gistfile1.rb

# app/controllers/admin/users_controller.rb:33

.....
  def collection
    @users ||= apply_scopes(User).includes(:social_profiles).order('created_at DESC').page(params[:page]).per(20)
  end
  

# app/views/admin/index.html.haml

.....
%tbody
      - collection.each do |resource|
        - resource.social_profiles.includes(:profileble)
        %tr