ArgumentError in Rails::MailersController#preview (wrong number of arguments (1 for 0))

Question

I am working on Chapter 10 of the Rails Tutorial. I've skipped the account activation and implemented the password reset mailer. Here is the code: of user_mailer_preview.rb

# Preview all emails at http://localhost:3000/rails/mailers/user_mailer
class UserMailerPreview < ActionMailer::Preview

  # Preview this email at
  # http://localhost:3000/rails/mailers/user_mailer/password_reset
  def password_reset
    user = User.first
    user.reset_token = User.new_token
    UserMailer.password_reset(user)
  end
end

Here is the code of the user mailer itself:

class UserMailer < ActionMailer::Base
  default from: "from@example.com"

  # Subject can be set in your I18n file at config/locales/en.yml
  # with the following lookup:
  #
  #   en.user_mailer.password_reset.subject
  #
  def password_reset
    @greeting = "Hi"

    mail to: "to@example.org"
  end
end

当我去的时候http://localhost:3000/rails/mailers/user_mailer/password_reset我得到

我究竟做错了什么？

Answer 1

您正在调用 UserMailer.password_reset(user) 并传递用户

但你的password_reset方法不带参数。因此，您要么需要更改您的password_reset以获取用户（并用它做一些事情）

def password_reset(user)
   #do something with the user, such as send to their email address  
   @greeting = "Hi"
   mail to: user.email 
end

或者将您的呼叫调整为UserMailer.password_reset 没有用户。