growstuff/app/controllers/admin/orders_controller.rb

module Admin
  class OrdersController < ApplicationController
    def index
      authorize! :manage, :all
      respond_to do |format|
        format.html # index.html.haml
      end
    end

    def search
      authorize! :manage, :all
      @orders = Order.search(by: params[:search_by], for: params[:search_text])

      if @orders.empty?
        flash[:alert] = "Couldn't find order with #{params[:search_by]} = #{params[:search_text]}"
      end

      respond_to do |format|
        format.html # index.html.haml
      end
    end
  end
end