CODEWITHSUNDEEP
fluttergoogle-cloud-platformgoogle-cloud-firestore
reeco
reeco

Reputation: 57

(Flutter Firestore) Field does not exist within DocumentSnapshotPlatform

I'm getting an error when trying to retrieve data from a subcollection. The firestore db is as follows -> users; doc uid; messages; loans approved; loans approved.

I have double checked that I typed the doc and collections correctly so what am I missing?

Any suggestions would be appreciated.

Thank you

firestore screenshot

import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/material.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

class MessagesScreen extends StatefulWidget {
  @override
  MessagesScreenState createState() => MessagesScreenState();
}

FirebaseAuth _auth = FirebaseAuth.instance;
final uid = _auth.currentUser!.uid;
var boldFont = TextStyle(fontFamily: 'Inter', fontWeight: FontWeight.w600);

class MessagesScreenState extends State<MessagesScreen> {
  final db = FirebaseFirestore.instance
      .collection('users')
      .doc(uid)
      .collection('Messages')
      .snapshots();

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          titleSpacing: 30,
          automaticallyImplyLeading: false,
          backgroundColor: Color.fromRGBO(1, 67, 55, 1),
          toolbarHeight: 100,
          title: new Text(
            'Messages',
            style: TextStyle(
                color: Color.fromRGBO(255, 255, 255, 1),
                fontFamily: 'Poppins',
                fontSize: 25,
                letterSpacing: 1.2,
                fontWeight: FontWeight.bold,
                height: 1),
          ),
        ),
        body: StreamBuilder<QuerySnapshot>(
          stream: db,
          builder: (context, snapshot) {
            if (!snapshot.hasData)
              return const Center(
                child: CircularProgressIndicator(),
              );
            return ListView.builder(
                itemCount: snapshot.data!.docs.length,
                itemBuilder: (BuildContext context, int index) {
                  return snapshot.data!.docs[index]['Loans approved']
                      ['Loans overdue']['Loans paid'];
                });
          },
        ));
  }
}

Upvotes: 1

Views: 245

Answers (1)

Renaud Tarnec
Renaud Tarnec

Reputation: 83093

The reason is that you define the Stream (your db variable) as

FirebaseFirestore.instance
      .collection('users')
      .doc(uid)
      .collection('Messages')
      .snapshots();

Based on your screenshot, there is one Loans approved document in this Messages collection which does not have any data. This document has a Loans approved subcollection which, in turns, contains a Loans approved document. It is this doc that contains the fields (Interest, Loan amount, etc.).

So defining your Stream as follow should do the trick:

FirebaseFirestore.instance
      .collection('users')
      .doc(uid)
      .collection('Messages')
      .doc('Loans approved')
      .collection('Loans approved')
      .snapshots();

PS: I would advise you to use the camelCase convention when writing collections, docs and field names.

Upvotes: 1

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