
         with_zone: Optional[bool] = None,
-        worker_version: Optional[str] = None,
+        worker_version: Optional[Union[str, bool]] = None,
     ) -> Union[Iterable[dict], Iterable[CachedElement]]:
         """
         List children of an element.
@@ -295,7 +295,7 @@ class ElementMixin(object):
            This parameter is not supported when caching is enabled.
         :type with_zone: Optional[bool]
         :param worker_version: Restrict to elements created by a worker version with this UUID.
-        :type worker_version: Optional[str]
+        :type worker_version: Optional[Union[str, bool]]
         :return: An iterable of dicts from the ``ListElementChildren`` API endpoint,
            or an iterable of :class:`CachedElement` when caching is enabled.
         :rtype: Union[Iterable[dict], Iterable[CachedElement]]
@@ -330,10 +330,14 @@ class ElementMixin(object):
         if with_zone is not None:
             assert isinstance(with_zone, bool), "with_zone should be of type bool"
             query_params["with_zone"] = with_zone
-        if worker_version:
+        if worker_version is not None:
             assert isinstance(
-                worker_version, str
-            ), "worker_version should be of type str"
+                worker_version, (str, bool)
+            ), "worker_version should be of type str or bool"
+            if isinstance(worker_version, bool):
+                assert (
+                    worker_version is False
+                ), "if of type bool, worker_version can only be set to False"
             query_params["worker_version"] = worker_version
 
         if self.use_cache:
@@ -346,8 +350,12 @@ class ElementMixin(object):
             query = CachedElement.select().where(CachedElement.parent_id == element.id)
             if type:
                 query = query.where(CachedElement.type == type)
-            if worker_version:
-                query = query.where(CachedElement.worker_version_id == worker_version)
+            if worker_version is not None:
+                # If worker_version=False, filter by manual worker_version e.g. None
+                worker_version_id = worker_version if worker_version else None
+                query = query.where(
+                    CachedElement.worker_version_id == worker_version_id
+                )
 
             return query
         else: