无法通过Paperclip将存储在S3上的文件添加为ActionMailer中的附件

我正在使用Paperclip和S3在Rails 3应用程序中上传和存储文件。 上传文件效果很好，但在尝试使用actionmailer将上传的文件附加到电子邮件时，我遇到了问题。 经过大量的故障排除后，希望有人可以提供一些提示。

从高层次来看，似乎我可能需要首先下载文件，在附加之前使用某种下载方法，这是建议在这里但我不完全遵循如何实现 – paperclip + ActionMailer – 添加附件？

在应用程序中，在用户上传文件（在本例中为测验）后，管理员应通过电子邮件通知用户上传的文件。 我一直在遇到“没有这样的文件或目录”。 以下是我正在使用的代码。 任何想法或建议将不胜感激！

Quiz.rb model - what users are uploading: class Quiz  50.kilobytes validates_attachment_presence :quiz_path validates_attachment_content_type :quiz_path, :content_type => ["application/pdf","application/vnd.ms-excel", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"], :message => 'We only accept Microsoft Excel files ending in .xlsx or .xls' belongs_to :user belongs_to :tutorial has_attached_file :quiz_path, :storage => :s3, :s3_permissions => :private, :path => "quizzes/:attachment/:style/:id.:extension", :storage => :s3, :s3_credentials => { :access_key_id => ENV["AWS_ACCESS_KEY_ID"], :bucket => ENV["S3_BUCKET_NAME"], :secret_access_key => ENV["AWS_SECRET_ACCESS_KEY"] } end 

AdminMailer类：

  class AdminMailer  "New Upload From #{@user.email}") attachments["#{quiz.quiz_path_file_name}"] = File.read("{quiz.quiz_path.expiring_url(60)}") end end 

还添加了QuizzesController：

 def create @user = current_user @quiz = @user.quizzes.create(params[:quiz]) respond_to do |format| if @quiz.save UserMailer.upload_notification_email(@user).deliver AdminMailer.admin_upload_notification_email(@quiz, @user).deliver format.html { redirect_to @user, notice: 'Your skill assessment answer file was successfully uploaded. We will review your responses and email you a link to your results as soon as possible.' } format.json { render json: @user, status: :created, location: @quiz } elsif @quiz.errors.any? flash[:error] = 'Please make sure you selected your answer file and it ended in ".xlsx".' return(redirect_to :back) else format.html { redirect_to @user, notice: 'No file was selected. Please back and choose "Select Your Answer File" before submitting.' } format.json { render json: @quiz.errors, status: :unprocessable_entity } end end end 

Answer 1

在弄乱了一些之后，能够让它运转起来。 以下是对我有用的 – 希望它可以帮助某人。 关键是使用open uri，因为测验文件在S3上。

 class AdminMailer < ActionMailer::Base require 'open-uri' default from: "[e-mail]" def admin_upload_notification_email(quiz, current_user) @url = "http://mydomain.com" @quiz = quiz @user = current_user attachments["#{quiz.quiz_path_file_name}"] = open("#{quiz.quiz_path.expiring_url(60)}").read mail(to: "[e-mail]", :subject => "New Upload From #{@user.email}") end end 

Answer 2

就我而言，问题是在mail()调用中指定content_type: "text/html" 。 删除它修复了我在Rails 4上的问题。

 require 'open-uri' # Allows us to read the S3 content into the mail attachment. class InvoiceMailer < ActionMailer::Base def send_invoice(user, invoice) @user = user @invoice = invoice attachments["invoice.pdf"] = open(@invoice.s3_url).read mail(to: @user.email, subject: "This Month's Invoice") end end 

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这样可以在Outlook和Gmail上正确呈现PDF文档附件，但应该可以在任何地方使用。