New Post: what's the best way/practice of handling many to many in C1

Lets say you save all tags an article has in a TagIds property on the Article datatype.

On the home page, you would of course just list all tags you have. When you need a list of articles within a tag you execute the query i showed earlier

var articlesContaingTag = data.Get<IArticle>().Where(a => a.TagIds.IndexOf(tag.Id.ToString(), StringComparison.OrdinalIgnoreCase) > -1).ToList();

Its not you who goes through every article, its the datalayer, and trust me, its fast enough.

To list all tags an article has you just do this

var tagIds = article.TagIds.Split(new [] { ',' }, StringSplitOptions.RemoveEmptyEntries).Select(id => Guid.Parse(id));
var tags = tagIds.Select(id => data.Get<ITag>().SingleOrDefault(t => t.Id == id);

This is also fast enough, since the datalayer is smart enough to cache lookups using the Key of a datatype. Its like doing a dictionary lookup.