angularjs - Why is scope variable in directive undefined? -

i have following parent , child (http://jsfiddle.net/j1ee5zss/2/):

<div parent parent-model="my-model">   <div child>child</div> </div> 

in child directive trying parent-model, e.g., "my-model":

app.directive("parent", parent);  function parent() {    var parent = {     controller: ["$scope", controller],     replace: false,           restrict: "a",     scope: {       model: "="     }       };    return parent;    function controller($scope) {      this.getmodel = function () {       return $scope.model;     }       }    }    app.directive("child", child);  function child() {   var child = {     link: link,     replace: false,     require: "^parent",     restrict: "a"   };   return child;   function link(scope, element, attributes, controller) {         var model = controller.getmodel();     console.log(model);       }   } 

why model undefined when write console.log(model)?

maybe should observe parentmodel, not model?

      scope: {            parentmodel: "="        }  

or use attribute model.