Question 120001 in Firebase Question posted in
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Firebase – How to StreamBuild a single document in flutter

I have this code

  Stream<List<Ticket>> readTicket() => FirebaseFirestore.instance
      .collection('tickets')
      .where("added_by", isEqualTo: member?.uid)
      .snapshots()
      .map(
        (snapshots) => snapshots.docs
            .map(
              (doc) => Ticket.fromJson(
                doc.data(),
              ),
            )
            .toList(),
      );

It does exactly want I wanted to do but I want the one that will return a single document from database instead of list of documents.

Here is the UI

StreamBuilder<List<Ticket>>(
        stream: TicketController().readTicket(),
        builder: (context, snapshot) {
//.......
}
);

I want this code to fetch only the first document and not the list of documents.

Tags:

2

Answers


  1. 0

    Try

     Stream<Ticket> readTicket() => FirebaseFirestore.instance
      .collection('tickets')
      .doc("kkkk")
      .snapshots()
      .map((DocumentSnapshot<Map<String, dynamic>> snapshot) =>
          Ticket.fromJson(snapshot.data()!));

    Then in your UI

    StreamBuilder<Ticket>(
        stream: TicketController().readTicket(),
        builder: (context, snapshot) {
//.......
}
);
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  2. 0

    To fetch one doucment try this code snippet;

    suppose this is your ticket Model class:

    import 'package:cloud_firestore/cloud_firestore.dart';


  class TicketModel{
  final String? ticketId;
  final String? added_by;
  final Timestamp? createAt;

  TicketModel({
    this.ticketId,
    this.added_by,
    this.createAt,
  });

  factory TicketModel.fromSnapshot(DocumentSnapshot snapshot) {
    return TicketModel(
      ticketId: snapshot.get('ticketId'),
      added_by: snapshot.get('added_by'),
      createAt: snapshot.get('createAt'),
    );
  }

  Map<String, dynamic> toDocument() {
    return {
      "ticketId": ticketId,
      "added_by": added_by,
      "createAt": createAt,
    };
  }
}

    1. Create Stream method like below:

       Stream<List<TicketModel>> readTicket(String uid) {
return FirebaseFirestore.instance
    .collection("tickets")
    .where("added_by", isEqualTo: uid)
    .limit(1).snapshots().map(
    (querySnapshot) => 
        querySnapshot.docs.map((e) => 
            TicketModel.fromSnapshot(e)).toList());

      }

    2. Now call readTicket method check code snippet

       StreamBuilder<List<TicketModel>>(  
     stream: readTicket("user_id"),  
    builder: (context, snapshot) {  
      if (snapshot.hasData == false) { 
         return centerProgressBarIndicator();  
      } 
       if (snapshot.data!.isEmpty) {  
        return Container();  
       }  
         final ticketData = snapshot.data!.first; 
      return Column(  
         children: [
             Text("TicketId: ${ticketData.ticketId}"),  
             Text("added_by: ${ticketData.added_by}"),  
           ], 
         ); 
       },
     )
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