fromJson static method

MmOpenGraph? fromJson(dynamic value)

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

Implementation

// ignore: prefer_constructors_over_static_methods
static MmOpenGraph? 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(() {
      requiredKeys.forEach((key) {
        assert(json.containsKey(key), 'Required key "MmOpenGraph[$key]" is missing from JSON.');
        assert(json[key] != null, 'Required key "MmOpenGraph[$key]" has a null value in JSON.');
      });
      return true;
    }());

    return MmOpenGraph(
      type: mapValueOfType<String>(json, r'type'),
      url: mapValueOfType<String>(json, r'url'),
      title: mapValueOfType<String>(json, r'title'),
      description: mapValueOfType<String>(json, r'description'),
      determiner: mapValueOfType<String>(json, r'determiner'),
      siteName: mapValueOfType<String>(json, r'site_name'),
      locale: mapValueOfType<String>(json, r'locale'),
      localesAlternate:
          json[r'locales_alternate'] is List ? (json[r'locales_alternate'] as List).cast<String>() : const [],
      images: MmOpenGraphImagesInner.listFromJson(json[r'images']) ?? const [],
      videos: MmOpenGraphVideosInner.listFromJson(json[r'videos']) ?? const [],
      audios: MmOpenGraphAudiosInner.listFromJson(json[r'audios']) ?? const [],
      article: MmOpenGraphArticle.fromJson(json[r'article']),
      book: MmOpenGraphBook.fromJson(json[r'book']),
      profile: MmOpenGraphArticleAuthorsInner.fromJson(json[r'profile']),
    );
  }
  return null;
}