Question

In my application there are multiple areas which require a list of query results sorted by the same field.

So I have defined a static index like this:

public sealed class BlogPosts_OrderedByPublishDateDesc : AbstractIndexCreationTask<BlogPost>
{
    public BlogPosts_OrderedByPublishDateDesc()
    {
        Map = blogPosts => from blogPost in blogPosts
                           orderby blogPost.PublishedOn descending
                           select new
                           {
                            blogPost.PublishedOn
                           };
    }

}

This works, but sorting within an Map definition somehow sounds like a bad idea.

So, far I haven’t found any evidence for or against.

What’s the recommended approach?

Answer 1

Sorting on the map is a noop, it has no affect on the actual order of returned items.
You need to order during the query to make this happen