'How to update data from Firestore in Flutter?

I want to use update method in FirebaseFirestore instance but it is not working. I have intialized id as String i.e String Id in the stateful widget

This is ViewData Page which has a button Widget

class ViewData extends StatefulWidget {
  const ViewData({Key? key, required this.document, required this.id})
      : super(key: key);

  final Map<String, dynamic> document;
  final String id;

Widget button() {
    return InkWell(
      onTap: () {
        FirebaseFirestore.instance.collection("mytask").doc(widget.id).update({
          "title": titleController.text,
          "description": descriptionController.text,
          "type": type,
          "category": category,
          "format": format,
        });
        Navigator.pop(context);
      },
      child: Container(
        height: 56,
        width: MediaQuery.of(context).size.width,
        decoration: BoxDecoration(
          borderRadius: BorderRadius.circular(15),
        ),
        child: const Center(
          child: Text(
            "Update",
            style: TextStyle(
              color: Colors.white,
              fontSize: 18,
              fontWeight: FontWeight.w600,
            ),
          ),
        ),
      ),
    );
  }

There is another page named Homepage where Snapshot has been written.

 return ListView.builder(
                  itemCount: snapshot.data.docs.length,
                  itemBuilder: (context, index) {
                    Map<String, dynamic> document = snapshot.data.docs[index]
                        .data() as Map<String, dynamic>;
                    return InkWell(
                      onTap: () {
                        Navigator.push(
                            context,
                            MaterialPageRoute(
                                builder: (builder) =>
                                    ViewData(
                                      document: document,
                                      id : snapshot.data.docs[index].id,
                                    ),
                            ),
                        );
                      },

Help me find the correct document id.

flutterjavaandroidgoogle-cloud-firestoreconcurrencymaterialdatepicker


Solution 1:[1]

use set() method if you want change many data in doc, set will create new document if not exists or overwrite new data in document

        FirebaseFirestore.instance.collection("mytask").doc(widget.id).set({
          "title": titleController.text,
          "description": descriptionController.text,
          "type": type,
          "category": category,
          "format": format,
        });

See more how to add data to cloud firestore

Solution 2:[2]

Can you try the below code by using the snapshot type

builder: (BuildContext context,
                            AsyncSnapshot<QuerySnapshot> snapshot) {
                          if (snapshot.hasData &&
                              snapshot.data.docs.length != 0) {
                            List<DocumentSnapshot> snap =
                                snapshot.data.docs;
    return ListView.builder(
                  itemCount: snapshot.data.docs.length,
                  itemBuilder: (context, index) {
                    Map<String, dynamic> document = snapshot.data.docs[index]
                        .data() as Map<String, dynamic>;
                    return InkWell(
                      onTap: () {
                        Navigator.push(
                            context,
                            MaterialPageRoute(
                                builder: (builder) =>
                                    ViewData(
                                      document: document,
                                      id : snap[index].id,
                                    ),
                            ),
                        );
                      },
    }

Sources

This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.

Source: Stack Overflow

Solution Source
Solution 1
Solution 2 Gejaa

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