Get a dynamic ng-model from DOM and use it in a function

Question

Sup guys! I am trying to build a dynamic form, but I got stuck in a ngModel problem.

The idea is:

I got 2 arrays: one for temporary show to user selected info, and another that is which actually is saved on post (I have different types of data, so I have to do this way).

1- The user uses a <select> to choose a option. The selected option is a object inside a list. User hits the add link, and the selected option pop for him.

2- The selected option, has a custom property, that must be set before hit the add button. For that, a ´input´ pop when an option is selected. the ngModel for this is dynamically set, based on a object's property.

3- I need to get the input data, and save it inside a property of the object selected on the list.

4- Push the object to the array-to-be-posted (newData).

What I have that work: the list, the dynamic ngModel. What I need: to get the data from this ngModel ad use it inside my directive.

here go the codes:

html:

        <select id="newPrereq" class="form-control" name="newPrereq" ng-model="newPrereq" ng-options="prereq.name group by prereq.cat for prereq in prereqs | orderBy:prereq.name">
            <option value="" hidden>-- Select --</option>
        </select>
        <input type="{{newPrereq.type}}" ng-show="newPrereq.array" ng-model="newPrereq[ngModel]">

        <a ng-click="addItem(newPrereq, selectedPrereqs, 'prereqs')" ng-show="newPrereq !== undefined || ''">add</a>

        <ul class="list-inline">
            <li ng-repeat="prereq in selectedPrereqs"><span>{{prereq.name}} </span> <a ng-click="removeItem($index, selectedPrereqs, 'prereqs')">[X]</a></li>
        </ul>

directive (scope:false) relevant functions:

            scope.prereqs = Lists.prereqs;

            scope.addItem = function(obj, array, group){
                array.push(obj);                                    // Add item to array-to-be-posted

                if(obj.array){
                    scope.newData.prereqs.proficiencies.push({'name': obj.name, 'cat': obj.cat,  'details': [something here to get the ng-model from DOM]})
                };

                scope[group] = scope[group].filter(function(list){  // Remove added item from the <select>
                    return list !== obj;
                });
                scope.newPrereq = undefined;
            };

part of the list (come from a Lists.js service)

        'prereqs': [
            {'name':'option 1',         'cat':'category 1', 'type':'text',      'ngModel':'smDetails',  'array':true},
            {'name':'option 2',     'cat':'category 2', 'type':'text',      'ngModel':'srDetails',  'array':true},
        ]