How to get data from Firestore at Flutter-CodePudding

I am new at Flutter and Firebase, I just want to fetch data from Firestore, for example here, I just want to fetch the value of "KullaniciAdi" from the "[email protected]" document, as simply as possible.

CodePudding user response：

StreamBuilder<QuerySnapshot>(
        stream: viewDetails(),
        builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
          if (snapshot.hasData) {
            for (int i = 0; i < snapshot.data!.docs.length; i  ) {
              if (snapshot.data!.docs[i].id == "[email protected]") {
                final DocumentSnapshot e = snapshot.data!.docs[i];
                dersiniz = "${e["Dersiniz"]}";
                return Center(child: Text(dersiniz),);
                
                
                
              }
            }
          },
          )


static Stream<QuerySnapshot> viewDetails() {
    CollectionReference notesItemCollection = FirebaseFirestore.instance.collection("KullaniciAdi");

    return notesItemCollection.snapshots();
  }

used like this

CodePudding user response：

I think the structure of the folders is confusing, in general the documents are IDs, like this:

Example:

Collection (users) - Document (sALkf983l3j5RGjsk82lfds) - Fields (name, email, gender)

In this case you could make a call like this:

final FirebaseFirestore firestore = FirebaseFirestore.instance;

final DocumentSnapshot docUser =
          await firestore.collection('users').doc('sALkf983l3j5RGjsk82lfds').get();

You can do it:

final FirebaseFirestore firestore = FirebaseFirestore.instance;

final DocumentSnapshot docUser =
          await firestore.collection('KullaniciAdi').doc('[email protected]').get();

Editing:

To fetch a specific field value:

 final ref =  await FirebaseFirestore.instance
        .doc('users/$userId').get();
    final value = ref.get('name');