无法在flutter中访问Firebase Firestore doc的字段[重复]

Posted 2023-02-23

【中文标题】无法在flutter中访问Firebase Firestore doc的字段[重复]

【英文标题】：Unable to access the fields of Firebase Firestore doc in flutter [duplicate]

【发布时间】：2021-08-06 10:10:28

【问题描述】：

我想访问文档字段，为此我使用以下代码，但出现错误：-

The operator '[]' isn't defined for the type 'Object'. (Documentation)

我的 Cloud Firestore 版本是 cloud_firestore: ^2.1.0

我的代码：-

import 'package:cloud_firestore/cloud_firestore.dart';

class TeamModel

  final String id;
  final String name;
  final String url;
  final String category;
  final String role;

  TeamModel(
    this.id,
    this.name,
    this.url,
    this.category,
    this.role
  );

  factory TeamModel.fromDocument(DocumentSnapshot doc)
  
    return TeamModel(
      id: doc.id,
      name: doc.data()['name'],// I am getting the error on this ['name']
      url: doc.data()['url'], // same error here
      category: doc.data()['category'],// same error here
      role: doc.data()['role'],// same error here
    );
  

【参考方案1】：

不用.data()试试这个

factory TeamModel.fromDocument(DocumentSnapshot doc)
  
    return TeamModel(
      id: doc.id,
      name: doc['name'],
      url: doc['url'],
      category: doc['category'],
      role: doc['role'],
    );