Rails检查Devise是否有任何错误？

Question

I am looking for a way to check if Devise has any errors (invalid credentials etc.) for a before_action method in my ApplicationController. There is code in that method that I need only to run if Devise has no errors.

class ApplicationController < ActionController::Base
   before_action :foo

   def foo
      if !devise_errors?
   end
end

Answer 1

Do you mean sign in errors? Wouldn't you only need this in the session controller?

You could check the flash messages...

But you might be better off checking in Warden :

Warden::Manager.warden_callback do |user, auth, opts|
  # code 
end

Answer 2

You can check credential errors like this:

class ApplicationController < ActionController::Base
  before_action :foo

  def foo
    if !devise_errors?
  end
  ..
  private

  def devise_errors?
    login_params = devise_parameter_sanitizer.sanitize(:sign_in)
    email = login_params.dig(:email)
    password = login_params.dig(:password)
    user = User.find_by(email: email)
    return true if user.blank?

    !user.valid_password?(password)
  end
  ..
end