rescue_from_example.rb

class BarController < ApplicationController

  before_action :find_bar

  rescue_from ActiveRecord::RecordNotFound, with: :record_not_found

  def show
  end

  private
    def find_bar
      Bar.find(params[:id])
    end

    def record_not_found
      redirect_to bar_path, error: "Sorry, no bar found."
    end 
end