（执行updateData时出错，NOT_FOUND：没有要更新的文档：
我进入Feed屏幕时遇到此错误，您能告诉我什么吗？ feedsScreen应该向我显示我关注的人的所有帖子，但是它并没有显示任何内容，只是空白屏幕，并且在控制台中出现错误。
这是错误
Error performing updateData, NOT_FOUND: No document to update: projects/flutter-instagram-clone-c2f63/databases/(default)/documents/users/euZNNwshi6C1GsDW3ONJ, null)
这是供稿屏幕代码
import 'package:flutter/material.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:jobly10/models/post_model.dart';
import 'package:jobly10/models/user_data.dart';
import 'package:jobly10/models/user_model.dart';
import 'package:jobly10/services/database_service.dart';
import 'package:jobly10/utilities/constants.dart';
import 'package:jobly10/widgets/post_view.dart';
import 'package:provider/provider.dart';
import 'comments_screen.dart';
import 'edit_profile_screen.dart';
class ProfileScreen extends StatefulWidget {
static final String id = 'profile_screen';
final String currentUserId;
final String userId;
ProfileScreen({this.currentUserId, this.userId});
@override
_ProfileScreenState createState() => _ProfileScreenState();
}
class _ProfileScreenState extends State<ProfileScreen> {
bool _isFollowing = false;
int _followerCount = 0;
int _followingCount = 0;
List<Post> _posts = [];
int _displayPosts = 0; // 0 - grid, 1 - column
User _profileUser;
@override
void initState() {
super.initState();
_setupIsFollowing();
_setupFollowers();
_setupFollowing();
_setupPosts();
_setupProfileUser();
}
_setupIsFollowing() async {
bool isFollowingUser = await DatabaseService.isFollowingUser(
currentUserId: widget.currentUserId,
userId: widget.userId,
);
if (!mounted) return;
setState(() {
_isFollowing = isFollowingUser;
});
}
_setupFollowers() async {
int userFollowerCount = await DatabaseService.numFollowers(widget.userId);
if (!mounted) return;
setState(() {
_followerCount = userFollowerCount;
});
}
_setupFollowing() async {
int userFollowingCount = await DatabaseService.numFollowing(widget.userId);
if (!mounted) return;
setState(() {
_followingCount = userFollowingCount;
});
}
_setupPosts() async {
List<Post> posts = await DatabaseService.getUserPosts(widget.userId);
if (!mounted) return;
setState(() {
_posts = posts;
});
}
_setupProfileUser() async {
User profileUser = await DatabaseService.getUserWithId(widget.userId);
if (!mounted) return;
setState(() {
_profileUser = profileUser;
});
}
_followOrUnfollow() {
if (_isFollowing) {
_unfollowUser();
} else {
_followUser();
}
}
_unfollowUser() {
DatabaseService.unfollowUser(
currentUserId: widget.currentUserId,
userId: widget.userId,
);
if (!mounted) return;
setState(() {
_isFollowing = false;
_followerCount--;
});
}
_followUser() {
DatabaseService.followUser(
currentUserId: widget.currentUserId,
userId: widget.userId,
);
if (!mounted) return;
setState(() {
_isFollowing = true;
_followerCount++;
});
}
_displayButton(User user) {
return user.id == Provider.of<UserData>(context).currentUserId
? Container(
width: 200.0,
child: FlatButton(
onPressed: () => Navigator.push(
context,
MaterialPageRoute(
builder: (_) => EditProfileScreen(
user: user,
),
),
),
color: Colors.deepPurpleAccent,
textColor: Colors.white,
child: Text(
'Editar Pefil',
style: TextStyle(fontSize: 18.0, fontFamily: 'Varela'),
),
),
)
: Container(
width: 200.0,
child: FlatButton(
onPressed: _followOrUnfollow,
color: _isFollowing ? Colors.grey[200] : Colors.blue,
textColor: _isFollowing ? Colors.black : Colors.white,
child: Text(
_isFollowing ? 'Unfollow' : 'Follow',
style: TextStyle(fontSize: 18.0),
),
),
);
}
_buildProfileInfo(User user) {
return Column(
children: <Widget>[
Padding(
padding: EdgeInsets.fromLTRB(30.0, 30.0, 30.0, 0.0),
child: Row(
children: <Widget>[
CircleAvatar(
radius: 50.0,
backgroundColor: Colors.grey,
backgroundImage: user.profileImageUrl.isEmpty
? AssetImage('assets/images/user.png')
: CachedNetworkImageProvider(user.profileImageUrl),
),
Expanded(
child: Column(
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
