Flowable not emitting when database changes

Question

In Room Database i have an object (User) with id "1" and my DAO is returning a Flowable of this object. After subscribing I call editUser() function.

 @Query ("SELECT * FROM User Where id=:id ")
 Flowable<User> getUser(String id);

 @Update
 void update(User user);

I am not getting any call back (onNext or onComplete) whenever i make a change to this User object and update it in DB.

 public void editUser() {
       User u = new User();
       u.id="1";
       u.age=45;
       appDB.userModel().update(u);
}

 appDB.userModel().getUser("1").subscribe(new Subscriber<User>() {
  @Override
  public void onSubscribe(Subscription s) {
    Log.d(TAG,"onSubscribed");
  }

  @Override
  public void onNext(User user) {
    Log.d(TAG,"onNext");
  }

  @Override
  public void onError(Throwable t) {
    Log.d(TAG,"Error");
  }

  @Override
  public void onComplete() {
    Log.d(TAG,"onComplete");
  }
});

Could anyone please explain to me what am i missing here ?

Have you tried `Flowable>` instead? You can also try something like `Flowable>` although I think that requires guava — EpicPandaForce, Aug 15 '18 at 20:14
@akarnokd: If i use Subscription.OnNext() , does'nt it mean that i am manually asking for the updates ? — Android14, Aug 15 '18 at 20:29
`Subscriber.onNext` is the receiver of events, it doesn't declare when and how many items you want to receive. — akarnokd, Aug 15 '18 at 20:38
@akarnokd: There is one overridden onNext() while subscribing. Could you please tell me how/where exactly should i use Subscriber.onNext. — Android14, Aug 15 '18 at 20:48

score 1 · Accepted Answer · answered Aug 15 '18 at 21:03

Request from the Subscription!

appDB.userModel().getUser("1").subscribe(new Subscriber<User>() {
  @Override
  public void onSubscribe(Subscription s) {
    Log.d(TAG,"onSubscribed");
// ------------------------------------------------------------------------
    s.request(Long.MAX_VALUE);
// ------------------------------------------------------------------------
  }

  @Override
  public void onNext(User user) {
    Log.d(TAG,"onNext");
  }

  @Override
  public void onError(Throwable t) {
    Log.d(TAG,"Error");
  }

  @Override
  public void onComplete() {
    Log.d(TAG,"onComplete");
  }
});

Flowable not emitting when database changes

1 Answers1