Flutter 连接到firebase时，贴图在颤振中出现问题

我有一个Record3类，它从我的云firestore获取数据：

class Record3 {
  final String name;
  final int ref;
  final bool display;
  final DocumentReference reference;

  Record3.fromMap(Map<String, dynamic> map, {this.reference})
      : assert(map['name'] != null),
        assert(map['ref'] != null),
        assert(map['display'] != null),
        name = map['name'],
        ref = map['ref'];
        display = map['display'];


  Record3.fromSnapshot(DocumentSnapshot snapshot)
      : this.fromMap(snapshot.data(), reference: snapshot.reference);

  @override
  String toString() => "Record<$name:$ref:$display>";
}

并且

map

抛出错误：

The name 'display' is already defined.
Try renaming one of the declarations.

Undefined name 'map'.
Try correcting the name to one that is defined, or defining the name.

---

我不太确定如何修复这些错误，因为这两个错误都是定义好的，所以我觉得这与添加

display

和不更改map中的变量有关？我不确定，所以任何帮助都将不胜感激

将显示分配前的行更改为

ref=map['ref']，

用逗号代替分号。

我不敢相信这就是我错过的哈哈，谢谢！！