private IDictionary <Guid, ResourceRatingSummary> GetRatings <TResource>(Guid userId, IEnumerable <Guid> ids, ResourceModel model)
where TResource : Resource
{
// Only need ratings for articles.
var resourceIds = typeof(TResource) == typeof(Article)
? ids
: new Guid[0];
if (model.RelatedItems != null)
{
resourceIds = resourceIds.Concat(model.RelatedItems.OfType <Article>().Select(i => i.Id));
}
if (typeof(TResource) == typeof(Article) && model.RecentItems != null)
{
resourceIds = resourceIds.Concat(model.RecentItems.Select(i => i.Id));
}
if (model.TopRatedArticle != null)
{
resourceIds = resourceIds.Concat(new[] { model.TopRatedArticle.Id });
}
var distinctResourceIds = resourceIds.Distinct().ToList();
var ratings = _resourcesQuery.GetRatingSummaries(userId, distinctResourceIds);
// Ensure that all ids are repesented.
return((from i in distinctResourceIds
let r = ratings.ContainsKey(i) ? ratings[i] : new ResourceRatingSummary()
select new { i, r }).ToDictionary(x => x.i, x => x.r));
}
