$resource PUT operation not extracting id

I can't seem to get an "id" to come through to the $resource function from the controller. Here is the offending code...

Controller:

$scope.update_user_extra = function () {
    UserExtraResource.update($scope.user_extra_details, function (data) {
        $scope.user_extra_details = data;
        $scope.user_extra_details = {mobile:data.mobile,
                                     landline:data.landline,
                                     position:data.position, 
                                     notes:data.notes, 
                                     language:data.language};
    });
};

Resource:

module.exports = function ($resource) {
    return $resource('/api/user_extra/:id/', { id: '@_id' }, {      
        details: {method: 'GET', url: '/api/user_extra/details'},
        update: {method: 'PUT'}
    });
};  

The GET works fine but the custom PUT returns:

http://127.0.0.1:8000/api/user_extra/ 404 (Not Found)

hardcoding the id like:

return $resource('/api/user_extra/1/', { id: '@_id' }, {  

works fine. Any help is much appreciated!!

hmm ... changing this line to:

return $resource('/api/user_extra/:id/', { id: ̶'̶@̶_̶i̶d̶'̶ '@id' }, {

seems to have done it. Thank you very much!

If the default parameter value is prefixed with @, then the value for that parameter will be extracted from the corresponding property on the data object. For example, if the defaultParam object is {someParam: '@someProp'} then the value of someParam will be data.someProp.

In the above question, the PUT operation was trying to extract the property _id of the data object when the name of the property was actually id.

For more information, see AngularJS $resource API Reference.