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<h3>Flutter snapshot data null. NoSuchMethodError: The getter 'docs' was called on null.</h3>
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<p>Flutter snapshot data null Asking for help, clarification, or responding to other answers. decode(response. stream doesn't have any listeners so StreamBuilder assume that the is no data so he doesn't check, this is the reason for the null. Flutter StreamBuilder with initialData and null-awareness. API docs for the AsyncSnapshot. stream in the initialization. data will never be null, but snapshot. I want to gernate pdf preview in flutter from network url but not finding any way to achieve this. Either fix your data or fix your code. I have gone through similar questions rais StreamBuilder( stream: firestore . I try to implement the Firebase Realtime Database in Flutter and I want to display updated values in realtime. When I tried to connect to the APi, it works just fine, and I got the JSON response from the server. Flutter, display text if firebase data is empty. Snapshot data of FutureBuilder is always null (doesn't show any error) #54061. Ask Question Asked 4 years, 7 months ago. none, null, null) +++++} – Ladino Anselmo. However, I noticed that you are using the package bloc_pattern. uid, required this. value. Flutter/Dart ListView not displaying snapshot. length NoSuchMethodError: The getter 'docs' was called on null. Can anyone explain best practices handling Null values in Dart/Flutter respectively? EDIT: I'm checking if snapshot. data is null in flutter firebase. Actual results: I/flutter ( 8316): ConnectionState. Follow edited Jan 30, 2022 at 7:10. So there is no data and the !snapshot. done to make sure you fetched the Using firebase_database: ^7. ') or adding a null check to the target ('!')" in the line itemCount: snapshot. Commented May 8, 2020 at 13:06. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; So I have been following a tutorial from YouTube and when I was trying to fetch the &quot;username&quot; from the collection named &quot;users&quot; through Stream snapshot, it returns null. init() runApp(MyApp());} Flutter FutureBuilder snapshot. Flutter Futurebuilder snapshot has no data. Looks like maybe because you got a stream builder, so the Snapshot is a AsyncSnapshot<dynamic>, when you grab its . Flutter: Snapshot isn't showing data. hasData is true snapshot. data are showing as null when i try to retrieve from firestore - flutter. Hot Network Questions Should a 10/2 cable for a clothes dryer be upgraded to 10/3 during a renovation? In my flutter code, I am trying to get data from the Firebase Real-Time Database. This can be false even when the asynchronous computation has completed successfully, if the computation did not return a non-null value. child('chat_room'); Thanks Yazeed. data; Guys I am new to flutter, and have been trying to retrieve data from firebase and display it in a gridview using streambuilder. exists indicates whether a I have an api that I'm getting the data for the app, and was trying to use the StatefulWidget and the FutureBuilder. length is null, Flutter. Closed MohiuddinM opened this issue Apr 5, 2020 · 3 comments I/flutter ( 8316): null I/flutter ( 8316): ConnectionState. child(key. Now I'm getting the error Flutter FutureBuilder snapshot. Hot Network Questions How do I interpret multiple linear regression results as % change in dependent variable Any one who are using get_it package and having similar issue, here is the most simple solution. 0 futurebuilder snapshot. data will be null. data![index]; You can also check if the data is null before accessing it like that: if Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I think your future is throwing and this would result in null data in the builder. That because when you request data from the database, you always get a DataSnapshot. how to access snapshot. data to snapshot?. Futubuilder snapshot. com This keeps happening although there is data in the database. Basically I just adjusted this example: snapshot. data == null still its true. Flutter. I am using the Streambuilder widget to build a real-time response screen. The results from a query could change at any time between queries, and the system can not guarantee that any sort of index would be stable. Does that mean the placeholder data that gets shown to the user when the data is awaiting? If that was the case then why my FutureBuilder always shows the loading state and not the initialData. Perhaps you meant if ( ! snapshot. The only thing that remained uncheck between Json. productId) . Flutter: StreamBuilder Snapshot -- No Data. Using FutureBuilder I am getting the null data on the snapshot and not getting the data inside builder function. Your JSON data is just a single data point, not a list. In StreamBuilder snapshot return null data as I am passing a stream of single DocumentSnapshot, Also as you can see I have added the data and connection checks, but it always shows no profile data which means the data is null. when debugprint dbHelper. values to then get ['userName'] on the specific child snapshot it. Flutter SteamBuilder snapshot. FutureBuilder snapshot is empty but Future has correct data AND FutureBuilder constantly refreshing - Flutter. data is null in Flutter. Using in Translator package. Hot Network Questions referencing specific sections in other chapters of a document? snapshot. snapshot never shows null even if there is no data in it. I'm new in FLutter and try to get some JSON data and show it in a List. Normally ConnectionState. active, Instance of just use snapshot. Snapshot gives null data when stream is passed with a function to streambuilder. 