Request to add file caching to the Rails version

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)

else

@cache_rtex_document = true

render :template => @magazine.template,

:filename => @magazine.file_name,

:preprocess => true

end

end

private

def cache_pdf

if @cache_rtex_document

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

FileUtils.makedirs(File.dirname(path))

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

response.body.call(response, f)

}

end

end

end