public async Task <IHttpActionResult> GetInstructorsWithCourses()
        {
            var instructorsWithCoursesOut = await _instructorService.GetInstructorsWithCourses();

            return(new Helpers.ActionResultBuilder
                   .CreateActionResult <IEnumerable <InstructorWithCoursesOut> >(Request, instructorsWithCoursesOut, System.Net.HttpStatusCode.OK));
        }