How to handle async code that calls another async code [AngularJs]

I have factory that's using indexedDB and method getRecipe that needs this indexed db to receive data.

Problem is that indexedDB returns it's instance in asynchronous call and getRecipe is another method that returns it's value in asynchronous call.

I try to solve it via promises, but I failed.

app.factory('RecipesStorage', ['$q', function($q) { 
var getDb = function () {
   var deferred = $q.defer();

   var db;
   var request = indexedDB.open('recipes', 1);

   request.onupgradeneeded = function (e) {
       console.log('Upgrading indexedDb');
       var thisDb = e.target.result;

       if (!thisDb.objectStoreNames.contains('recipe')) {
           thisDb.createObjectStore('recipe');
       }
   }

   request.onsuccess = function (e) {
       db = e.target.result;
       window.db = db;
       deferred.resolve(db);
   }

   request.onerror = function (e) {
       console.error('Error when opening indexedDB');
   }

   return deferred.promise;
};

var getRecipe = function (recipeId, callback) {
        getDb().then(function(db) {
            var transaction = db.transaction(['recipe'], 'readonly');
            var objectStore = transaction.objectStore('recipe');

            var data = objectStore.get(recipeId);

            data.onsuccess = function (e) {
                var result = e.target.result;
                console.log('GetRecipe:', result);
                callback(result);
            }

            data.onerror = function (e) {
                console.error('Error retrieving data from indexedDB', e);
            }
        });
};

return {getRecipe:getRecipe};
}]);

But this doesent work. In getRecipe the function in then isn't invoked. I don't know where is problem.