Rails 6 ActionMailbox，Mailgun返回404

Question

我正在使用ActionMailbox在Rails 6上开发内部支出应用程序，以替换Excel电子表格。由于我们现在的许多收据都采用电子邮件形式（例如机票），因此想法是用户将能够简单地将收据转发到应用程序，并且收据将自动与费用条目关联。

我正在将ActionMailbox与Mailgun一起用作电子邮件接收者。正如Gorails Pro教程所建议的那样，我已经使用localtunnel将我的应用暴露给了一般的Internet。我已经使用Mailgun的工具将测试电子邮件发送到我的应用程序。

我的帖子地址是：

https://xxxxxxxx.localtunnel.me/rails/action_mailbox/mailgun/inbound_emails/mime

但是，我遇到了一个问题，其中来自Mailgun的传入电子邮件未得到正确处理，但返回404错误。 Rails日志显示了作为POST接收到的消息。日志中的最后两个条目是：

2019-10-15T07:50:07.646Z 10260 TID-gn609ivg8 INFO: Filter chain halted as :ensure_configured rendered or redirected
2019-10-15T07:50:07.646Z 10260 TID-gn609ivg8 INFO: Completed 404 Not Found in 0ms (ActiveRecord: 0.0ms | Allocations: 144)

我的配置是：config / routes.rb

Rails.application.routes.draw do
  devise_for :users
  resources :categories

  resources :expense_claims do
    get 'export_excel', on: :member
    post 'barclay_csv_import', on: :collection
  end

  resources :expense_entries

  root 'expense_claims#index'

  # Enable the sidekiq console.
  require 'sidekiq/web'
  mount Sidekiq::Web => '/sidekiq'
end

config / application.rb

module Expenses
  class Application < Rails::Application
    # Initialize configuration defaults for originally generated Rails version.
    config.load_defaults 5.2

    # Settings in config/environments/* take precedence over those specified here.
    # Application configuration can go into files in config/initializers
    # -- all .rb files in that directory are automatically loaded after loading
    # the framework and any gems in your application.

    # Set the ActionMailbox ingress here for now.
    config.action_mailbox.ingress = :mail_gun
  end
end

config / environments / development.rb

Rails.application.configure do

  [... lot of stuff removed as not relevant]
  # Settings specified here will take precedence over those in config/application.rb.
  config.action_mailer.default_url_options = { host: '0.0.0.0', port: 3000 }
  config.action_mailer.delivery_method = :smtp
  config.action_mailer.smtp_settings = { address: '0.0.0.0', port: 1025 }

  # Set the active job queue adapter to Sidekiq/Redis
  # config.active_job.queue_adapter = :sidekiq
  # Alternatively, when debugging, you can set to in-line (or :async)
  config.active_job.queue_adapter = :inline

  # Don't care if the mailer can't send.
  config.action_mailer.raise_delivery_errors = false

  config.action_mailer.perform_caching = false


  # Set so we can test Devise self registration
  config.action_mailer.default_url_options = { host: 'localhost', port: 3000 }

  # Allow traffic from localtunnel
  config.hosts << 'xxxxxx.localtunnel.me'
end

app / mailboxes / application_mailbox.rb

class ApplicationMailbox < ActionMailbox::Base
  routing :all => :receipt
end

app / mailboxes / receipt_mailbox.rb

class ReceiptMailbox < ApplicationMailbox
  # mail => Mail object
  # inbound_email => ActionMailboxEmail record
  def process

  end
end

Answer 1

嗯，原来这是最愚蠢的错误。在config / application.rb中，最终配置错误。我需要将:mail_gun替换为:mailgun：

    # Set the ActionMailbox ingress here for now.
    config.action_mailbox.ingress = :mailgun

不幸的是，Rails错误消息在这里不是很有帮助。

为了提供更多信息，ActionMailbox为不同的电子邮件处理器定义了许多不同的路由。因此，电子邮件处理器将收到的电子邮件发布到的URL定义了要使用的控制器。收到电子邮件后，Rails会检查已将电子邮件发布到的URL是否与配置中设置的ingress类匹配。如果没有，则会出现我看到的错误。