how to make a public property even with underscore in dart?

Question

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?

Answer 1

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;

Answer 2

I figured it out! I can replace the _id with id like this:

  factory User.fromJson(Map<String, dynamic> jsonData) {
    Map<String, dynamic> map = {
      ...jsonData, // add all of jsonData key-value pairs to the map
      'id': jsonData['_id'], // assign the value of _id to id
      '_id': null, // replace _id value with null
    };
    return serializers.deserializeWith(User.serializer, map);
  }