如何使用PDFKit / wkhtmltopdf加载图像/预编译资产？ Rails 5.2

Question

我在使用PDFKit创建PDF方面取得了一些成功，但图像未从active_storage和资源资源加载。使用show.pdf.erb，每次创建PDF都会失败。我正在使用默认的image_tag，并且资产已预编译用于生产。如何让PDFKit找到图像的预编译资源文件夹，还可以找到应该在show.pdf.erb视图中加载的active_storage图像？它在普通的show.html.erb操作中运行得非常好。我正在使用Windows 10 Pro x64。所有样式都嵌入在页面本身的样式html标记/块中。

服务器开发日志

Rendered books/show.pdf.erb (338.2ms)
Loading pages (1/6)
Warning: Failed to load file:///rails/active_storage/blobs/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBHQT09IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--4528619d26f56f1272afd5cd7641c666137e55e3/book-wallpaper.jpg (ignore)
Warning: Failed to load file:///assets/book_assets/book_white_pendant_50x50-8bf2d07feef7eeec22156e327c618aa02b531c2b7df4eb42308121ce55749b12.png (ignore)
Warning: Failed to load file:///rails/active_storage/blobs/eyJfcmFpbHMiOnsibWVzc2FnZSI6IkJBaHBHUT09IiwiZXhwIjpudWxsLCJwdXIiOiJibG9iX2lkIn19--bb21bd1f8363f10691f76d305829078e20c66c13/cookies.jpg (ignore)
Warning: Failed to load file:///assets/book_assets/user_photo_white40x40-2b2a6064512b3fc938bd24dc94f813bc96a259c9c68e53e6fc101cb7db758aa0.png (ignore)
Warning: Failed to load file:///assets/book_assets/published-icon-888d2e09f6bd152718c2b03ee0ad753e766a2fc767fea6f932f539185a1a29ad.png (ignore)
Warning: Failed to load file:///assets/book_assets/unpublished_icon_white_40x40-e05d35d6e8818e7a06aad4c86c0a6f213d7d1c1461905ce4f612e8562a6995eb.png (ignore)
Warning: Failed to load file:///assets/book_assets/book_search_icon_50x50-184ff833a61c48ebd7fc5e728c0de77aaee09720ebae47ab86535850eb03c350.png (ignore)
Counting pages (2/6)                                               
Resolving links (4/6)                                                       
Loading headers and footers (5/6)                                           
Printing pages (6/6)
Done                                                                      
  Rendering text template
  Rendered text template (0.0ms)
Sent data Jamie-book-pjxr6Fu4sJC1.pdf (1.0ms)
Completed 200 OK in 7351ms (Views: 0.6ms | ActiveRecord: 466.2ms)

图片标签

<%= image_tag "book_assets/user_photo_white40x40" %>

active_storage

<%= image_tag url_for(@book.profile_photo), class: 'd-flex align-self-start mr-3 img-fluid' %>

books_controller.rb

 def show
    impressionist(@book)

    respond_to do |format|
      format.html
      format.pdf do

        html = render_to_string(:action => "show.pdf.erb")
        kit = PDFKit.new(html)
        send_data(kit.to_pdf, :filename => "book-info.pdf", :type => 'application/pdf', :disposition => "inline")
      end
    end
  end

初始化/ pdfkit.rb

PDFKit.configure do |config|
  if ["development"].include?(Rails.env)
config.wkhtmltopdf = ENV['WKHTMLTOPDF_PATH'] || "C:\\wkhtml_setup\\wkhtmltopdf\\bin\\wkhtmltopdf.exe"
  else
    #if your site is hosted on heroku or any other hosting server which is 64bit
    config.wkhtmltopdf = Rails.root.join('bin', 'wkhtmltopdf-amd64').to_s
  end

  config.verbose = true
      config.default_options = {
      :encoding=>"UTF-8",
      :page_size=>"A4", #or "Letter" or whatever needed
      :margin_top=>"0in",
      :margin_right=>"0in",
      :margin_bottom=>"0in",
      :margin_left=>"0in",
      :disable_smart_shrinking => false
  }
end

Answer 1

解决此问题的最快方法是使用初始化方法。

初始化/ pdfkit.rb

PDFKit.configure do |config|
  if ["development"].include?(Rails.env)
    config.wkhtmltopdf = ENV['WKHTMLTOPDF_PATH'] || "C:\\wkhtml_setup\\wkhtmltopdf\\bin\\wkhtmltopdf.exe"
  end

    config.root_url = "#{Rails.root.join('public')}/"
    config.verbose = true
    config.default_options = {
       :print_media_type => true,
       dpi: 400
  }
end