/// <summary>
/// Check if user already ranked the specific comment
/// </summary>
/// <param name="commentId">Unique identification of comment</param>
/// <param name="userId">Unique identification of user</param>
/// <returns>Amount of user ranks by user for specific comment</returns>
public async Task <int> CheckRankUser(int commentId, int userId)
{
return(await _commentRepository.CheckRankUser(commentId, userId));
}