Column(
children: <Widget>[
Text(
_posts.length.toString(),
style: TextStyle(
fontSize: 18.0,
fontWeight: FontWeight.w600,
),
),
Text(
'posts',
style: TextStyle(color: Colors.black54),
),
],
),
Column(
children: <Widget>[
Text(
_followerCount.toString(),
style: TextStyle(
fontSize: 18.0,
fontWeight: FontWeight.w600,
),
),
Text(
'followers',
style: TextStyle(color: Colors.black54),
),
],
),
Column(
children: <Widget>[
Text(
_followingCount.toString(),
style: TextStyle(
fontSize: 18.0,
fontWeight: FontWeight.w600,
),
),
Text(
'following',
style: TextStyle(color: Colors.black54),
),
],
),
],
),
_displayButton(user),
],
),
)
],
),
),
Padding(
padding: EdgeInsets.symmetric(horizontal: 30.0, vertical: 10.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Text(
user.nickname,
style: TextStyle(
fontSize: 18.0,
fontWeight: FontWeight.bold,
),
),
SizedBox(height: 5.0),
Container(
height: 80.0,
child: Text(
user.bio,
style: TextStyle(fontSize: 15.0),
),
),
Divider(),
],
),
),
],
);
}
_buildToggleButtons() {
return Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: <Widget>[
IconButton(
icon: Icon(Icons.grid_on),
iconSize: 30.0,
color: _displayPosts == 0
? Theme.of(context).primaryColor
: Colors.grey[300],
onPressed: () => setState(() {
_displayPosts = 0;
}),
),
IconButton(
icon: Icon(Icons.list),
iconSize: 30.0,
color: _displayPosts == 1
? Theme.of(context).primaryColor
: Colors.grey[300],
onPressed: () => setState(() {
_displayPosts = 1;
}),
),
],
);
}
_buildTilePost(Post post) {
return GridTile(
child: GestureDetector(
onTap: () => Navigator.push(
context,
MaterialPageRoute(
builder: (_) => CommentsScreen(
post: post,
likeCount: post.likeCount,
),
),
),
child: Image(
image: CachedNetworkImageProvider(post.imageUrl),
fit: BoxFit.cover,
),
),
);
}
_buildDisplayPosts() {
if (_displayPosts == 0) {
// Grid
List<GridTile> tiles = [];
_posts.forEach(
(post) => tiles.add(_buildTilePost(post)),
);
return GridView.count(
crossAxisCount: 3,
childAspectRatio: 1.0,
mainAxisSpacing: 2.0,
crossAxisSpacing: 2.0,
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
children: tiles,
);
} else {
// Column
List<PostView> postViews = [];
_posts.forEach((post) {
postViews.add(
PostView(
currentUserId: widget.currentUserId,
post: post,
author: _profileUser,
),
);
});
return Column(children: postViews);
}
}
@override
Widget build(BuildContext context) {
return Scaffold(
backgroundColor: Colors.white,
body: FutureBuilder(
future: usersRef.document(widget.userId).get(),
builder: (BuildContext context, AsyncSnapshot snapshot) {
if (!snapshot.hasData) {
return Center(
child: CircularProgressIndicator(),
);
}
User user = User.fromDoc(snapshot.data);
return ListView(
children: <Widget>[
_buildProfileInfo(user),
_buildToggleButtons(),
Divider(),
_buildDisplayPosts(),
],
);
},
),
);
}
}
这是帖子查看小工具
import 'dart:async';
import 'package:animator/animator.dart';
import 'package:cached_network_image/cached_network_image.dart';
import 'package:flutter/material.dart';
import 'package:jobly10/models/post_model.dart';
import 'package:jobly10/models/user_model.dart';
import 'package:jobly10/screens/comments_screen.dart';
import 'package:jobly10/screens/profile_screen.dart';
import 'package:jobly10/services/database_service.dart';
class PostView extends StatefulWidget {
final String currentUserId;
final Post post;
final User author;
PostView({this.currentUserId, this.post, this.author});
@override
_PostViewState createState() => _PostViewState();
}
class _PostViewState extends State<PostView> {
int _likeCount = 0;
bool _isLiked = false;
bool _heartAnim = false;
@override
void initState() {
super.initState();
_likeCount = widget.post.likeCount;
_initPostLiked();
}
@override
void didUpdateWidget(PostView oldWidget) {
super.didUpdateWidget(oldWidget);
if (oldWidget.post.likeCount != widget.post.likeCount) {
_likeCount = widget.post.likeCount;
}
}
_initPostLiked() async {
