Element added to list in if else but list is empty except if else

[Alper Duzgun]

Hi everyone. I want to if photos liked not added the new list. And I think find the how can i do. If doc exist I can add the list or i can remove the already on user list. But its working only in if else. If I want to read the list except if else method. List is empty. Just working in if else method. How can i find the right solution?

 List<ProfileUsers> usersList = [];

  List<ProfileUsers> likesList = [];

  List<ProfileUsers> _sonucListe = [];

  List<ProfileUsers> get sonucListe => _sonucListe;

  List<ProfileUsers> addUser(ProfileUsers user) {

    likesList.add(user);

    return likesList;

  }

  Future<List<ProfileUsers>> listeOlustur() async {

    /******USERS******/

    var refUser = FirebaseFirestore.instance.collection("users");

    //.where('isActive', isEqualTo: true

    var documentsUser = await refUser.get();

    usersList = documentsUser.docs

        .map((snapshot) => ProfileUsers.fromSnapshot(snapshot))

        .toList();

    usersList.forEach((user) {

      var test = FirebaseFirestore.instance

          .collection('users/2SEHMt5C3POitUCMOj8omnC2PRs1/likes/')

          .doc(user.id);

      test

          .get()

          .then((doc) => {

                if (doc.exists)

                  {

                    //print('???????Document data: ' + doc.id),

                    //usersList.remove(user),

                  }

                else

                  {

                    //print('Böyle bir data yok ' + doc.id),

                    addUser(user),

                    print(sonucListe.length), //OUTPUT : 3

                  },

              })

          .catchError((e) {

        print('ERROR!!! ' + e.toString());

      });

    });

    print(sonucListe.length); //OUTPUT : 0

  }

}

[Suzuki Tomohiro]

Because of Future, your code execute  “print(sonucListe.length); //OUTPUT : 0” before items are added to the list.

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[Alper Duzgun]

Sorry, I think not understand. Can you make example please?

6 Mayıs 2021 Perşembe tarihinde saat 16:59:00 UTC+3 itibarıyla suz...@gmail.com şunları yazdı: