javascript - Count number of elements in $resource.query() object -

i'm trying count number of elements returned $resouce.query() object, can increment , use id next object saved.

following service communicate server:

eventsapp.factory('eventdata', function($resource) {     var resource = $resource('/data/event/:id', {id: '@id'});     return {         getevent: function(eventid) {             return resource.get({id: eventid});         },          saveevent: function(event) {             var count = 0;             resource.query(function(data) {                 count = data.length; // accessible here!             });             event.id = count; // not accessible here!             return resource.save(event);          },          getallevents: function() {             var count = 0;             var lol = resource.query(function(data) {                 count = data.length;             });             console.log(count);             return resource.query();         }      } }); 

however, mentioned in comments, i'm unable access length property. solutions?

by looking @ code getting resource.query executes callback function asynchronously because of event.id = count; executed first , callback executed. if want access data.length can use $q , create defer. , resolve deferred object.