bool isLiked = await DatabaseService.didLikePost(
currentUserId: widget.currentUserId,
post: widget.post,
);
if (mounted) {
setState(() {
_isLiked = isLiked;
});
}
}
_likePost() {
if (_isLiked) {
// Unlike Post
DatabaseService.unlikePost(
currentUserId: widget.currentUserId, post: widget.post);
setState(() {
_isLiked = false;
_likeCount = _likeCount - 1;
});
} else {
// Like Post
DatabaseService.likePost(
currentUserId: widget.currentUserId, post: widget.post);
setState(() {
_heartAnim = true;
_isLiked = true;
_likeCount = _likeCount + 1;
});
Timer(Duration(milliseconds: 350), () {
setState(() {
_heartAnim = false;
});
});
}
}
@override
Widget build(BuildContext context) {
return Column(
children: <Widget>[
GestureDetector(
onTap: () => Navigator.push(
context,
MaterialPageRoute(
builder: (_) => ProfileScreen(
currentUserId: widget.currentUserId,
userId: widget.post.authorId,
),
),
),
child: Container(
padding: EdgeInsets.symmetric(
horizontal: 16.0,
vertical: 10.0,
),
child: Row(
children: <Widget>[
CircleAvatar(
radius: 25.0,
backgroundColor: Colors.grey,
backgroundImage: widget.author.profileImageUrl.isEmpty
? AssetImage('assets/images/user_placeholder.jpg')
: CachedNetworkImageProvider(
widget.author.profileImageUrl),
),
SizedBox(width: 8.0),
Text(
widget.author.nickname,
style: TextStyle(
fontSize: 18.0,
fontWeight: FontWeight.w600,
),
)
],
),
),
),
GestureDetector(
onDoubleTap: _likePost,
child: Stack(
alignment: Alignment.center,
children: <Widget>[
Container(
height: MediaQuery.of(context).size.width,
decoration: BoxDecoration(
image: DecorationImage(
image: CachedNetworkImageProvider(widget.post.imageUrl),
fit: BoxFit.cover,
),
),
),
_heartAnim
? Animator(
duration: Duration(milliseconds: 300),
tween: Tween(begin: 0.5, end: 1.4),
curve: Curves.elasticOut,
builder: (anim) => Transform.scale(
scale: anim.value,
child: Icon(
Icons.favorite,
size: 100.0,
color: Colors.red[400],
),
),
)
: SizedBox.shrink(),
],
),
),
Padding(
padding: EdgeInsets.symmetric(horizontal: 8.0),
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
Row(
children: <Widget>[
IconButton(
icon: _isLiked
? Icon(
Icons.favorite,
color: Colors.red,
)
: Icon(Icons.favorite_border),
iconSize: 30.0,
onPressed: _likePost,
),
IconButton(
icon: Icon(Icons.comment),
iconSize: 30.0,
onPressed: () => Navigator.push(
context,
MaterialPageRoute(
builder: (_) => CommentsScreen(
post: widget.post,
likeCount: _likeCount,
),
),
),
),
],
),
Padding(
padding: EdgeInsets.symmetric(horizontal: 12.0),
child: Text(
'${_likeCount.toString()} likes',
style: TextStyle(
fontSize: 16.0,
fontWeight: FontWeight.bold,
),
),
),
SizedBox(height: 4.0),
Row(
children: <Widget>[
Container(
margin: EdgeInsets.only(
left: 12.0,
right: 6.0,
),
child: Text(
widget.author.nickname,
style: TextStyle(
fontSize: 16.0,
fontWeight: FontWeight.bold,
),
),
),
Expanded(
child: Text(
widget.post.caption,
style: TextStyle(
fontSize: 16.0,
),
overflow: TextOverflow.ellipsis,
),
),
],
),
SizedBox(height: 12.0),
],
),
),
],
);
}
}
这是数据库
static Future<List<Post>> getFeedPosts(String userId) async {
QuerySnapshot feedSnapshot = await feedsRef
.document(userId)
.collection('userFeed')
.orderBy('timestamp', descending: true)
.getDocuments();
List<Post> posts =
feedSnapshot.documents.map((doc) => Post.fromDoc(doc)).toList();
return posts;
}
This is the Post model
import 'package:cloud_firestore/cloud_firestore.dart';
class Post {
final String id;
final String imageUrl;
final String caption;
final int likeCount;
final String authorId;
final Timestamp timestamp;
Post({
this.id,
this.imageUrl,
this.caption,
this.likeCount,
this.authorId,
this.timestamp,
});
factory Post.fromDoc(DocumentSnapshot doc) {
return Post(
id: doc.documentID,
imageUrl: doc['imageUrl'],
caption: doc['caption'],
likeCount: doc['likeCount'],
authorId: doc['authorId'],
timestamp: doc['timestamp'],
);
}
}
日志
Performing hot reload...
Syncing files to device SM A305G...
