AngularJS directive to alter ng-option attribute

I have a Laravel 5.1 AngularJS app I am developing. I have a select that I populate with ng-options.

It returns a collection from Laravel that makes up the select options. What I want to do is reuse this ng-options collection in subsequent selects AND remove the previously selected option from the next select.

So for example;

What are your 3 favourite features?

Feature select 1

A

B (assume user selects)

C

Feature select 2

A

C

etc.

In my HTML I have;

<select class="form-control" ng-model="newReport.features1" ng-change="setSelected()" ng-options="feature.feature_name as feature.feature_name for feature in features | filter:{selected:false}" required>

I am hoping I can use ng-change and a setSelected() directive to change the 'selected' value of the selected option to 'true'. With the use of the filter, it would then be removed from the next select.

My challenge - how do I write that directive. I need to change the ng-option not the ng-model.

Any ideas? Thanks!

via Chebli Mohamed