将Prawn PDF保存为Paperclip附件？

Question

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!

Answer 1

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!
   

希望这可以帮助.

Answer 2

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