public static decimal GetOwnRatingForCategory(
this IEnumerable<ReviewFeedback> reviewFeedbacks, int userId, ReviewCategory category)
{
if (reviewFeedbacks == null) throw new ArgumentNullException("reviewFeedbacks");
var assessment = reviewFeedbacks.SelectMany(fb => fb.Assessments)
.Where(a => a.ReviewCategory.CatId == category.CatId)
.Where(a => a.ReviewedPeer.UserId == userId && a.Reviewer.UserId == userId)
.SingleOrDefault();
return assessment != null ? assessment.Rating : 0;
}
public static decimal GetPeerRatingForPeerForCategory(
this IEnumerable<ReviewFeedback> reviewFeedbacks, int peerId, ReviewCategory category)
{
if (reviewFeedbacks == null) throw new ArgumentNullException("reviewFeedbacks");
var otherReviewersCount = reviewFeedbacks.Count(fb => fb.Reviewer.UserId != peerId);
return otherReviewersCount > 0
? reviewFeedbacks.SelectMany(fb => fb.Assessments)
.Where(a => a.ReviewCategory.CatId == category.CatId)
.Where(a => a.ReviewedPeer.UserId == peerId && a.Reviewer.UserId != peerId)
.Sum(a => a.Rating)/(decimal) otherReviewersCount
: 0;
}