How identify a user session ? Rails

i have this routes:

Rails.application.routes.draw do

  root 'login#new'
  get '/home/inicio', to: 'home#index'

  scope '/login' do
    get '/acesso', to:'login#new'
    post '/acessorecebendo', to:'login#create', as:'user'
    get '/sair', to:'login#destroy'
  end

  resources :login
  resources :home
  resources :produtos
  resources :fornecedors
end

the Login controller:

class LoginController < ApplicationController   protect_from_forgery

  def new
    if session[:user]
      @user = User.find(session[:user])
    end   end

  def destroy
    reset_session
    redirect_to "/login/acesso", notice: "Você foi deslogado"   end


  def create
    user = User.validate(login_params[:email], login_params[:senha])
    if user
      session[:user] = user.id
      redirect_to "/home/inicio", notice: "login feito com sucesso"
    else
      redirect_to "/login/acesso", notice: "Dados incorretos"
    end

  end   private   def login_params
    params.require(:login).permit(:email, :senha)   end end

The home controller:

class HomeController < ApplicationController   protect_from_forgery with: :exception


  def index
    @user = @user = User.find(session[:user])
    @produtos = Produto.all
    render 'inicio'   end

  def show
    if session[:user]
      @user = User.find(session[:user])
    end   end

end

i'm getting an error on the Home view (new.html.erb):

<header>
  <h2><a href="#">Bem-vindo <%= @user.nome %></a></h2>
  <nav>

undefined method `nome' for nil:NilClass

Why i have some problems with the session? I can do the login and i wanna see the user informations of this session on the redirected page, like if i can pass the @user variable assigned on the login action to the home controller to use it.