As per our conversation in https://github.com/nilbus/Backbone.dualStorage/pull/83#discussion_r8734694, let's try not using `findWhere`, since it will definitely not work for models with a different `idAttribute`. Both `id` and `attributes[idAttribute]` get set when a model is stored locally (https://github.com/tute/Backbone.dualStorage/blob/master/backbone.dualstorage.coffee#L93). Thus this can all become:

```coffeescript
for id in ids
  @get(id)?.save()
```