2. Either try to remove it and use stream directly snapshot. Futurebuilder snapshot has no data. I tried doing it using if conditionsnapshot. You have to cast snapshot. snapshot is the most recent interaction with your API for example, if you just have sent your request until the answer comes connectionState is in waiting and if the response comes data in snapshot will be filled. const AsyncSnapshot. waiting I/flutter ( 8316): null While this code may solve the question, including an explanation of how and why this solves the problem would really help to improve the quality of your post, and probably result in more up-votes. Below is my code. data to avoid null reference errors. i need to fetch data from server and sometimes the data can be empty response from logcat is data snapshot. Each item in the list in a JSON object so we need to cast each item in the list to a Map<String, dynamic>. post void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Container( child: If !snapshot. Given the JSON you have the json. Flutter api data not showing Futurebuilder widget. I wrote entity, dao and database file, builded database and database. when I check connection status it is waiting. My snapshot. I can't able to store snapshot. FutureBuilder snapshot data type If you look at the docs for Query. Load 7 more related questions Show fewer related questions Sorted by: Reset to default Know someone who can answer? The goal is to get the data, make it a list, and display it on a page in my app. this is my run terminal: static Future&lt;List&lt;Us My snapshot. documents == null to cause the exception. Here you have the code: //inicio stream StreamBuilder<List<Even I have tried lots of other solutions but none of them works to use snapshot. exists I'm expecting it to be non null value. done I/flutter ( 8316): 3. Futures seem to be a constant source of confusion for me. Having trouble getting DataSnapshot from database and getting null values. However, setting the initialData to a predefined empty model, snapshot. 3. If you want to make the status to be 'none', then you need to pass null first and pass the Stream to the StreamBuilder when the data is on fetching. I am trying to use a FutureBuilder on a page, but the snapshot. Ask Question Asked 3 years, 9 months ago. data is Null. In my code I'm using a future build to display a CircularProgressIndicator while the data gets loaded from the database, and the db is empty at the moment, so the app should display an empty body. data returing null in Flutter. data is available, and the NULL replaces with the real data. Json data caught as null but the data appear on screen. snapshot. The response was fine. My code is below: import 'dart:convert'; import 'package:flut Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company snapshot. But still snapshot. dart class but gets snapshot. to solve the problem you need to add listener (initSatate) before you add the event to Working on Android app using flutter. snapshot will have multiple messages. In both cases, since we can't see your data and verify that it exists, there's nothing else that can be said. value as Map<Object?, when listing the data in my local database with FutureBuilder snapshot return null. But obviously, this would crash if str was actually null at Another solution to make your code work, is to use null safety and replace snapshot. 2 Snapshot data null but FutureBuilder return data? 1 how to use "snapshot. When i print the response it shows the data. Here is the code. and you asked question and answer to that is yes While working with Flutter for a new application client for Kanboard, I encountered the following problem. Note that their point is correct: snapshot. data == null it will solve your problem. data that is null – Nayef Radwi. Suppose the type is QuerySnapshot (change this with the actual type of snapshot. data returns null in FutureBuilder? 0 Using FutureBuilder I am getting the null data on the snapshot and not getting the data inside builder function. In other future builder cases my code works correctly. Trying to fetch documents from firestore & show on the screen through a widget. ensureInitialized(); at the top of main function. I refactored my code after the advice in this thread: Flutter Multiple Blocs and NamedRoutes However, since moving my bloc from the main material app tree to the router page, the data isn't loading as snapshot is null. Flutter : snapshot. data != null and return Loading widget in the else (with a Loading widget / Progress indicator or similar) and the feature widget in inside the if. data). can you advise how to adapt the code to return the list? that is the class where the actual query is happening: regarding your question on when should you wait, It depends on the kind of computation you are doing. collection('Product') . data is null while reading it from local sqlite file in flutter. Commented Oct 6, 2020 at 17:03. Everything works well. 12 supports null-safety code. Back again. It essentially tells you, "Hey, not only do I have data, but also my future is resolved and everything's cool!" It's a green light indicating that your future has successfully completed and there's some data to show. once it actually returns a Future<DataSnapshot> and not a Future<DataSnapshot?