Make Resource class's function can be wraped by api_version

api_verson.wraps() function requires the object to have an
api_version attribute[1]. This change add api_version
attribute to Resource class, so that we can use api_version
to wrap functions in Resource class.

[1]: https://github.com/openstack/python-cinderclient/blob/master/cinderclient/api_versions.py#L346
Partial-Bug: #1619105

Change-Id: I0fce855768a4a5165ce08274214d4907b4d2fb66

cinderclient/openstack/common/apiclient/base.py

@@ -506,6 +506,10 @@ class Resource(RequestIdMixin):
         else:
             return self.__dict__[k]
 
+    @property
+    def api_version(self):
+        return self.manager.api_version
+
     def get(self):
         # set_loaded() first ... so if we have to bail, we know we tried.
         self.set_loaded(True)

cinderclient/tests/unit/test_base.py

@@ -13,11 +13,14 @@
 
 from requests import Response
 
+from cinderclient import api_versions
 from cinderclient import base
+from cinderclient.v3 import client
 from cinderclient import exceptions
 from cinderclient.openstack.common.apiclient import base as common_base
 from cinderclient.v1 import volumes
 from cinderclient.tests.unit import utils
+from cinderclient.tests.unit import test_utils
 from cinderclient.tests.unit.v1 import fakes
 
 
@@ -87,6 +90,13 @@ class BaseTest(utils.TestCase):
         r = base.Resource(None, {"name": "1"}, resp=resp_obj)
         self.assertEqual([REQUEST_ID], r.request_ids)
 
+    def test_api_version(self):
+        version = api_versions.APIVersion('3.1')
+        api = client.Client(api_version=version)
+        manager = test_utils.FakeManagerWithApi(api)
+        r1 = base.Resource(manager, {'id': 1})
+        self.assertEqual(version, r1.api_version)
+
 
 class ListWithMetaTest(utils.TestCase):
     def test_list_with_meta(self):