Reloaded 0 of 989 libraries in 771ms.
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 0
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 1
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 0
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 1
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 0
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 1
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 0
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 1
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 0
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 1
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 0
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 1
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 0
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 1
I/flutter (21125): token: dlwF3XAN-IU:APA91bHppNO3Ku6EzTyl_cVJnCA6Vq9lZ3CxzzBw1BJ57eN9G_bEeVtKN6YOsBzMQ0xO6C3q4FOx0YmnPW8a7DDxpRZUrWndNQwc6SNH2ek2vw_DusdBfQuxKzbkt73wF5ksTn-ssmus
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 0
D/ViewRootImpl@16cc112[MainActivity](21125): ViewPostIme pointer 1
E/flutter (21125): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: PlatformException(Error performing updateData, NOT_FOUND: No document to update: projects/flutter-instagram-clone-c2f63/databases/(default)/documents/users/euZNNwshi6C1GsDW3ONJ, null)
E/flutter (21125): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:569:7)
E/flutter (21125): #1 MethodChannel.invokeMethod (package:flutter/src/services/platform_channel.dart:321:33)
E/flutter (21125): <asynchronous suspension>
E/flutter (21125): #2 MethodChannelDocumentReference.updateData (package:cloud_firestore_platform_interface/src/method_channel/method_channel_document_reference.dart:41:43)
E/flutter (21125): #3 DocumentReference.updateData (package:cloud_firestore/src/document_reference.dart:60:10)
E/flutter (21125): #4 ListChatScreenState.registerNotification.<anonymous closure> (package:jobly10/chat_implementation/ListChat_screen.dart:73:12)
E/flutter (21125): #5 _rootRunUnary (dart:async/zone.dart:1134:38)
E/flutter (21125): #6 _CustomZone.runUnary (dart:async/zone.dart:1031:19)
E/flutter (21125): #7 _FutureListener.handleValue (dart:async/future_impl.dart:139:18)
E/flutter (21125): #8 Future._propagateToListeners.handleValueCallback (dart:async/future_impl.dart:680:45)
E/flutter (21125): #9 Future._propagateToListeners (dart:async/future_impl.dart:709:32)
E/flutter (21125): #10 Future._completeWithValue (dart:async/future_impl.dart:524:5)
E/flutter (21125): #11 _AsyncAwaitCompleter.complete (dart:async-patch/async_patch.dart:32:15)
E/flutter (21125): #12 _completeOnAsyncReturn (dart:async-patch/async_patch.dart:290:13)
E/flutter (21125): #13 FirebaseMessaging.getToken (package:firebase_messaging/firebase_messaging.dart)
E/flutter (21125): <asynchronous suspension>
E/flutter (21125): #14 ListChatScreenState.registerNotification (package:jobly10/chat_implementation/ListChat_screen.dart:68:23)
E/flutter (21125): #15 ListChatScreenState.initState (package:jobly10/chat_implementation/ListChat_screen.dart:47:5)
E/flutter (21125): #16 StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4355:58)
E/flutter (21125): #17 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5)
E/flutter (21125): #18 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14)
E/flutter (21125): #19 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12)
E/flutter (21125): #20 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5445:14)
E/flutter (21125): #21 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14)
E/flutter (21125): #22 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12)
E/flutter (21125): #23 SingleChildRenderObjectElement.mount (package:flutter/src/widgets/framework.dart:5445:14)
E/flutter (21125): #24 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14)
E/flutter (21125): #25 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12)
E/flutter (21125): #26 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16)
E/flutter (21125): #27 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5)
E/flutter (21125): #28 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4206:5)
E/flutter (21125): #29 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5)
E/flutter (21125): #30 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14)
E/flutter (21125): #31 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12)
E/flutter (21125): #32 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16)
E/flutter (21125): #33 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5)
E/flutter (21125): #34 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4206:5)
E/flutter (21125): #35 ComponentElement.mount (package:flutter/src/widgets/framework.dart:4201:5)
E/flutter (21125): #36 ParentDataElement.mount (package:flutter/src/widgets/framework.dart:4617:11)
E/flutter (21125): #37 Element.inflateWidget (package:flutter/src/widgets/framework.dart:3194:14)
E/flutter (21125): #38 Element.updateChild (package:flutter/src/widgets/framework.dart:2988:12)
E/flutter (21125): #39 ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4243:16)
E/flutter (21125): #40 Element.rebuild (package:flutter/src/widgets/framework.dart:3947:5)
E/flutter (21125): #41 ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4206:5)
E/flutter (21125): #42 StatefulElement._firstBuild (package:flutter/src/widgets/framework.d
这是我在Firebase中的数据库
0 个答案:
没有答案
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