angularjs - Cannot $remove in nested controllers with angularfire -

i using angularfire manage online courses , have courses each have many lectures. nested lectures within courses. have factory allows crud operations on courses lectures, can except delete. tell me doing wrong delete? much!

courses factory:

angular.module('rutileapp')   .factory('course', function ($firebasearray, $firebaseobject, ref) {     var courses = $firebasearray(ref.child('courses'));      var course = {       all: courses,       create: function (course) {         return courses.$add(course);       },       get: function(courseid) {         return $firebaseobject(ref.child('courses').child(courseid));       },       delete: function(course) {         return courses.$remove(course);       }     };      return course;   }); 

lectures factory:

angular.module('rutileapp')   .factory('lecture', function ($firebasearray, $firebaseobject, ref) {      var lecture = {       create: function (courseid, lecture) {         return $firebasearray(ref.child('courses').child(courseid)           .child('lectures')).$add(lecture);       },       get: function(courseid, lectureid) {         return $firebaseobject(ref.child('courses')          .child(courseid).child('lectures').child(lectureid));       },       fromcourse: function(courseid) {         return $firebasearray(ref.child('courses')           .child(courseid).child('lectures'));       },       delete: function(courseid,lecture) {         return $firebasearray(ref.child('courses').child(courseid)           .child('lectures')).$remove(lecture);       }     };      return lecture;   }); 

courses controller:

$scope.deletecourse = function (course) {   course.delete(course); }; 

course controller:

$scope.deletelecture = function (courseid, lecture) {   lecture.delete(courseid, lecture); };  

courses view:

  <table class="table table-striped">     <thead>       <tr>         <th></th>       </tr>     </thead>     <tbody>       <tr ng-repeat="course in courses">         <td>           <button class="btn btn-primary"                   ng-really-click="deletecourse(course)"                   ng-really-message="are sure?">             delete           </button>         </td>       </tr>     </tbody>   </table> 

course view:

<table class="table table-striped">   <thead>     <th></th>   </thead>   <tbody>     <tr ng-repeat="lecture in lectures">       <td>         <button class="btn btn-primary"                 ng-really-click="deletelecture(course.$id, lecture)"                 ng-really-message="are sure?">           delete         </button>       </td>     </tr>   </tbody> </table> 

this happens if deletelecture(course.$id, lecture.$id).

this code ng-really if curious.

try renaming delete remove, delete can reserved keyword in javascript languages.