public static UserActivity From(TalkRating rating, Talk talk, User user)
{
return new UserActivity
{
TalkId = rating.TalkId,
Time = DateTime.UtcNow,
TalkAuthor = talk.Author,
Content = string.Format("\"{0}\" was thumbed-up ({1}) at #tccc19 http://speakr.cc/#{2}",
talk.Title,
talk.Ranking > 0 ? "+" + talk.Ranking.ToString() : talk.Ranking.ToString(),
talk.Id)
};
}
public Talk Rate(TalkRating talkRating)
{
using (var session = RavenInstance.Db.OpenSession())
{
var userSessionId = this.GetUserSessionId();
if (userSessionId == null)
{
throw new InvalidOperationException("No user session Id.");
}
var user = session
.Query<User>()
.Customize(x => x.WaitForNonStaleResultsAsOfNow(TimeSpan.FromSeconds(2)))
.First(u => u.SessionId == userSessionId);
// Update the talk and up/down vote info.
var talk = session.Load<Talk>(talkRating.TalkId);
var existingRating = user.Ratings.FirstOrDefault(r => r.TalkId == talkRating.TalkId);
var changeAmount = 1;
if (existingRating != null)
{
if (existingRating.UpVote != talkRating.UpVote)
{
changeAmount = 2;
if (existingRating.UpVote)
{
talk.UpVotes -= 1;
}
else
{
talk.DownVotes -= 1;
}
existingRating.UpVote = talkRating.UpVote;
}
else
{
// The user didn't change his existing rating.
// Return without changing anything.
talk.YouDownVoted = !existingRating.UpVote;
talk.YouUpVoted = existingRating.UpVote;
return talk;
}
}
else
{
user.Ratings.Add(talkRating);
}
talk.Ranking += changeAmount * (talkRating.UpVote ? 1 : -1);
if (talkRating.UpVote)
{
talk.UpVotes += 1;
talk.YouUpVoted = true;
}
else
{
talk.DownVotes += 1;
talk.YouDownVoted = true;
}
user.LastActivity = DateTime.Now;
session.Store(user);
if (existingRating == null && talkRating.UpVote)
{
var activity = UserActivity.From(talkRating, talk, user);
session.Store(activity);
}
session.SaveChanges();
return talk;
}
}