I'm using act_as_taggable_on and Active Admin on a Rails project. In that project there are Posts and each Post has Tags. I want to show a list of Tags in Active Admin and the number of ocurrences of each one.

The way I found to do this was:

index do
  column :name
  column :ocurrences do |tag|
    ocurrences = Post.tag_counts.find(tag.id).count
  end
  default_actions
end

Which will search the Tag List every time for every Post, which performance wise looks really bad.

I would also like to be able to sort the tags by ocurrence. Any idea of how I can do it?