The "volume" selection form element allows one to display volumes, or volumes and volume snapshots (if the include_snapshots attribute is specified). There is no way to display only volume snapshots, nor is there any way to distinguish a volume from a volume snapshot in the list.
In most cases, the selection of a volume or a volume snapshot is a very distinct case; selecting a volume snapshot in place of a volume (or vice-versa) will generally result in an error. Therefore, we need to provide a way to display either only volumes, only volume snapshots or both.
Possible fix: Add an attribute: include_volumes, to show volumes if set to True (default, for backward compatibility). If set to False, the list will not include volumes.
Seen with OpenStack Pike.
Fix proposed to branch: master
Review: https:/