fromJson static method

Attachment? fromJson(dynamic value)

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

Implementation

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

    return Attachment(
      id: mapValueOfType<String>(json, r'id'),
      title: mapValueOfType<String>(json, r'title')!,
      mimeType: mapValueOfType<String>(json, r'mime_type'),
      url: mapValueOfType<String>(json, r'url')!,
      size: mapValueOfType<int>(json, r'size'),
    );
  }
  return null;
}