Fix volume group create from source to use dict access

When creating a volume group from a source group or group snapshot,
the create_group_from_source API returns a dictionary rather than
an SDK resource object. This change updates the code to access the
group ID using dictionary notation (group['id']) instead of
attribute access (group.id).

Updated unit tests to mock create_group_from_source with a
dictionary return value to match the actual API behavior.

Assisted-By: Claude Sonnet 4.5
Change-Id: Icefc4f2237f39f1ab52837f8ad8cebf0869c3b99
Signed-off-by: rajathere <rajatdhasmana@gmail.com>

Author: rajathere

openstackclient/tests/unit/volume/v3/test_volume_group.py

@@ -74,9 +74,9 @@ def setUp(self):
         )
         self.volume_client.create_group.return_value = self.fake_volume_group
         self.volume_client.get_group.return_value = self.fake_volume_group
-        self.volume_client.create_group_from_source.return_value = (
-            self.fake_volume_group
-        )
+        self.volume_client.create_group_from_source.return_value = {
+            'id': self.fake_volume_group.id
+        }
         self.volume_client.find_group_snapshot.return_value = (
             self.fake_volume_group_snapshot
         )

openstackclient/volume/v3/volume_group.py

@@ -269,7 +269,7 @@ def take_action(
                 name=parsed_args.name,
                 description=parsed_args.description,
             )
-            group = volume_client.get_group(group.id)
+            group = volume_client.get_group(group['id'])
             return _format_group(group)