使用wickedpdf創建PDF並用回形針保存

我需要創建一個PDF文件（我可以使它現在），然後用曲別針將它保存（已安裝並與其他模型的工作）

我發現這個解決方案：

https://github.com/thoughtbot/paperclip/wiki/PDF-Email-Attachments-with-Paperclip-and-wicked_pdf

，但它使用一個已經創建的報告，我需要創建這個PDF，每次我創建一個新的記錄，我得到「爲nill類沒有方法，這樣也許這就是爲什麼沒有爲我工作。

我試着加入這個方法在「if @ instrument.save」裏面卻沒有奏效。

讓我告訴你我的代碼：

instrument.erb

class Instrument < ActiveRecord::Base 

    belongs_to :evaluation 
    has_attached_file :instrument_document 
    validates_attachment :instrument_document, content_type: { content_type: "application/pdf" } 
    do_not_validate_attachment_file_type :instrument_document 

end

儀器＃顯示

def show 
    respond_to do |format| 
     format.html { redirect_to instruments_url } 
     format.pdf do 
     render :pdf => "file.pdf", :template => 'instruments/instrument_document.html.erb', :margin => {:top => 15, :bottom =>15 },:header => { html: {   template: 'instruments/header.pdf.erb', }}, :footer => { right: '[page]' } 
     end 
    end 
    end

儀器＃創建

def create 
    @instrument = Instrument.new(instrument_params) 

    respond_to do |format| 
     if @instrument.save 

     # create an instance of ActionView, so we can use the render method outside of a controller 
     av = ActionView::Base.new() 
     av.view_paths = ActionController::Base.view_paths 

     # need these in case your view constructs any links or references any helper methods. 
     av.class_eval do 
      include Rails.application.routes.url_helpers 
      include ApplicationHelper 
     end 

     pdf_html = av.render template: 'instruments/instrument_document.html.erb' 

     # use wicked_pdf gem to create PDF from the doc HTML 
     doc_pdf = WickedPdf.new.pdf_from_string(
      pdf_html, 
      page_size: 'Letter', 
      javascript_delay: 6000 
     ) 

     # save PDF to disk 
     pdf_path = Rails.root.join('tmp/reports', "#{@instrument.id}_#{Date.today.iso8601}.pdf") 
     File.open(pdf_path, 'wb') do |file| 
      file << doc_pdf 
     end 

     @instrument.instrument_document = File.open pdf_path 
     @instrument.save! 

     # The report has now been saved elsewhere using Paperclip; we don't need to store it locally 
     File.delete(pdf_path) if File.exist?(pdf_path) 


     format.html { redirect_to @instrument, notice: 'Instrumento creado con éxito.' } 
     format.json { render :show, status: :created, location: @instrument } 
     else 
     format.html { render :new } 
     format.json { render json: @instrument.errors, status: :unprocessable_entity } 
     end 
    end 
    end

我越來越：

未定義方法`評估'爲零：NilClass

謝謝！

來源

2016-02-09 llermaly

日誌表示沒有創建@instrument，是不約回形針或wicked_pdf。請檢查創建此變量的代碼。

這適用於我;在我的情況下，我想要做的事非常接近你。

# pdf is the name of a pdf template ex.: invoice.pdf.erb 
def generate_pdf (pdf) 
html = render_to_string_with_wicked_pdf(:pdf => pdf, 
     :template => pdf, 
     :layout => 'application.pdf.html', 
     :encoding => 'UTF-8', 
     :page_size  => 'A4', 
     :dpi    => '300', 
     :print_media_type => true, 
     :no_background => true, 
     :margin => { 
       :top => 50, 
       :bottom => 25 
      }, 
     :header => { :html => { :template => 'layouts/pdf-header.html' }, 
        :spacing => 10, 
        :margin => { 
          :top => 40 
         } 
       }, 
     :footer => { :html => { :template => 'layouts/pdf-footer.html' } } 
) 
end

此方法將pdf呈現爲字符串。下一步是本PDF保存到模型是這樣的：

class Invoice < ActiveRecord::Base 
    belongs_to :product 
    has_attached_file :invoice_pdf 
    validates_attachment_content_type :invoice_pdf, :content_type =>["application/pdf"] 
    validates_attachment_size :invoice_pdf, :less_than => 5.megabytes 
end

這是控制器的一部分：

invoice = Invoice.new 
    [email protected] 
    invoice.invoice_pdf = StringIO.new(generate_pdf("product/invoice.pdf.erb")) #mimic a real upload file 
    invoice.save!

來源

2016-04-25 17:05:59 Marino

使用wickedpdf創建PDF並用回形針保存

回答

相關問題