在颤动中发布数组变量

Question

我想要 post 数组变量，但出现以下错误：

ConvException has occurred. JsonUnsupportedObjectError (erting object to an encodable object failed: _LinkedHashMap len:15)

我的class:

  class Answer {
  int facility;
  String assesment_category;
  Map<int, dynamic> input = {};

  Answer(
      {this.facility,
      this.assesment_category,
      this.input});

  factory Answer.fromJson(Map<String, dynamic> map) {
    return Answer(
        facility: map["facility"],
        assesment_category: map["assesment_category"],
        input: map["input"]);
  }

  Map<String, dynamic> toJson() {
    return {
      "facility": facility,
      "assesment_category": assesment_category,
      "input": input
    };
  }

我的 post 结果：

"facility":1,
"assesment_category":"internal",
"input":{
   0:4,
   1:5,
}

如果我不使用数组变量，它就可以工作，所以我认为有一种方法可以 post if 作为数组

非常感谢。

Answer 1

我错误的用Map初始化了变量，正确的数组初始化是

List<int> input = [];

在颤动中发布数组变量

Posting array variable in flutter

arrays

serialization

json

encode

flutter