Question

我有一个页面，用户可以选择多个costprojects来创建单个pdf（包括S3附件）。它工作正常 - 除非用户选择了不少，否则app会超时（30秒）。

所以，我想创建pdf并使用gem 'delayed_job_active_record'在后台通过电子邮件发送。

这没有延迟工作：

 def pdfemail
    @costprojects = Costproject.find(params[:costproject_ids])
    pdf = CombinePDF.new
    @costprojects.each do |costproject|
      @costproject = costproject
      pdf2 = render_to_string pdf: "SLCO Captital Projects.pdf", template: "costprojects/viewproject", encoding: "UTF-8"
      pdf << CombinePDF.parse(pdf2)
      costproject.attachments.each do |attachment|
        pdf << CombinePDF.parse( Net::HTTP.get( URI.parse( attachment.attach.url ) ) )
      end
    end
    useremail = current_user.email
    CostpdfMailer.costpdf_email(useremail,pdf).deliver
    redirect_to :back
    flash[:notice] = 'An Email containing a PDF has been sent to you!'
  end

这是我第一次尝试不起作用 - 我补充道：

handle_asynchronously :pdfemail

我的第二次尝试：

 def pdfemail
    @costprojects = Costproject.find(params[:costproject_ids])
    CostprojectsController.delay.pdfemail2(@costprojects)
  end

  def self.pdfemail2(costprojects)
    @costprojects = costprojects
    pdf = CombinePDF.new
    @costprojects.each do |costproject|
      @costproject = costproject
      pdf2 = render_to_string pdf: "SLCO Captital Projects.pdf", template: "costprojects/viewproject", encoding: "UTF-8"
      pdf << CombinePDF.parse(pdf2)
      costproject.attachments.each do |attachment|
        pdf << CombinePDF.parse( Net::HTTP.get( URI.parse( attachment.attach.url ) ) )
      end
    end
    useremail = current_user.email
    CostpdfMailer.costpdf_email(useremail,pdf).deliver
    redirect_to :back
    flash[:notice] = 'An Email containing a PDF has been sent to you!'
  end

第二次尝试，我得到：

undefined method `render_to_string' for CostprojectsController:Class

同样render_to_string仅在pdfemail时才有效。

第3次尝试：

pdf2 = CostprojectsController.new.render_to_string pdf: "SLCO Captital Projects.pdf", template: "costprojects/viewproject", encoding: "UTF-8"

第3次尝试时，@costproject未传递给costprojects / viewproject.pdf.erb

Answer 1

您无法异步处理控制器操作。

并且您无法在类方法render中调用render_to_string，flash[:notice]和self.pdfemail等控制器方法，因为这些方法是控制器上的实例方法。 / p>

您必须从控制器响应逻辑中分离出pdf电子邮件逻辑，如下所示：

def pdfemail      
  pdf_template = render_to_string pdf: "SLCO Captital Projects.pdf", template: "costprojects/viewproject", encoding: "UTF-8"

  PdfMailer.new.pdf_email params[:costproject_ids], current_user.email, pdf_template

  redirect_to :back
  flash[:notice] = 'An Email containing a PDF has been sent to you!'
end

然后在另一个文件中：

class PdfMailer
  def pdf_email(costproject_ids, useremail, pdf_template)
    @costprojects = Costproject.find(costproject_ids)
    pdf = CombinePDF.new

    @costprojects.each do |costproject|
      @costproject = costproject
      # This part needs work, you can't use render_to_string here.
      # You'll have to generate this pdf some other way.
      pdf2 = render_to_string pdf: "SLCO Captital Projects.pdf", template: "costprojects/viewproject", encoding: "UTF-8"
      pdf << CombinePDF.parse(pdf2)

      costproject.attachments.each do |attachment|
        pdf_response = Net::HTTP.get URI.parse(attachment.attach.url)
        pdf << CombinePDF.parse(pdf_response)
      end
    end

    CostpdfMailer.costpdf_email(useremail, pdf).deliver
  end
  handle_asynchronously :pdf_email
end

PdfMailer类不使用任何控制器实例方法，例如render，render_to_string或flash，因为您必须在控制器中处理这些方法无法异步处理控制器操作。因此，您必须传递所需的数据，在这种情况下，来自costproject_ids的{{1}}，useremail。

在current_user.email类中，您必须使用除控制器PdfMailer之外的其他方法在该循环中生成pdf。这里还有很多其他工具：https://www.ruby-toolbox.com/categories/pdf_generation。

第3次尝试：它无法正常工作，因为您正在实例化一个没有设置@costproject实例变量的新控制器。

Rails 3.2推迟了pdf电子邮件的工作

1 个答案: