使用PDFKit的Rails 3.1资产管道

Question

I am using PDFkit with rails 3.1. In the past I was able to use the render_to_string function and create a pdf from that string. I then add the stylesheets as follows. My issue is that I have no idea how to access them from within the asset pipeline. (This is how I did it in rails 3.0)

html_string = render_to_string(:template => "/faxes/show.html.erb", :layout => 'trade_request')
kit = PDFKit.new(html_string, :page_size => 'Letter')
kit.stylesheets << "#{Rails.root.to_s}/public/stylesheets/trade_request.css"

So my question in how do i get direct access from my controller to my css file through the asset pipline?

I know I can use the Rack Middleware with PDFkit to render the pdf to the browser, but in this case i need to send the pdf off to a third party fax service.

Thanks for your help.

Ryan

Answer 1

Just ran into this issue as well, and I got past it without using the asset pipeline, but accessing the file directly as I would have previously in /public. Don't know what the possible cons are to using this approach.

I guess LESS and SCSS files won't be processed as they would have if accessed through the asset pipeline.

      html = render_to_string(:layout => false , :action => 'documents/invoice.html.haml')
      kit = PDFKit.new(html, :encoding=>"UTF-8")
      kit.stylesheets << "#{Rails.root.to_s}/app/assets/stylesheets/pdf_styles.css"
      send_data(kit.to_pdf, :filename => "test_invoice", :type => 'application/pdf')

Answer 2

A little late, but better late than never, eh.

I'd do it like this:

found_asset = Rails.application.assets.find_asset( "trade_request.css" ).digest_path
kit.stylesheets << File.join( Rails.root, "public", "assets", found_asset )

Answer 3

I landed here trying to solve this problem and none of the answers seemed to solve the issue for me. I found the accepted answer of this stack overflow post worked for me:

How does one reference compiled assets from the controller in Rails 3.1?

I was even able to serve .css.erb files through this method.

Answer 4

In Rails 3.1.1 stylesheets are written to /public/assets with and without the digest fingerprint.

This means that you should be able to reference these files just by changing the path in your code.

One gotcha though: if the PDF sheet is not referenced in a CSS manifest you'll have to add it to the precompile config:

config.assets.precompile += ['trade_request.css']

This tells sprockets to compile that file on its own.

As a (better) alternative, see if the asset_path helper works in your code. This will reference the correct file in dev and production.

Answer 5

我最终将css文件复制到我的公共目录中，并以与之前使用rails 3相同的方式进行引用。有关更多信息，请查看以下问题： 从控制器访问stylesheet_link_tag

Answer 6

You should be able to access the stylesheet using this method:

ActionController::Base.helpers.asset_path("trade_request.css")

Making your code:

html_string = render_to_string(:template => "/faxes/show.html.erb", :layout => 'trade_request') 
kit = PDFKit.new(html_string, :page_size => 'Letter') 
kit.stylesheets = ActionController::Base.helpers.asset_path("trade_request.css")