I'm running into a tough bug when trying to save a record with the LocalStorage Adapter that has a hasMany relationship (Using Ember CLI). What I'm trying to do is save a product to a bag when a user clicks on a "Add to Bag" button. I'm getting this error in my console:

`Uncaught TypeError: Cannot read property 'determineRelationshipType' of undefined`

Product Model:

```
import DS from 'ember-data';

export default DS.Model.extend({
  ...
  bag: DS.belongsTo('bag')

});

```

Bag Model:

```
import DS from 'ember-data';

export default DS.Model.extend({
  products: DS.hasMany('product', {async: true})
});

```

Here's the action in the controller:

```
import Ember from "ember";

export default Ember.ArrayController.extend({
  actions: {
    addToBag: function(model) {
      var bag = this.store.createRecord('bag');
      bag.get('products').then(function(products) {
        products.pushObject(model);
        bag.save();
      });
    }
  }
});

```

Would anyone have an idea as to what's going wrong? Or another way to approach this? Seems like a similar issue [was reported here](https://github.com/firebase/emberfire/issues/123). Would greatly appreciate any help! Thank you in advance.