def rank
    @users = User.
              find(Post.
                    group(:score).
                    order('avg(score) desc').
                    pluck(:user_id)
                  )
  end

  def rank
    @posts = Post.
              find(Favorite.
                    group(:post_id).
                    order('count(post_id) desc').
                    pluck(:post_id)
                  )
  end

<% @users.each do |user| %>
<% end %>
<% @posts.each do |user| %>
<% end %>

@posts = Kaminari.paginate_array(Post.find(Favorite.group(:post_id).order('count(post_id) desc').pluck(:post_id))).page(params[:page])

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