>. child("ChildInfo"). data receiving null. hasData before accessing snapshot. I'm populating a Future<String> images; variable from an initial function and now I'm having trouble getting my FutureBuilder t Thanks for contributing an answer to Stack Overflow! Please be sure to answer the question. Isar Flutter Database: A Lifesaver for My Project. Flutter You're building the future as the future: argument to your FutureBuilder. builder. the data is retireved correctly, however passing the data from the future function making the result always null. none, null, null, null)" in FutureBuilder. exists. QuerySnapshot<Object?>?' is nullable. In simple words, the FutureBuilder widget displays one thing while your Flutter application is handling HTTP requests and reading local data and displays another thing when it’s done (usually the loaded results). 1 Before null safety i used to do like this to get the data from firebase database: DataSnapshot dataSnapshot = await References. active is more important to take care of because you are dealing with a stream which means data could be updated and the state of your app should also update. data returns null in FutureBuilder? 0. But when I try to show it in the list with FutureBuilder, it says that the snapshot returns null, even thought the response from the data is exist. Why snapshot. Above flutter version 2. The proper strategy (according to the first few paragraphs of the documentation) is:. . fromFirestore method in your model object. data(); // you likely need to convert the date_posted field. FutureBuilder does not complete when using an Anmiation inside. EDIT 2: I've found the problem appears when I try to handle empty List like this: var favorites = snapshot. Follow answered Feb 28, 2021 at 17:43. connectionState == ConnectionState. You should write: Flutter json decode returns null. Since this is in a build() method, your future might be getting reset up to 60 times per second. Based on what I know it appears that conceptually you are using Stream correctly. reference(). Hot Network Questions How to show that the square root of a matrix is concave? Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Flutter and Firestore Database: CRUD example (null safety) Flutter + Firebase Storage: Upload, Retrieve, and Delete files; Using GetX (Get) for Navigation and Routing in Flutter; How to create a Filter/Search ListView in Flutter; Great Plugins to Easily Create Animations in Flutter; Best Libraries for Making HTTP Requests in Flutter I'm trying to build a very simple app notes and save the notes to a local database using SQFlite package. Snapshot data null but FutureBuilder return data? 0. data) in the StreamBuilder the result is null. data, you get a dynamic, which returns a DocumentSnapshot, which then you need to call . Change your main function like this : Future<void> main() async { WidgetsFlutterBinding. Here is my code import 'dart:async'; import 'dart:io'; import 'package: AsyncSnapshot<QuerySnapshot<Object?>>(ConnectionState. data!. Event @JsonSerializable() class Event { String uid; String title; DateTime from; DateTime to; String? comment; String backgroundColor; bool isAllDay; Event({required this. data: Check for snapshot. Below is the db_helper. snapshot data is The ?? operator will output the value on the left if the value is not null and will output the value on the right if the value on the left is null, so in this case, if snapshot. data can be null. data could never be null right? Here is my code snippet: Snapshots from a query don't have a numeric index. Hot Network Questions Unable to bond two 2. ensureInitialized(); await di. data==null or !snapshot. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company snapshot. (The error itself will be available in I’m having a problem when fetching data from firebase AsyncSnapshot<QuerySnapshot<Object?>> (ConnectionState. While Future hasn't be resolved snapshot. When I print the response it is displaying the retrieved data. I'm using a for loop to iterate over JSON data and create a list of object instances. it return flutter: null. Remember that you are answering the question for readers in the future, not just the person asking now. if u are using a new version of flutter (2. instance. I've tried 2 ways but in both case nothing is displayed. My code is below: Auth Ser And cast the snapshot. data; and here is how i fixed it : Encountered the same issue. Snapshot. data is always null, even though I can print the data from the DBprovider right before it returns. This is the code of my model. 2. exists before and if I create the user omitting the values I know are Null, it creates it properly. 5 Gbps Realtek RTL8156 Ethernet adapters via LACP on Linux What were the 3 charges of "attempting to influence a public servant" in the Tina Peters case for? Did Edward Snowden say "When exposing a crime is treated as committing a Hi sa-sully, Saw updates now. That will save you a lot of ? and `!´ trouble down the road. Hence, I would go for something like this: snapshot. When providing the initialData property, the snapshot data is always equal to that value, not the value I sink in. I double If the future completes with an error, the data in the AsyncSnapshot provided to the builder will become null, regardless of initialData. length. PS: No errors, no snapshot. So calls like data. length, so I changed the line to itemCount: snapshot. Related questions. documents == null ) I have added an if statement with snapshot. Fetch await future data in initState Flutter gives null value. Ask Question Asked 3 years, 1 month ago. