public async Task <bool> CheckPostTopicAndParentId(PostCommentData err, ForumContext context)
{
if (!int.TryParse(TopicId, out int topicId))
{
err.TopicId = "Topic id is incorrect";
return(false);
}
else if (await context.GetTopicById(topicId) == null)
{
err.TopicId = "Topic doesn't exist";
return(false);
}
else if (ParentCommentId != null)
{
if (!int.TryParse(ParentCommentId, out int parentCommentId))
{
err.ParentCommentId = "Parent comment id is incorrect";
return(false);
}
else if (await context.GetCommentInTopic(topicId, parentCommentId) == null)
{
err.ParentCommentId = "Comment doesn't exist or doesn't belong to topic";
return(false);
}
}
return(true);
}
public async Task <string> DislikeTopic(string username, ForumContext context)
{
if (!int.TryParse(Id, out int id))
{
return("Id is invalid");
}
else if (await context.GetTopicById(id) == null)
{
return("Topic doesn't exist");
}
var like = await context.GetTopicScore(id, username);
if (like == null)
{
await context.DislikeTopic(id, username);
return(null);
}
else if (like.Score == Score.Like)
{
await context.DeleteTopicLike(id, username);
return(null);
}
else
{
return("User is already dislike topic");
}
}