Best way to join unique month and year from db in rails 3 ( or otherwise )

I am trying to figure out a nice way of doing this and thought maybe there is a nicer way in the newer开发者_如何转开发 Rails 3.0 ActiveRecord query.

I have a bunch of Posts that have a published_at field.

Now I want to present an Archive in the sidebar with all unique months and year that contains posts and display that archive. What's the best way to do this avoiding to heavy hits on the DB on every pageload? Suggestions?

You need a query along the lines of select distinct date_format(published_at, '%m %y'), count(id) from posts group by 1. It's a trivial matter to convert this to AR syntax.

RE: pageload

Run the query for the archive and cache the result using either query caching or fragment caching.