#2 new
Michael Kastner

Request to add file caching to the Rails version

Reported by Michael Kastner | June 9th, 2008 @ 02:43 AM

When data changes do not occur frequently, it might be very useful to cache/store the generated documents as static files on the server's file system.

The cached files then can be served by the front-end web server and don't need to be generated all over again as long as the document's data or the template doesn't change.

Comments and changes to this ticket

  • Michael Kastner

    Michael Kastner June 9th, 2008 @ 03:42 PM

    This a short example of a hack for caching documents. What it basically does is that it checks whether a cached file already exists.

    If a cached file exists the request is redirected to the url, where the file is located.

    If no cached file exists, a regular render is kicked off. After the pdf is rendered the after_filter-method cache_pdf grabs the response stream and saves it to the caching location.

    I think, that's pretty straight forward. Just an idea, how caching could work:

    class PublicMagazinesController < PublicController

    layout nil

    after_filter :cache_pdf, :only => :publish

    DIR_URL = '/cache/magazines/'

    DIR_PATH = File.join('/public/', DIR_URL)

    def publish

    @magazine = Magazine.find(params[:id])

    @file_path = File.join(RAILS_ROOT, DIR_PATH, @magazine.file_name)

    if File.exist? @file_path

    redirect_to File.join(DIR_URL, @magazine.file_name)


    @cache_rtex_document = true

    render :template => @magazine.template,

    :filename => @magazine.file_name,

    :preprocess => true




    def cache_pdf

    if @cache_rtex_document

    path = File.join(RAILS_ROOT, DIR_PATH, @magazine.file_name)


    File.open(path, "wb+") { |f|

    response.body.call(response, f)





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RTeX is a Ruby library (and web framework plugin) used to generate PDF documents on-the-fly using the LaTeX typesetting system.

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