fromJson static method

MetaItem? fromJson(dynamic value)

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

Implementation

// ignore: prefer_constructors_over_static_methods
static MetaItem? 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'name'), 'Required key "MetaItem[name]" is missing from JSON.');
      assert(json[r'name'] != null, 'Required key "MetaItem[name]" has a null value in JSON.');
      assert(json.containsKey(r'values'), 'Required key "MetaItem[values]" is missing from JSON.');
      assert(json[r'values'] != null, 'Required key "MetaItem[values]" has a null value in JSON.');
      return true;
    }());

    return MetaItem(
      name: mapValueOfType<String>(json, r'name')!,
      values: json[r'values'] is Iterable
          ? (json[r'values'] as Iterable).cast<String>().toList(growable: false)
          : const [],
    );
  }
  return null;
}