Support create attribute api

Change-Id: If55c722166bbaa3f0203ce5c0c9002ceb3bde859

cyborg/api/controllers/v2/attributes.py

@@ -136,6 +136,25 @@ class AttributesController(base.CyborgController,
         LOG.info('[attributes] get_one returned: %s', ret)
         return ret
 
+    @authorize_wsgi.authorize_wsgi("cyborg:attribute", "create", False)
+    @expose.expose(Attribute, body=types.jsontype,
+                   status_code=HTTPStatus.CREATED)
+    def post(self, req_attr):
+        """Create one attribute.
+        :param req_attr: attribute value.
+         { "deployable_id": <integer>,
+           "key": <string>,
+           "value": <string>
+         }
+         :returns: The object of created attribute
+        """
+        LOG.info("[attributes] POST request = (%s)", req_attr)
+        context = pecan.request.context
+        attribute = objects.Attribute(context, **req_attr).create(context)
+        ret = Attribute.convert_with_links(attribute)
+        LOG.info('[attributes] post returned: %s', ret)
+        return ret
+
     @authorize_wsgi.authorize_wsgi("cyborg:attribute", "delete")
     @expose.expose(None, wtypes.text, status_code=HTTPStatus.NO_CONTENT)
     def delete(self, uuid):

cyborg/common/policy.py

@@ -69,6 +69,9 @@ attribute_policies = [
     policy.RuleDefault('cyborg:attribute:get_all',
                        'rule:allow',
                        description='Retrieve all attribute records'),
+    policy.RuleDefault('cyborg:attribute:create',
+                       'rule:allow',
+                       description='Create an attribute record'),
     policy.RuleDefault('cyborg:attribute:delete',
                        'rule:allow',
                        description='Delete attribute records.'),

cyborg/objects/attribute.py

@@ -48,7 +48,7 @@ class Attribute(base.CyborgObject, object_base.VersionedObjectDictCompat):
         values = self.obj_get_changes()
         db_attr = self.dbapi.attribute_create(context,
                                               values)
-        self._from_db_object(self, db_attr)
+        return self._from_db_object(self, db_attr)
 
     @classmethod
     def get(cls, context, uuid):