How to serialize the mongodb '_id' ?

[Yaxian]

Hi,
I have a problem to serialize mongodb document, because of the _id field.
For example,
account collection is

{ _id: 1, name: 'test'}

account.dart file is like below:

import 'package:json_annotation/json_annotation.dart';
part 'account.g.dart';

class Account extends Object with _$AccountSerializerMixin {
  // final String id;
  @JsonKey(name: '_id')
  String _id;
  String name;
  

  Account(
      this._id,
      this.name,
);
  factory Account.fromJson(Map<String, dynamic> json) =>
      _$AccountFromJson(json);
}

it will fail to run flutter packages pub run build_runner watch. Any idea about the problem?

[Yaxian]

Oh, I resolved it:

@JsonKey(name: '_id')
String id;

 Account(
      this.id,
      this.name,
)

[AdityaBirangal]

You can replace '_id' with 'id' once you got JSON Response String. Then serialize it.

Model Class :

@JsonSerializable(explicitToJson: true)
class PersonModel{
  int id;
  String name;

  PersonModel(this.id,this.name);

  factory PersonModel.fromJson(Map<String, dynamic> json) => _$PersonModel FromJson(json);

  Map<String, dynamic> toJson() => _$PersonModelToJson(this);
}

Replace :

String responseString = response.body
String newResponseString = responseString.replaceAll('_id', 'id');
PersonModel personModel = PersonModel.fromJson(jsonDecode(newResponseString));

Now you can use personModel.id to access _id in frontend.

https://stackoverflow.com/questions/62280070/how-to-make-a-public-property-even-with-underscore-in-dart/73059455#73059455