ensure annotation directory for new annotations

cellxgene_gateway/dir_util.py

@@ -62,3 +62,8 @@ def make_h5ad(el):
 
 def make_annotations(el):
     return el[:-5] + annotations_suffix
+
+
+def ensure_dir_exists(file_path):
+    if not os.path.exists(file_path):
+        os.makedirs(file_path)

cellxgene_gateway/items/file/fileitem_source.py

@@ -130,6 +130,7 @@ class FileItemSource(ItemSource):
             )
             item = self.lookup_item(h5ad_descriptor)
             if item is not None:
+                dir_util.ensure_dir_exists(self.full_path(annotation_item.subpath))
                 return LookupResult(item, annotation_item)
         else:
             item = self.lookup_item(descriptor)