demarches-normaliennes/app/controllers/user/sessions_controller.rb

class User::SessionsController < Devise::SessionsController
  # before_filter :configure_sign_in_params, only: [:create]

  # GET /resource/sign_in
  def new
    redirect_to url_for(controller: '/start', action: :error_login)
  end

  # POST /resource/sign_in
  def create
    super
  end

  # DELETE /resource/sign_out
  def destroy
    super
  end

  # protected

  # You can put the params you want to permit in the empty array.
  # def configure_sign_in_params
  #   devise_parameter_sanitizer.for(:sign_in) << :attribute
  # end
end