Dynamically rollback Ember model relationships

relationship-rollback.coffee

    App.MyModel.eachRelationship (name, relationship) ->
      relationshipInstance = modelInstance.get name
      if relationshipInstance
        if relationship.kind is 'belongsTo'
          relationshipInstance.rollback()
        else if relationshipInstance.content and relationship.kind is 'hasMany'
          relationshipInstance.content.forEach (record) ->
            record.rollback()

This is not code that lends itself to testing. The eachRelationship function will trigger model fetching from the dependency injection container. There is no easy way to control this. One solution is to use the ES6 module loader to import the model class and import a different class when testing.