public DoctrinaGroupRepository(DoctrinaDBContext db, UserManager <DoctrinaUser> userManager, IHostingEnvironment hostingEnvironment)
 {
     _db                 = db;
     _userManager        = userManager;
     _hostingEnvironment = hostingEnvironment;
 }
 public DoctrinaUserRepository(DoctrinaDBContext db)
 {
     _db = db;
 }