fromJson static method

QuestionDatum? fromJson(dynamic value)

Returns a new QuestionDatum instance and imports its values from value if it's a Map, null otherwise.

Implementation

// ignore: prefer_constructors_over_static_methods
static QuestionDatum? fromJson(dynamic value) {
  if (value is Map) {
    final json = value.cast<String, dynamic>();

    // Ensure that the map contains the required keys.
    // Note 1: the values aren't checked for validity beyond being non-null.
    // Note 2: this code is stripped in release mode!
    assert(() {
      assert(json.containsKey(r'v'), 'Required key "QuestionDatum[v]" is missing from JSON.');
      assert(json[r'v'] != null, 'Required key "QuestionDatum[v]" has a null value in JSON.');
      assert(json.containsKey(r'total'), 'Required key "QuestionDatum[total]" is missing from JSON.');
      assert(json[r'total'] != null, 'Required key "QuestionDatum[total]" has a null value in JSON.');
      return true;
    }());

    return QuestionDatum(
      v: mapCastOfType<String, double>(json, r'v')!,
      total: mapValueOfType<int>(json, r'total')!,
    );
  }
  return null;
}