javascript - AngularJS not linking with MVC Model -

we building form within ng-repeat tag. ng-model not seem linking mvc control model.

<li ng-repeat="item in favourites">    <form ng-submit="delete()" id="frmspec">        <input  ng-model="item.description"/>        <input  ng-model="item.refno"/>        <button type="submit"class="btn">{{item.description}} <span class="glyphicon glyphicon-remove"></span></button>    </form> </li>    <script type="text/javascript">   $scope.delete = function () {               var url = '/list/deletefavourites/';               $http.post(url, $scope.formdata)                     .success(function (data) {                     });           };</script> 

within mvc controller

        public actionresult deletefavourites(models.mymodel mm, string buttontype)         {          } 

this issue mm being returned null

any appreciated.