Angular $ q prom Error: object is not a function

Question

Angular $ q prom Error: object is not a function

I have a factory method that has $ http (async task), so I used the promise of $ q and the following TypeError: object is not a function@line error occurred: return $ q (funtion ....)

written using the promise API:

service.fetch = function(query) {
    return $q(function(resolve, reject){
        $http({ url: srcset[query], method: 'GET'}).success(function(db){
            resolve(db);
        });
    });
};

but if it is written using the Deferred API:

service.fetch = function(query) {
    var deferred = $q.defer();
    $http({ url: srcset[query], method: 'GET'}).success(function(db){
        deferred.resolve(db);
    });
    return deferred.promise;
};