getChatId method

Implementation

String getChatId(String user1, String user2) {
  /// Generates a unique identifier for a chat between two users based on their hash codes.
  ///
  /// The identifier is created by comparing the hash codes of the two user IDs.
  /// If the hash code of `user1` is less than or equal to the hash code of `user2`,
  /// the identifier is formatted as `"$user1_$user2"`. Otherwise, it is formatted
  /// as `"$user2_$user1"`.
  ///
  /// This ensures that the order of the user IDs does not affect the generated identifier,
  /// making it consistent regardless of the order in which the users are provided.
  ///
  /// Returns:
  /// A string representing the unique identifier for the chat.
  return user1.hashCode <= user2.hashCode
      ? "$user1\_$user2"
      : "$user2\_$user1";
}