User id is not retrievable from BaasUser Object

Once I login with 

BaasUser user = BaasUser.withUsername("{{ USERNAME }}").setPassword("{{ PASSWORD }}");
user.loginSync();

There is no such method like  user.getId()

I can get userId by doing raw request to the login and signup endpoint. But through api there is no way. 

I need to link user with another user as my app contains much complex relationship among users.
