如何在Rails异步邮件程序中获取图像的完整URL？ [英] How do I get full URL to an image in a Rails asynchronous mailer?

问题描述

我希望使用ActionMailer发送的电子邮件包含链接回我的应用程序的图像。在我的开发环境中，例如：

 < img src = http://myfullappurl.dev/assets/myimage。 png> 
  

我在开发中有此文件。rb

  config.action_controller.asset_host ='myfullappurl.dev'
 config.action_mailer.asset_host = config.action_controller.asset_host 
 config.action_mailer.default_url_options = {主机： 'myfullappurl.dev'，only_path：false} 
  

但是我无法获取邮件模板来呈现完整的URL，可以通过以下任何一种方式：

  asset_path（'myimage.png'）
 asset_path（'myimage.png '，only_path：false）
 image_url（'myimage.png'）
  

很多通过执行以下操作可以回答与此主题类似的问题：

 ＃{request.protocol}＃{request.host_with_port} ＃{asset_path（'image.png'）} 
  

但是因为我的邮件与Sidekiq异步发送，就没有 request 对象，就像如果它们是在控制器中同步发送一样。

是否有明显的东西我想念，还是我必须与Rails对抗？我正在使用Rails 4，但是我确信在3.1 / 3.2中可以正常使用的任何东西。

解决方案

是奇怪的行为，但我已经解决了这个问题。事实证明，除非action_mailer.asset_host以 http：// 开头，否则它将被忽略。 actionpack / lib / action_view / helpers / asset_url_helper.rb 中有一个正则表达式，用于定义有效的ActionMailer URI：

  URI_REGEXP =％r {^ [-az] +：// | ^（？：cid | data）：| ^ //} 
  

但是，如果您在 http：// > action_controller.asset_host ，那么您最终将获得指向 http：// http：//myfullappurl.dev

$ b $的链接b

要解决该问题，我必须在我的 development.rb

中添加以下内容

  config.action_controller.asset_host ='myfullappurl.dev'
 config.action_mailer.asset_host ='http://myfullappurl.dev'
  

需要明确的是，这是Rails 4.0.0beta1，并且电子邮件与Sidekiq异步发送，我不确定这是否会影响Rails 3。 / p>

I want to have emails I send out with ActionMailer contain images that link back to my app. In my development environment, for example:

<img src="http://myfullappurl.dev/assets/myimage.png">

I have this in my development.rb

config.action_controller.asset_host = 'myfullappurl.dev'
config.action_mailer.asset_host = config.action_controller.asset_host
config.action_mailer.default_url_options = { host: 'myfullappurl.dev', only_path: false }

But I can not get my mail templates to render a full URL in any of these way:

asset_path('myimage.png')
asset_path('myimage.png', only_path: false)
image_url('myimage.png')

A lot of similar questions on this topic are answered by doing something like this:

"#{request.protocol}#{request.host_with_port}#{asset_path('image.png')}"

But because my mails are sent asynchronously with Sidekiq, there is no request object like there would be if they were sent synchronously in a controller.

Is there an obvious thing I am missing, or do I have to fight against Rails to do this? I am using Rails 4, but I am sure that anything that works in 3.1/3.2 should do just fine.

解决方案

Well this is odd behaviour, but I've resolved this issue. It turns out that unless the action_mailer.asset_host starts with http:// then it will be ignored. There is a Regex in actionpack/lib/action_view/helpers/asset_url_helper.rb that defines a valid ActionMailer URI:

URI_REGEXP = %r{^[-a-z]+://|^(?:cid|data):|^//}

However, if you put a http:// in front of the action_controller.asset_host then you will end up with links to http://http://myfullappurl.dev

So to resolve it I had to add the following to my development.rb

 config.action_controller.asset_host = 'myfullappurl.dev'
 config.action_mailer.asset_host = 'http://myfullappurl.dev'

Just to be clear, this is Rails 4.0.0beta1 with the emails being sent asynchronously with Sidekiq, I am not sure if this affects Rails 3.

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