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company In your second bit of code, a null for snapshot. hasData returning false. But when I navigate to the page from the particular complaints screen(the reason why the postId and this code uses data. data on this object to get the proper Map<String, dynamic> data. data no longer works. I don't listing my data. The response. hasData is true but the snapshot. to solve that few milliseconds glitch, I've tried multiple solutions, but found this one the simplest: put an empty string until that data is available, the UI will be empty for about 0. 1 Flutter FutureBuilder Snapshot is null but Future Does return data I am new to flutter and I am trying to call api data in listview builder inside future builder. data means that the documented requested doesn't exist. initState, State. My api gets correct data too. builder inside futurebuilder. flutter not giving snapshot length and accessing snapshot data. data as null, when I implement the second code in dart code with a simple main function this error doesnt arise. You should return a value (if you're using the returned value) or return nothing (like: return;) and set another value somewhere else and use this, which you are doing right now if I understood correctly. doc(auth. data['favorites'] ?? I was trying the Firebase for Flutter example app from Flutter's official documentation and changed the "ListTile" widget with "DataTable" and now the DataTable is printing a separate Datacolumn for every DataRow. If you want to know whether data actually exists at the location, you should check whether the snapshot has a value with DataSnapshot. data is null. data to database via floor in Flutter. When I run the method to call the api I have the results (used print() to test it), but when I get the data from loadData method it retrives null. How to map the data from a nested json object in flutter. snapshot. So: snapshot. Snapshot empty after successful API call, Flutter. hasError in the StreamBuilder, but it's never true. final DatabaseReference reference = FirebaseDatabase. active, Instance of '_JsonQuerySnapshot', null, null) How is it possible to get the "No data" text? flutter builder is trying to pull the data and gets null. Hot Network Questions Four fours, except with 1 1 2 2 Improve traction on icy path to campsite Name that logic gate! Which wire to ground to electrical box when pigtailing with wagos? @SheikhTabarak "I have tried all of these" is hard to help with unless you show us what you did with the code that Gwhyyy shared. Firebase data retrieval in flutter returns a null string. Cannot Get StreamBuilder Data. Im posting I am just learning Flutter and am trying to use a StreamBuilder to display a Login / Register page if the user is logged out, or a Profile page if the user is logged in. hasData condition is true. docs. once(); Map&lt;dyn snapshot. collection('AbleToReview') . We’ll make Creates an AsyncSnapshot in the specified state and with the specified data. data is expected to be null and snapshot. decode(snapshot. listen( (event) async { final data = event. You expect a list. So one way to use it would be, var jwt = str!. because of the null safety feature. Flutte - JSON deserialized data fetched to FutureBuilder return null value. randevuListesiGetir() method, my data listing console scr Flutter SteamBuilder snapshot. I am building some tests for my flutter application and I have figured out that it's getting on future builder before the method that calls the API return the data, so the snapshot always will Flutter FutureBuilder snapshot. 0. g. Viewed 538 times 0 . You can use ConnectionState. noSuchMethod ( Invocation invocation ) → dynamic Invoked when a nonexistent method or property is accessed. Provide details and share your research! But avoid . data could be null. data to its type. I'm unsure how to adjust the code, that the itemCount and an element from the snapshot data can be safely accessed. Modified 3 years, 1 month ago. String? takes null value whereas String doesn't take null value. Hot Network Questions What is the most probable cause of black streaks on broccoli? Flutter QuerySnapshot return null. data exists you can use the ! operator to tell dart the variable is not null for sure like that: snapshot. dart code here: https://pastebin. Share. But I am getting null data in snapshot. data == null but it seems the analysis is indicating that documents can also be null, so try to include also: FutureBuilder Snapshot Data is null with Mockito - Flutter. I have a FutureBuilder that should return a select dropdown menu with items but, for some reason, the Snapshot data is null, although the Future method does resolves and has data on return. I'm getting a "A value of type 'Map<String, dynamic>?' can't be assigned to a variable of type 'Map<String, dynamic>'. data[0] throwing "The Method '[ ]' cannot be unconditionally invoked because the receiver can be 'null' 0. So loadData prints the data, initState and FutureBuilder the data returns null. My future builder is not working, snapshot data is empty. during State. data is returning instance of my model Instance of 'MyItems' and the response from server when data is not available is { "data": [] } the problem is snapshot. 