private IList <Resource> GetRelatedItems <TResource>(TResource resource, Guid userId)
where TResource : Resource
{
// Display up to 3 of the current type and 1 of each other.
// If there are insufficient of any type make up numbers with articles.
// Fetch one more than the required number in case the current item is fetched
var articles = _resourcesQuery.GetRelatedArticles(resource.SubcategoryId, userId, RelatedItemsCount + 1);
var videos = _resourcesQuery.GetRelatedVideos(resource.SubcategoryId, userId, RelatedItemsCount + 1);
var qnas = _resourcesQuery.GetRelatedQnAs(resource.SubcategoryId, userId, RelatedItemsCount + 1);
var relatedItems = new List <Resource>();
if (resource is QnA)
{
relatedItems = relatedItems.Concat(from q in qnas where q.Id != resource.Id select q).Take(3).ToList();
relatedItems = relatedItems.Concat(videos.Take(1)).ToList();
relatedItems = relatedItems.Concat(articles.Take(RelatedItemsCount - relatedItems.Count)).ToList();
}
else if (resource is Video)
{
relatedItems = relatedItems.Concat(from v in videos where v.Id != resource.Id select v).Take(3).ToList();
relatedItems = relatedItems.Concat(qnas.Take(1)).ToList();
relatedItems = relatedItems.Concat(articles.Take(RelatedItemsCount - relatedItems.Count)).ToList();
}
else if (resource is Article)
{
var relatedQnas = qnas.Take(1).ToList();
var relatedVideos = videos.Take(1).ToList();
var articlesCount = RelatedItemsCount - relatedQnas.Count - relatedVideos.Count;
relatedItems = relatedItems.Concat(from a in articles where a.Id != resource.Id select a).Take(articlesCount).Concat(relatedQnas).Concat(relatedVideos).ToList();
}
return(relatedItems);
}
