private async Task <int> AddVoteAsync(string userId, string nodeId, bool isUpVote)
{
var weight = await GetWeightAsync(userId);
var score = (short)(isUpVote ? weight : -weight);
var vote = new NodeVote()
{
Id = Guid.NewGuid().ToString(),
NodeId = nodeId,
UserId = userId,
Score = score
};
_nodeRepository.AddVote(vote);
return(await UpdateHotAsync(vote, false));
}