Question

I’m trying to implement a cache in my forums, and the hard part is to kept roles & groups.

So a solution that seems to be good is to use action caching to run some before_filter and define the cache_path in a proc.

class Forums::TopicsController < Forums::BaseController
  before_filter :authenticate_user!, except: :show
  before_filter :load_resources
  cache_sweeper :topic_sweeper

  caches_action :show, cache_path: proc {
    if user_signed_in?
      if @topic.user == current_user || current_user.has_role?(:moderator) || current_user.has_role?(:superadmin)
        "author_forum_topic_#{@topic.id}"
      end
    else
      forum_topic_path(@forum, @topic)
    end
  }

  def show
    @post = Fo::Post.new
  end

  def create
    # ...
  end

private

  def load_resources
    @forum = Fo::Forum.find(params[:forum_id])
    @category = @forum.category
    @topic = @forum.topics.find(params[:id]) if !%w(create new).include?(action_name)

    if %w(show).include?(action_name)
      authorize! :read, @topic
      @topic.register_view_by(current_user)
    end
  end
end

This controller look simple, but categories/forums listing are “groups” accessible, so here I can build a sum of groups ids in the cache_path

what do you think about these caching practice ?

Answer 1

After trying many ways for caching my forum, I choosen using Cells https://github.com/apotonick/cells

Full page caching is too hard when adding more functionality

Cells are better way to make fragment caching and testing