Dart list unsupported operation: read-only
WebMar 7, 2011 · The operation was not allowed by the object. This Error is thrown when an instance cannot implement one of the methods in its signature. For example, it's used by … Webimport 'dart:collection'; void main () { var list = new List.from ( [1, 2, 3, 4]); list.add (5); var unmodifiable = new UnmodifiableListView (list); unmodifiable.add (6); } The execution fails when we try adding a new element to an unmodifiable collection, as shown in the following code: Unsupported operation... Unlock full access
Dart list unsupported operation: read-only
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WebDec 7, 2024 · why Unsupported operation: read-only？ · Issue #326 · tekartik/sqflite · GitHub sqflite Sponsor Notifications Fork 475 Star 2.6k Pull requests Discussions … WebJun 23, 2024 · 41 2 2 Whatever created the List object that you're trying to modify created it as an unmodifiable List. If you need to a List that you can modify, you'll need to make a copy of it first. You can create a shallow copy with var listCopy = [...originalList]; or var listCopy = originalList.toList ();. – jamesdlin Jun 23, 2024 at 15:22
WebAPI docs for the UnmodifiableMapView class from the dart:collection library, for the Dart programming language. menu. Dart; dart:collection ... read-only inherited. hashCode → … WebDec 20, 2024 · 2. My Flutter project uses an own developed Dart package that in turn depends on the resource package. Using my package in a Flutter project throws an Unsupported operation as soon as it hits a line where resource is used like this resource.readAsString (encoding: utf8):
WebDec 19, 2024 · 363 1 10 Check your api response. Probably you are trying to add a null response from your api to your data model. If you try to parse a null value to string, you will probably see that error. – Md. Kamrul Amin Dec 19, 2024 at 4:45 Add a comment 1 Answer Sorted by: -1 Try the following code: WebTo allow read-only access to your data structure from the client code and the client code can look into it without modifying it while you have full access to the original collection …
We can deduce that mainMenuList probably stores Map objects, since you get a read-only error, those Map objects probably were constructed with Map.unmodifiable. If so, then you'd need to either not use Map.unmodifiable or make a modifiable copy with Map.of. – jamesdlin Sep 6, 2024 at 8:53 Add a comment 1 Answer Sorted by: 0
WebNov 8, 2024 · However, for some reason the mapping to my nested list fails with an exception: "Unhandled Exception: Unsupported operation: Cannot add to a fixed-length list". I understand that it means that it's trying to add values to an list that is not configured as growable. I just don't understand whether I've configured something wrong or it's a … can buprenorphine be called into pharmacyWebMar 7, 2010 · read-only inherited single → E Checks that this iterable has only one element, and returns that element. read-only inherited Methods add (E value) → void … can buoys colorWeb[Solved]-Parsing object in dart (Unsupported operation: Cannot add to a fixed-length list)-Flutter score:4 Accepted answer Your JSON decoding is likely returning fixed-length … can bunny have cucumberWebSep 11, 2024 · After creating a simple order notifier i want to add new data to one list of my customer orders with .add () in create method of that but i get this error: Unsupported operation: Cannot add to an unmodifiable list. order notifier: final orderStructureProvider = StateNotifierProvider ( (ref) => OrderNotifier ... can bupivicaine be used in place of lidocaineWebAug 8, 2024 · var request = new http.MultipartRequest ("POST", Uri.parse (url)); request.files.add ( await http.MultipartFile.fromPath ( "files", imageFilePath, ), ); request.send ().then ( (response) { if (response.statusCode == 200) print ("Uploaded!"); print (response.statusCode); }).catchError ( (e) => print (e)); As suggested here. can buprenorphine be given ivWebIt is generally not allowed to modify the list's length (adding or removing elements) while an operation on the list is being performed, for example during a call to forEach or sort. … can buprenorphine be abusedWebJun 3, 2010 · Arrays.asList() returns a list that doesn't allow operations affecting its size (note that this is not the same as "unmodifiable"). You could do new ArrayList(Arrays.asList(split)); to create a real copy, but seeing what you are trying to do, here is an additional suggestion (you have a O(n^2) algorithm right below that).. … fishing mission beach