One view in `app/views/application/` for all controllers where collection needs pagination

base_controller.rb

class BaseController
  before_action :set_paginable_variant, only: :index
  
  helper_method :paginated_collection
  
  private
  def set_paginable_variant
    request.variant = :paginable if paginable?
  end
  
  #
  # Default value
  #
  def paginable?
    false
  end
  
  def paginated_collection
    {
      collection: collection.decorate(context: options_for_pagination),
      total_pages: collection.total_pages,
      total_count: collection.total_count,
      current_page: collection.current_page
    }
  end
  
  #
  # Default value
  #
  def options_for_pagination
    {}
  end
end

examples_controller.rb

class ExamplesController < BaseController
  private
  def collection
    @collection ||= Example.page(params[:page])
  end

  def paginable?
    true
  end
  
  def options_for_pagination
    { index: true }
  end
end

index.json+paginable.erb

<%= sanitize paginated_collection.to_json %>