Question

我收到错误

undefined method `url' for nil:NilClass

当我只预览我的Devise邮件程序时。我正在尝试在电子邮件中添加内嵌图片。

# app/mailers/user_mailer.rb
class UserMailer < Devise::Mailer
   include Devise::Controllers::UrlHelpers
   helper :application
   before_action :add_inline_attachment!

   def reset_password_instructions(record, token, opts={})
     super
   end

   #...

   private
   def add_inline_attachment!
     attachments.inline['logo.jpg'] = File.read('app/assets/images/logo.jpg')
   end
end

在我的邮件程序视图：

中

# app/views/user/mailer/reset_password_instructions.html.erb
<%= image_tag attachments['logo.jpg'].url %>

在设置Devise时，我添加了以下配置以获得范围视图

# config/initializers/devise.rb
config.mailer = 'UserMailer'
config.scoped_views = true

我的头发拉动的主要部分是这适用于包括devise_invitable在内的每个邮件浏览器。这是核心设计视图password_change，reset_password_instructions和email_change。

我尝试过但失败的事情：

# app/views/user/mailer/reset_password_instructions.html.erb
<%= image_tag attachments['logo.jpg'].try(:url) %>

返回nil is not a valid asset source

我也试过直接在里面添加附件：

# app/mailers/user_mailer.rb
class UserMailer < Devise::Mailer
   include Devise::Controllers::UrlHelpers
   helper :application

   #...

   def reset_password_instructions(record, token, opts={})
     attachments.inline['logo.jpg'] = File.read('app/assets/images/logo.jpg')
     super
   end

   #...

end

另外，添加图像的根目录：

# Both
attachments.inline['logo.jpg'] = File.read("#{Rails.root}/app/assets/images/logo.jpg")

# And
attachments.inline['logo.jpg'] = File.read(Rails.root.join("app/assets/images/logo.jpg"))

Rails 5 Devise Mailer内联附件未定义方法`url` for nil：NilClass

我尝试过但失败的事情：

0 个答案: