How do I check if a firebase database value exists?

Question

I\'m using the Realtime Database with Google\'s Firebase, and I\'m trying to check if a child exists.

My database is structured as the following

- /          


        

Answer 1

You can check snapshot.exists value.

NSString *roomId = @"room1";
FIRDatabaseReference *refUniqRoom = [[[[FIRDatabase database] reference]
                                      child:@"rooms"]
                                     child:roomId];

[refUniqRoom observeSingleEventOfType:FIRDataEventTypeValue
                            withBlock:^(FIRDataSnapshot * _Nonnull snapshot) {

    bool isExists = snapshot.exists;
    NSLog(@"%d", isExists);
}];