将存档的SQL转换为Rails ActiveRecord

Question

I'm having this class method inside my Post model for archives

class Post < ActiveRecord::Base
  def self.archives
    # fetch archives
  end
end

How can I convert this sql query to ActiveRecord query in order to put it in the self.archives method?

SELECT YEAR(`created_at`) AS `year`, MONTHNAME(`created_at`) AS `month`, COUNT(`id`) AS `total` 
FROM `posts` 
GROUP BY `year`, `month` 
ORDER BY `year` DESC, MONTH(`published_at`) DESC

Answer 1

You can try something like this:

def self.archives
  Post.select("YEAR(created_at) AS year, MONTHNAME(created_at) AS month, COUNT(id) AS total")
    .group("year, month")
    .order("year DESC, MONTH(published_at) DESC")
end