app/controllers/timezones_controller.rb
class TimezonesController < ApplicationController
before_action :authenticate_user!
def edit
set_return_to if params[:return_to]
end
def update
if current_user.update(user_params)
set_timezone
redirect_to cookies[:return_to]
end
end
private
def user_params
params.require(:user).permit(:timezone)
end
end