OpenConceptLab/ocl_issues#2174 | fixing facets api

Author: snyaggarwal

core/common/views.py

@@ -433,11 +433,14 @@ def get_facets(self):
             parent = get(
                 self, 'parent_resource'
             ) if 'source' in self.kwargs and self.is_concept_document() else None
-            faceted_search = self.facet_class(  # pylint: disable=not-callable
-                source=parent,
-                query=self.get_search_string(lower=False),
-                _search=self.__get_search_results(ignore_retired_filter=True, sort=False, highlight=False, force=True),
-            )
+            facet_kwargs = {
+                'query': self.get_search_string(lower=False),
+                '_search': self.__get_search_results(
+                    ignore_retired_filter=True, sort=False, highlight=False, force=True)
+            }
+            if parent:
+                facet_kwargs['source'] = parent
+            faceted_search = self.facet_class(**facet_kwargs)  # pylint: disable=not-callable
             faceted_search.params(request_timeout=ES_REQUEST_TIMEOUT)
             try:
                 s = faceted_search.execute()