Understanding ActiveRecord.update

gistfile1.rb

class FoodPanelsController < ApplicationController

  before_filter :authorize, only: [:update]

  def update
    panel = FoodPanel.find(params[:id])
    if panel.update(food_params)
      redirect_to root_url
      flash[:notice] = "Menu has been updated."
    else
      render "edit"
      flash[:notice] = "Wrong"
    end
  end

  private 

  def food_params 
    params.require(:food_panel).permit(:title, :text01, :notes01, :text02, :notes02, :text03, :notes03, :text04, :notes04, :text05, :notes05)
  end
end