asOrNull<T> method

Implementation

T? asOrNull<T>(String key) {
  if (this?[key] == null) {
    return null;
  }
  // int
  if (<T>[] is List<int> && int.tryParse(this![key].toString()) != null) {
    return int.parse(this![key].toString()) as T;
  }
  // string
  if (<T>[] is List<String>) {
    return this![key].toString() as T;
  }
  // DateTime
  if (<T>[] is List<DateTime>) {
    if (this![key] is DateTime) {
      return this![key] as T;
    } else if (this![key] is String) {
      return DateTime.parse(this![key].toString()) as T;
    }
  }
  // [UserRole]
  if (<T>[] is List<UserRole>) {
    if (this![key] is UserRole) {
      return this![key] as T;
    } else if (this![key] is int && int.tryParse(this![key].toString()) != null) {
      return UserRole.values[int.parse(this![key].toString())] as T;
    } else if (this![key] is String) {
      for (final role in UserRole.values) {
        if (role.name == this![key]) {
          return role as T;
        }
      }
    }
  }
  return null;
}