make_model: add TODO on xhr cancelling and re-requesting

src/util/make_model.js

@@ -96,6 +96,11 @@ export default (options={}) => {
 			if (_promise != null)
 				return _promise
 
+			// TODO
+			// ambient = select + order + limit/offset
+			// if ambient is changed, cancel currently loading xhr; otherwise return
+			// current promise
+
 			// now the hard work
 			_promise = _configs.api.request({
 				method: 'GET',