firebase - How to bind a Firestore documents list to a Dropdown menu in Flutter?

Question

I'm having a problem regarding dropdown menus and firestore, how can I bind a list of documents retrieved from firestore to a DropdownButton? Currently I'm having this error:

The argument type '(Map<dynamic, dynamic>) → DropdownMenuItem<String>' can't be assigned to the parameter type '(DocumentSnapshot) → dynamic'.

Code from my widget .dart:

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

class MessageList extends StatelessWidget {
  MessageList({this.firestore});

  final Firestore firestore;
  var _mySelection;

  @override
  Widget build(BuildContext context) {
    return StreamBuilder<QuerySnapshot>(
      stream: firestore.collection('preciso-modelos').snapshots(),
      builder: (BuildContext context, AsyncSnapshot<QuerySnapshot> snapshot) {
        if (!snapshot.hasData) return const Text('Loading...');
        return new DropdownButton<String>(
            isDense: true,
            hint: new Text("Select"),
            value: _mySelection,
            onChanged: (String newValue) {
              print (_mySelection);
            },
            items: snapshot.data.documents.map((Map map) {
              return new DropdownMenuItem<String>(
                value: map["id"].toString(),
                child: new Text(
                  map["name"],
                ),
              );
            }).toList(),
        );},
        );
      }
}

Thanks!

Answer 1

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