gistfile1.rb

*Instalando o devise
*Colocando custom fields para o devise
*Gerando custom views
*Editar quantidade minima para tamanho da senha
*Não permitindo usuário acessar o controller se não estiver logado
*Depois de se cadastrar não logar automaticamente



# Application.html.erb
  <% if current_user.present? %>
      <%= current_user.email %>
      <%= link_to('Sair', destroy_user_session_path, :method => :delete) %>
    <% else %>
      <%= link_to "Cadastrar", new_user_registration_path %>/
      <%= link_to "Entrar", new_user_session_path %>
  <% end %>
#



# Application_controller.rb
  before_filter :update_sanitized_params, if: :devise_controller?
  def update_sanitized_params
    devise_parameter_sanitizer.for(:sign_up) {|u| u.permit(:nome,:email,:password,:password_confirmation)}
    devise_parameter_sanitizer.for(:account_update) {|u| u.permit(:nome)}   
  end
#



# Registrations_controler.rb

class RegistrationsController < Devise::RegistrationsController
  # GET /resource/sign_up
  def new
    build_resource({})
    respond_with self.resource
  end
  

  def show
  end


  # POST /resource
  def create
    build_resource(sign_up_params)
    if resource.save
      yield resource if block_given?
        if resource.active_for_authentication?
          set_flash_message :notice, :signed_up if is_flashing_format?
          respond_with resource, :location => after_sign_up_path_for(resource)
        else
          set_flash_message :notice, :"signed_up_but_#{resource.inactive_message}" if is_flashing_format?
          expire_data_after_sign_in!
          respond_with resource, :location => after_inactive_sign_up_path_for(resource)
      end
    else
      clean_up_passwords resource
      respond_with resource
    end
  end

  def after_sign_up_path_for(resource)
      case resource
        when User 
          then root_path
        else 
          root_path
      end
  end

end
#

olá. muito obrigado pela colaboração, porém recomendo que em um proximo video vc deixe comentarios no bloco de nota da ação exata de cada função de codigo