Angularjs multiple ckEditors have same ngModel - angularjs

Question

I have ckeditor with wiris plug in ,and I have ck-editors instances in ng-repeate ,when user posts any wiris question at any instance of ck-editor ,that post is posted to fist instance of ck-editor.I want if 3 instances of ck-editors in ng-repeat,users post 2nd instance of ck-editor with wiris equation then that post should show at only 2nd instance of ck-editor only ,Presently it shows at only 1st instance .
My html :
<div ng-repeat="item in items">
<form role="form" name="DiscussionForm" novalidate>
<input type="text" name="followup" ng-model="followupDis"
ck-editor placeholder="Compose" required>
<div><button type="submit"ng-click="start()">Post</button>
</div>
</form>
</div>
in js
app.directive('ckEditor', function() {
return {
require: '?ngModel',
link: function(scope, elm, attr, ngModel) {
var ck = CKEDITOR.replace(elm[0]);
if (!ngModel) return;
ck.on('instanceReady', function() {
ck.setData(ngModel.$viewValue);
});
function updateModel() {
scope.$apply(function() {
ngModel.$setViewValue(ck.getData());
});
}
ck.on('change', updateModel);
ck.on('focus', updateModel);
ck.on('key', updateModel);
ck.on('dataReady', updateModel);
ngModel.$render = function(value) {
ck.setData(ngModel.$viewValue);
};
}
};
});
I am expecting in directive I have create the instance for the first element var ck = CKEDITOR.replace(elm[0]); so it should change.
So any one can share the solution for multiple instances of ckeditor with wiris .

Answer 1

I have found by changing the id of the attribute we can solve this one .
in js:
app.directive('ckEditor', function() {
var counter = 0, prefix = "followupDiscussionPostReply-";
return {
require: '?ngModel',
link: function(scope, elm, attr, ngModel) {
if (!attr.id) {
attr.$set('id', prefix + (++counter));
}
// rest of the code
these changes fixed the multiple ckeditors have same ngModel issue for me .