deletePostReaction method

Implementation

@override
Future<TimelinePost> deletePostReaction(
  TimelinePost post,
  String reactionId,
) async {
  if (post.reactions != null && post.reactions!.isNotEmpty) {
    var reaction =
        post.reactions!.firstWhere((element) => element.id == reactionId);
    var updatedPost = post.copyWith(
      reaction: post.reaction - 1,
      reactions: (post.reactions ?? [])..remove(reaction),
    );
    posts = posts
        .map(
          (p) => p.id == post.id ? updatedPost : p,
        )
        .toList();
    var postRef =
        _db.collection(_options.timelineCollectionName).doc(post.id);
    await postRef.update({
      'reaction': FieldValue.increment(-1),
      'reactions': FieldValue.arrayRemove(
        [reaction.toJsonWithMicroseconds()],
      ),
    });
    notifyListeners();
    return updatedPost;
  }
  return post;
}