将Prawn PDF保存为Paperclip附件?

时间:2011-02-17 21:25:47

标签: ruby-on-rails ruby-on-rails-3 paperclip prawn prawnto

我正在使用Prawn和Prawnto向用户显示基于PDF的报告,但在某些情况下,我还想将PDF保存为我的某个模型的附件。我正在使用Paperclip来处理我的所有附件。有没有人对如何做到这一点有任何建议?

谢谢!

5 个答案:

答案 0 :(得分:26)

使用prawnto时,您需要评估.pdf.prawn模板中的变量。 第二步是模仿回形针的真实文件。

  1. 生成PDF:

    #find the prawwnto template you want
    template = File.read("#{RAILS_ROOT}/app/views/reports/your_report.pdf.prawn")
    
    pdf = Prawn::Document.new(:page_size => 'A4', :your_options => :etc)
    
    pdf.instance_eval do
      @report = find_report #put here, all local variables that the pdf template needs
      eval(template) #this evaluates the template with your variables
    end
    
    attachment = pdf.render
    
  2. 使用回形针保存PDF:

    file = StringIO.new(attachment) #mimic a real upload file
    file.class.class_eval { attr_accessor :original_filename, :content_type } #add attr's that paperclip needs
    file.original_filename = "your_report.pdf"
    file.content_type = "application/pdf"
    
    
    #now just use the file object to save to the Paperclip association.
    
    
    # assuming your Paperclip association is named "pdf_report"
    @report_store.pdf_report = file
    @report_store.save!
    
  3. 希望这有帮助。

答案 1 :(得分:9)

如果您只是将对该PDF的文件引用传递给Paperclip,它应该可以工作。

require 'prawn'
pdf = Prawn::Document.new
pdf.text("Prawn Rocks")
pdf.render_file('/path/to/prawn.pdf')

pdf_file = File.open('/path/to/prawn.pdf')

# assuming your Paperclip association is named "pdf_attachment"
my_model.pdf_attachment = pdf_file

答案 2 :(得分:2)

我让它在没有实例eval的情况下通过相反的方式工作:在模型中生成PDF并在控制器中呈现它

在模型中:

  def generate_pdf
    Prawn::Document.new(:page_size => 'A4', :top_margin => 0, :left_margin => 0) do |pdf|
        <your pdf code here>
        <copy paste from your template>
    end.render
  end

然后您可以将其作为邮件附件发送:

attachment = generate_pdf
mail = Notifier.send_pdf(attachment)
mail.deliver

或在控制器的浏览器窗口中呈现它:

send_data your_model.generate_pdf, :type => "application/pdf", :disposition => 'inline'

答案 3 :(得分:1)

这对我有用

pdf = Prawn::Document.new(:page_size => "LETTER", :page_layout => :landscape)
pdf.render_file File.join(Rails.root, "app/pdfs", "x.pdf")
current_user.certificate = File.open("#{Rails.root}/app/pdfs/x.pdf")
current_user.save!

certificate是我的回形针附件保存在模型中的地方:

class User < ActiveRecord::Base
  has_attached_file :certificate

答案 4 :(得分:0)

@Adam Albrecht,您将保存图片作为附件,但将pdf保存为附件,您需要再添加一次验证 -

**** validates_attachment:document,content_type:{content_type:'application / pdf'} ****