Assign dynamic ng-model in a template for radio buttons - angularjs

Question

I use a directive to add images and radio buttons (per image). I also create dynamically ng-models. Now with my approach, the radio buttons will not be set. What's wrong? Thank your for your hints.
JS
.directive('oct', function() {
return {
restrict : 'E',
template : `
<div class="oImg" ng-repeat="image in images">
<a href="#" class="removeImage" ng-click="vm.removeImg(image)"
ng-show="isActive($index)"><i class="fa fa-trash"></i>
</a>
<img ng-src="{$image.src$}" class="images-item"
ng-show="isActive($index)"><span ng-show="isActive($index)" class="imgName">{$image.name$}</span>
<div class="sideSelect" ng-show="isActive($index)">
<div class="checkbox"><label>
<input type="radio" ng-model="eyeChanger[image.name]"
name="optionsEye"
ng-change="vm.changeEye(image, eyeChanger[image.name])"
value="RA">RA</label>
</div>
<div class="checkbox"><label>
<input type="radio" ng-model="eyeChanger[image.name]"
ng-change="vm.changeEye(image, eyeChanger[image.name])"
name="optionsEye" value="LA">LA</label>
</div>
</div>
</div>
`,
controller : ['$scope', '$http',
function($scope, $http) {
$scope._Index = 0;
// if current image is same as requested image
$scope.isActive = function(index) {
return $scope._Index === index;
};
// prev image
$scope.showPrev = function() {
if ($scope._Index != 0) {
$scope._Index = ($scope._Index > 0) ? --$scope._Index : $scope.images.length - 1;
}
};
// next image
$scope.showNext = function() {
if ($scope._Index < $scope.images.length - 1) {
$scope._Index = ($scope._Index < $scope.images.length - 1) ? ++$scope._Index : 0;
};
};
}]
};
})
vm.changeEye = function(img, value) {
$scope['eyeChanger'+img.name] = value;
...

Answer 1

Use:
vm.changeEye = function(img, value) {
̶$̶s̶c̶o̶p̶e̶[̶'̶e̶y̶e̶C̶h̶a̶n̶g̶e̶r̶'̶+̶i̶m̶g̶.̶n̶a̶m̶e̶]̶ ̶=̶ ̶v̶a̶l̶u̶e̶;̶
$scope.eyeChanger[img.name] = value;
...
There is no need to do this with ng-change as the ng-model directive does it automatically.
<div ng-repeat="image in images">
<img ng-src="{{image.src}}" />
<div class="checkbox"><label>
<input type="radio" ng-model="eyeChanger[image.name]"
name="optionsEye"
̶n̶g̶-̶c̶h̶a̶n̶g̶e̶=̶"̶v̶m̶.̶c̶h̶a̶n̶g̶e̶E̶y̶e̶(̶i̶m̶a̶g̶e̶,̶ ̶e̶y̶e̶C̶h̶a̶n̶g̶e̶r̶[̶i̶m̶a̶g̶e̶.̶n̶a̶m̶e̶]̶)̶"̶
value="RA">RA</label>
</div>
<div class="checkbox"><label>
<input type="radio" ng-model="eyeChanger[image.name]"
̶n̶g̶-̶c̶h̶a̶n̶g̶e̶=̶"̶v̶m̶.̶c̶h̶a̶n̶g̶e̶E̶y̶e̶(̶i̶m̶a̶g̶e̶,̶ ̶e̶y̶e̶C̶h̶a̶n̶g̶e̶r̶[̶i̶m̶a̶g̶e̶.̶n̶a̶m̶e̶]̶)̶"̶
name="optionsEye" value="LA">LA</label>
</div>
</div>
The radio buttons can be initialized:
$scope.images = [
{ name: "name1", src: "..." },
{ name: "name2", src: "..." },
// ...
];
$scope.eyeChanger = {
name1: "RA",
name2: "LA",
// ...
};