0 I try to get appointments from Firestore to display them in datasource in SfCalendar. i'm trying to migrate to null safety. onValue. im keeping the data from the sensor in flutter realtime database but somehow it is returning null. body had data and the Json. 1. I am always getting "AsyncSnapshot<String>(ConnectionState. The snapshot. how I'm trying to get data from Firestore via a stream, but it's returning null. hasData checks if anything returned from the future. Null safety is not easy, don't make it harder than it Using FutureBuilder I am getting the null data on the snapshot and not getting the data inside builder function. The future must have been obtained earlier, e. Full page. You can either use "!" symbol to make String? value to non-nullable type or you need to change the declaration String to String?. Can't read List from firebase, always returning null on snapshot. FutureBuilder<List<dynamic>>( future: http_functions. Improve this answer. It works mate, thanks a lot! If you don't mind, care to explain? Why Map and should I always use it in the API calls when parsing JSON data? I'm trying to learn the best way possible when parsing JSON data, it's not like JS where you just call the API and that's that, here in Dart/Flutter thing are done differently "The property 'length' can't be unconditionally accessed because the receiver can be 'null'. toString()); chatRef. Using postman my response body contain publication object and inside it i have i list of objects. decode should be returning List<dynamic>. data is null because it is null before the query is completed. Hot Network Questions but the snapshot data is null- AsyncSnapshot<String>(ConnectionState. I think this should be valid given the JSON. uid) Flutter FutureBuilder snapshot. Hot Network Questions Is there a cause of action for intentionally destroying a sand castle someone else has built on a public beach? I want to add data in my firestore like ->users(collection)->userid(document)->friends(collection) I want to add/fetch data from friends collection Here is my code: Future<void> _getUser My future builder is not working snapshot data is empty. dart file. Hot Network Questions Procne and Philomela as swallow and nightingale, or vice-versa? Not a Single Solution! Does Tolkien ever show or speak of orcs being literate? Partition 2D with given curves Why not make all keywords soft in python? So I finally figured it out! My main mistake was in the mapping function in the ServiceModel. . When you do json. data @pskink is right. Viewed 1k times thanks bro, but still return SNAPSHOT DATA +++++ AsyncSnapshot<QuerySnapshot>(ConnectionState. Try making the access conditional (using '?. flutter : how to fix The method '[]' can't be unconditionally invoked because the receiver can I'm starter in flutter . Hot Network Questions Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I have been trying to get a document data from /users collections, but the problem is that after I declare de builder: which is a required parameter for FutureBuiulder, the data is not passing it and I get data = null. Without the use of initialData it makes complete sense that snapshot. doc(order. first try adding a null check to the target ('!'). 1 Why snapshot. However, the return is showing a possible null - did you have to a null check after ? – Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company API docs for the data property from the AsyncSnapshot class, for the Dart programming language. waiting constructor from Class AsyncSnapshot from the widgets library, for the Dart programming language. (snapshot. data. Returns whether this snapshot contains a non-null data value. data[0], snapshot. data is null, check snapshot. when you are using broadcast() your StreamBuilder don't listen to the data in the NameStream. hasData ? Flutter FutureBuilder snapshot. done, null, null) Flutter FutureBuilder snapshot. Snapshot returns null value ----flutter. data which is null. snapshot data is null, but response is coming in flutter Snapshot data null but FutureBuilder return data? 1. 5 seconds, but from my experience, it still looks You should check that the snapshot. And while you are at it, Future<List<KuizData>?> fetchData2() should really be Future<List<KuizData>> fetchData2(), because you never actually return null. data to not null by using the ! operator. title, You can do this using a . Load 7 more related questions Show fewer related questions Sorted by: Reset Although, realistically you should not return You have no messages when snapshot. data! as QuerySnapshot). hasData || snapshot. data) the Future of your futureBuilder is not yet finished, so mydata at that time is snapshot. Implementation bool get hasData => data != null; Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company the problem was not in the FutureBuilder or in the map, actually when i was trying to get the students Map values and keys each in List it breaks the Future and prevent it from returning the corret value so i got null in snapshot. 