Checkbox ng-false-value as null

Question

I have corner flags with the following markup:

<div class="ml20" ng-repeat="rate in auraInfo.rates">
    <label class="aura-checkbox">
         <input type="checkbox" 
                ng-model="model.checkedRates[$index]" 
                ng-true-value="{{ rate.id }}" 
                ng-false-value="????" />
    </label>
</div>

checkedRates is an array that is populated with identifiers when the user checks the checkboxes. There is also a button that sends these identifiers to the server. If the user checks and deselects the same checkbox , the value "false" will be sent to the server.

How to set null (or completely remove an element from an array) if the checkbox is not selected?

Thanks in advance:)

Answer 1

ng-false-value="{{ null }}"? , , , submit.