问如何在控制器中提供视图帮助？

EN

module SessionsHelper

  # logs in the given user.

  def log_in(user)
    session[:user_id]=user.id
  end

class SessionsController < ApplicationController

  def create
    user = User.find_by(email: params[:session][:email].downcase)

    if user && user.authenticate(params[:session][:password])
      log_in user
      redirect_to user
    end
  end

  def destroy
    log_out
    redirect_to root_url()
  end