Return empty list when volume not attached

* The api used to return a list of a single empty dict
* Fixes bug 942990

Change-Id: I9926515acfcedf711e81615aa13cec0bbf968086

nova/api/openstack/volume/volumes.py

@@ -84,10 +84,10 @@ def _translate_volume_summary_view(context, vol):
     d['availabilityZone'] = vol['availability_zone']
     d['createdAt'] = vol['created_at']
 
+    d['attachments'] = []
     if vol['attach_status'] == 'attached':
-        d['attachments'] = [_translate_attachment_detail_view(context, vol)]
-    else:
-        d['attachments'] = [{}]
+        attachment = _translate_attachment_detail_view(context, vol)
+        d['attachments'].append(attachment)
 
     d['displayName'] = vol['display_name']
     d['displayDescription'] = vol['display_description']

nova/tests/api/openstack/fakes.py

@@ -591,25 +591,29 @@ def stub_instance(id, user_id=None, project_id=None, host=None,
     return instance
 
 
-def stub_volume(id):
-    return {'id': id,
-            'user_id': 'fakeuser',
-            'project_id': 'fakeproject',
-            'host': 'fakehost',
-            'size': 1,
-            'availability_zone': 'fakeaz',
-            'instance': {'uuid': 'fakeuuid'},
-            'mountpoint': '/',
-            'status': 'fakestatus',
-            'attach_status': 'attached',
-            'name': 'vol name',
-            'display_name': 'displayname',
-            'display_description': 'displaydesc',
-            'created_at': datetime.datetime(1, 1, 1, 1, 1, 1),
-            'snapshot_id': None,
-            'volume_type_id': 'fakevoltype',
-            'volume_metadata': [],
-            'volume_type': {'name': 'vol_type_name'}}
+def stub_volume(id, **kwargs):
+    volume = {
+        'id': id,
+        'user_id': 'fakeuser',
+        'project_id': 'fakeproject',
+        'host': 'fakehost',
+        'size': 1,
+        'availability_zone': 'fakeaz',
+        'instance': {'uuid': 'fakeuuid'},
+        'mountpoint': '/',
+        'status': 'fakestatus',
+        'attach_status': 'attached',
+        'name': 'vol name',
+        'display_name': 'displayname',
+        'display_description': 'displaydesc',
+        'created_at': datetime.datetime(1, 1, 1, 1, 1, 1),
+        'snapshot_id': None,
+        'volume_type_id': 'fakevoltype',
+        'volume_metadata': [],
+        'volume_type': {'name': 'vol_type_name'}}
+
+    volume.update(kwargs)
+    return volume
 
 
 def stub_volume_create(self, context, size, name, description, snapshot,

nova/tests/api/openstack/volume/test_volumes.py

@@ -135,6 +135,28 @@ def test_volume_show(self):
                                'size': 1}}
         self.assertEqual(res_dict, expected)
 
+    def test_volume_show_no_attachments(self):
+        def stub_volume_get(self, context, volume_id):
+            return fakes.stub_volume(volume_id, attach_status='detached')
+
+        self.stubs.Set(volume_api.API, 'get', stub_volume_get)
+
+        req = fakes.HTTPRequest.blank('/v1/volumes/1')
+        res_dict = self.controller.show(req, 1)
+        expected = {'volume': {'status': 'fakestatus',
+                               'displayDescription': 'displaydesc',
+                               'availabilityZone': 'fakeaz',
+                               'displayName': 'displayname',
+                               'attachments': [],
+                               'volumeType': 'vol_type_name',
+                               'snapshotId': None,
+                               'metadata': {},
+                               'id': '1',
+                               'createdAt': datetime.datetime(1, 1, 1,
+                                                              1, 1, 1),
+                               'size': 1}}
+        self.assertEqual(res_dict, expected)
+
     def test_volume_show_no_volume(self):
         self.stubs.Set(volume_api.API, "get", fakes.stub_volume_get_notfound)