LiveData observeForever not updating with the room changes

Question

following observeForever not giving any data when - User is logged out (There is no user in the database) - Login and insert a user into the db. (Here observeForever is not being triggered)

mUserDao.getCompleteUser().observeForever(this::updateCompleteUser);

DAO

@Dao
public interface UserDao extends BaseDao<User> {
@Query("SELECT * FROM user")
@Transaction
LiveData<CompleteUser> getCompleteUser();
}

But @Query("SELECT * FROM user") @Transaction Flowable<CompleteUser> getCompleteUser();

is working which does not return null for the logged-out state (expected behavior)

User

@Entity(tableName = "user")
public class User implements Serializable {

    @PrimaryKey
    @NonNull
    String uid;

    String email;
}

Complete User

public class CompleteUser {
    @Embedded
    User user;

    @Relation(parentColumn = "uid", entityColumn = "userId", entity = Address.class)
    List<Address> addresses;
}

Answer 1

为了得到一个User与List<Address> ，你可以看看这个看看在处理这样的关系。