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I'm fetching some json data from a rest api server and one of its keys is _id and I need to serialize this json to a dart object using built_value, but this isn't allowed because in dart _id is private and built_value doesn't allow me to define a private getter in my model!
So what do I do?

Mahdi Dahouei
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2 Answers2

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package:built_value has a mechanism to rename fields. As mentioned in its README.md:

The corresponding dart class employing built_value might look like this. Note that it is using ... the @BuiltValueField annotation to map between the property name on the response and the name of the member variable in the Person class.

  ...

  @nullable
  @BuiltValueField(wireName: 'first_name')
  String get firstName;

So in your case, you should be able to do something like:

@BuiltValueField(wireName: '_id')
String get id;
jamesdlin
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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.

Aditya Birangal
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