angularjs，http怎样实现传值

var noya=function(){
          var defer=$q.defer();
        
        $http.get(baseURL + "groups/new").then(function(res) {
         if(res.data.group){
         group_id = res.data.group;
         defer.resolve(group_id)
        }
        else{
            defer.reject()
        }
       

        });
         return defer.promise
    }
    var promise=noya();

    promise.then(function(group_id){
        console.log(group_id);
         $localStorage.TRIP = {
                title: "",
                trip_target: [],
                start_time: Math.round(Date.now() / 1000) + 86400,
                end_time: Math.round(Date.now() / 1000) + 86400,
                detail: "[]",
                set_meals: [],
                custom_trip: false,
                group_id: group_id,
                private_users: 0,
                latitude: 0,
                longitude: 0,
                sponsor_ids: [],
                travel_id: "",
                _id: group_id,
               
            }
        $state.go('app.dashboard.targetEdit')
    },function(){

    });
为了把http get到的group_id值传到$localStorage.TRIP中，不得不写了一个promise方法，请问有没有什么更简单的办法把这个值传出来呢？

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为什么不直接在http.get().then()回调函数里面设置$localStorage.TRIP？