Convert a boolean value to a string using filter in AngularJS

I am working on an AngularJS app and need to create a filter. In my database, I have a string value that indicates whether the data is active or inactive. I use 'S' for active and 'N' for inactive. I added a checkbox button on my page to filter the data retrieved from the database, to show inactive items or not. However, I need to convert the value of the checkbox button to 'S' or 'N'. How can I achieve this? Currently, I'm trying to implement the following code:

app.filter('cakeActive', function(){
    return function(input){
        if(input == true){
            return 'S';
        }
        else {
            return 'N';
        }
    };
});

And in my DOM, I have:

<input checked type="checkbox" ng-model="active">
<div class="col s12 m12 l12" ng-repeat="cake in cakes | {cake.active == cakeActive:active}">...</div>

However, this implementation is not working as expected. What would be the best approach to fix this issue? Thanks!

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