I have a variable selectedSubTopicId and I have an array of subTopic objects: objectiveDetail.subTopics[]. Each subTopic object has a field subTopicId

I would like to use this to enable or disable and Add topic button. Can I use lodash in the ng-disabled to test this array and report true if any subTopic object element of the array has a subTopicId that is equal to the selectedSubTopicId.

Here's a sample of the data that's in objectiveDetail. In this case there's just one element in the subTopics array.

{objectiveDetailId:285,

 objectiveId:29,

 number:1,

 text:x,

 subTopics:[{subTopicId:1,

               number:1}]

}

Here is the code in my Angular Controller suggested by thefourtheye:

    $scope.checkDuplicateSubTopicId = function (objectiveDetail, sSubTopic) {

        if (_.some(objectiveDetail.subTopics, function(currentTopic) {

            return _.contains(currentTopic, selectedSubTopicId);

        })) {

            return true;

        } else {

            return false;

        }

    }

My button with the click function not shown looks like this:

   <button data-ng-disabled=checkDuplicateSubTopicId(objectiveDetail, subTopicId)>

       Add Topic

   </button>

The problem is that it's not quite working and the button does not show disabled.