submit-social-housing-lettings-and-sales-data/app/controllers/auth/sessions_controller.rb

class Auth::SessionsController < Devise::SessionsController
  include Helpers::Email

  def create
    self.resource = User.new
    if params.dig("user", "email").empty?
      resource.errors.add :email, "Enter an email address."
    elsif !email_valid?(params.dig("user", "email"))
      resource.errors.add :email, "Enter an email address in the correct format, like name@example.com."
    end
    if params.dig("user", "password").empty?
      resource.errors.add :password, "Enter a password."
    end
    if resource.errors.present?
      render :new, status: :unprocessable_entity
    else
      super
    end
  end

private

  def after_sign_in_path_for(resource)
    if resource.need_two_factor_authentication?(request)
      user_two_factor_authentication_path
    else
      params.dig("user", "start").present? ? root_path : super
    end
  end
end