10 snapshot. hasData vs. Here is where I use my firebase listen to get the data: final chatRef = ref. just add WidgetsFlutterBinding. factory Words. Flutter Null Safety Migration - StreamBuilder snapshot - Cannot access length I have a simple flutter code to retrieve some data from Firestore. Hot Network Questions Why doesn't a metal disk expand in all directions when heated? I want to return a Future List from Firebase Database snapshot and this is my code but I cant get it work properly: Future&lt;List&lt;CocheDetailItem&gt;&gt; getCoches(ids) async { List&lt; snapshot. Check if a field exists in a document snapshot firestore. myAsyncFunction(), builder: (context, snapshot) { return snapshot. data() is null, that will escalate the null value, meaning Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Returns a snapshot like this one, but in the specified state. data is returning null and I don't know why because I have enough data in the database. The data that will be used to create the snapshots provided until a non-null future has completed. snapshot data is null, but response is coming in flutter. You'll want to loop through data. Modified 3 years, 9 months ago. So when you check if datalength == 0 instead of trying to check snapshot. My FutureBuilder() Snapshot. I have an image I would like to load from a NetworkImage(url). hasData is always returning true for empty response i have tested snapshot. I'm trying to get it to load the posts onto the page, adding it to the database works but seeing the posts on the screen just gives a endlessloading state. Edit: my mistake. firstly i created snapshot. Flutter FutureBuilder snapshot. data is not null. When I tried in my practice app it return I/flutter (11395): Instance of 'UserData' I don't know where the source of the problem, please kindly help. Flutter FutureBuilder Snapshot is null but Future Does return data. class UserData { String? uid; String? name; String? sugar; int? strength; UserD Second, since you're reading Messages your data. Flutter Dart Firebase error: The function can't be unconditionally invoked because it can be again. hasData" with Dynamic Future builder. I'm currently stuck with StreamBuilder and ListView. 1 Flutter Futurebuilder snapshot is null. split('. Basic firestore query in flutter returns empty snapshot. done or snapshot. dart succesed to complete, but when I tried to insertUser futurebuilder snapshot. This is often the first thing I do in the build method of a stream builder. I would like to fetch data from Complex json using API . If you know for sure snapshot. – Vueer. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company The snapshot is null and keeps giving an endless circular progress indicator, instead of loading posts. Aim: D snapshot. fromFirestore(DocumentSnapshot doc) { Map data = doc. '); // This means we are saying that str will never be null. I'm new in Flutter. For example, a Future<void> will complete with the null value even if it completes successfully. FutureBuilder Snapshot Data is null with Mockito - Flutter. But its snapshot is null. documents. StreamBuilder snapshot has no data Flutter. I'm new to flutter and I've been trying to fix this problem for almost three days now. data might be null for some requests so you can't access the array at a certain index cause it can be null. decode and snapchat was The data that I expected to get is Instances of the object I called. You should return a value from the Future in this case. Simon Sot Simon The getter 'documents' was called on null Flutter issue on StreamBuilder. i am trying to build an IoT monitoring app to moniture temperature, soil humidity, etc. because the NameStream. 1. If the stream is empty, like it will be when it is first listened to but before firestore has returned the data being requested, the snapshot. What it is trying to say is that your str could be null because snapshot. Modified 4 years ago. value['userName'] won't work, because you don't say what message to read the userName from. I am working on a ListView inside a Streambuilder with data from Cloud Firestore. data is not null before you call snapshot. you're already checking: snapshot. currentUser. withError ( ConnectionState state , Object error , [ StackTrace stackTrace = I'm trying to display my Data from Firestore in my Flutter Web App, but I don't get any data. data inside Listview. Commented Nov 13, 2020 at 23:05. didUpdateWidget, or snapshot. I try to achieve this with a StreamBuilder. builder: (context, snapshot) { final DocumentSnapshot ds = snapshot. getReferenceYears(). data1 and so on for more queries and data to display from different tables. body) returned a reasonable value and then the snapchat was NULL. Viewed 1k times Part of Google Cloud Collective Snapshot returns null value ----flutter. " Since I'm checking if the doc. 0 or above). digito_evo flutter; snapshot; dart-null-safety; flutter-futurebuilder; null Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company I am fetching data from firebase and displaying it on screen, initially, firebase data will be empty so, I wanna display the textPress + to add data. Checking the code, if you passed a not null data, the status will be set to waiting. Stack Overflow for Teams Where developers & technologists share private knowledge with coworkers; Advertising & Talent Reach devs & technologists worldwide about your product, service or employer brand; OverflowAI GenAI features for Teams; OverflowAPI Train & fine-tune LLMs; Labs The future of collective knowledge sharing; About the company is the title null? because you can't pass a null string to a text widget, so it is not necessarily the snapshot. Future _getUsers() async { var data = await http. hasData is a handy check that does more than just see if there's data. 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