firebase - “QuerySnapshot”类没有实例方法“call”。接收方：“QuerySnapshot”实例尝试调用：call()

Question

构建时引发了以下 NoSuchMethodError：“QuerySnapshot”类没有实例方法“call”。接收方：“QuerySnapshot”实例尝试调用：call()

抛出异常时，这是堆栈：#0 Object.noSuchMethod (dart:core-patch/object_patch.dart:51:5) #1 _HomekitchenListState.build.. (package:pigeon/cook_pages/homekitchen_listpage.dart:26 :62) #2 SliverChildBuilderDelegate.build (package:flutter/src/widgets/sliver.dart:449:22) #3 SliverMultiBoxAdaptorElement._build (package:flutter/src/widgets/sliver.dart:1130:28) #4 SliverMultiBoxAdaptorElement .createChild。（包：flutter/src/widgets/sliver.dart:1143:55）

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

class HomekitchenList extends StatefulWidget {
  @override
  _HomekitchenListState createState() => _HomekitchenListState();
}

class _HomekitchenListState extends State<HomekitchenList> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: StreamBuilder(
        stream:
            FirebaseFirestore.instance.collection("Homekitchens").snapshots(),
        builder: (context, snapshot) {
          if (!snapshot.hasData) {
            print("snapshot from homecooks doesnt have any data");
            return Text(
                "snapshot from homecooks doesnt have any data"); //replace with popup in future
          } else {
            return ListView.builder(
              itemCount: snapshot.data.docs.length,
              itemBuilder: (context, index) {
                DocumentSnapshot homekitchens = snapshot.data().docs[index];
                print(homekitchens);
                //var homekitchens= kitchencollection.data()[index];
                return Padding(
                  padding:
                      const EdgeInsets.symmetric(horizontal: 13, vertical: 8),
                  child: Container(
                    decoration: BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.only(
                          topLeft: Radius.circular(30),
                          topRight: Radius.circular(30),
                          // ignore: missing_return, missing_return, missing_return, missing_return
                          bottomLeft: Radius.circular(30),
                          bottomRight: Radius.circular(30)),
                      boxShadow: [
                        BoxShadow(
                          color: Colors.grey.withOpacity(0.5),
                          spreadRadius: 5,
                          blurRadius: 7,
                          offset: Offset(0, 3), // changes position of shadow
                        ),
                      ],
                    ),
                    child: Container(
                      width: MediaQuery.of(context).size.width,
                      height: 100,
                      decoration: BoxDecoration(
                        color: Colors.white,
                        borderRadius: BorderRadius.only(
                            topLeft: Radius.circular(20),
                            topRight: Radius.circular(20),
                            bottomLeft: Radius.circular(20),
                            bottomRight: Radius.circular(20)),
                      ),
                      child: Text(
                        "${homekitchens.id}",
                        style: TextStyle(
                            fontFamily: "Comfortaa",
                            // ignore: missing_return
                            fontSize: 30),
                      ),
                    ),
                  ),
                );
              },
            );
          }
        },
      ),
    );
  }
}

标签： firebaseflutterdartgoogle-cloud-firestorenosql

Answer 1

DocumentSnapshot homekitchens = snapshot.data().docs[index];- 这里data()应该改成data 信用 - Muthu Thavamani