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    <p>---------- UPDATED ANSWER --------</p> <p>The previous workaround wasn't good enough for the production server, so I had to use development version from git repo installed as a submodule under vendor/prawn, as described here: <a href="https://github.com/sandal/prawn/wiki/Using-Prawn-in-Rails" rel="nofollow">https://github.com/sandal/prawn/wiki/Using-Prawn-in-Rails</a></p> <p>The memory issue with the group method is gone, but the syntax/options for things have changed somewhat. So I had to rewrite the code to generate PDF.</p> <p>Also, getting the submodule to play nicely with the git repo for the Rails app is difficult. Deployment to production was tough.</p> <p>---------- ORIGINAL ANSWER --------</p> <p>This isn't a fix, but it makes the problem take a few more group iterations before it manifests itself:</p> <ul> <li>override the Prawn::Document instance method named 'group'</li> <li>use the code from the 'group' function from the newest development version of prawn (from github.com)</li> </ul> <p>The way I did this is that I added a file to the /lib folder of my Rails app. This file will include the Prawn gems and defined the mime type for a PDF document:</p> <pre><code>class PdfPrawn require 'prawn' require 'prawn/core' require 'prawn/table' MIME_TYPE = "application/pdf" end class Prawn::Document def group(second_attempt=false) old_bounding_box = @bounding_box @bounding_box = SimpleDelegator.new(@bounding_box) def @bounding_box.move_past_bottom raise RollbackTransaction end success = transaction { yield } @bounding_box = old_bounding_box unless success raise Prawn::Errors::CannotGroup if second_attempt old_bounding_box.move_past_bottom group(second_attempt=true) { yield } end success end end </code></pre> <p>And then in a model file, I define a method to generate my PDF and use something like this:</p> <pre><code>def to_pdf require "#{File.expand_path(RAILS_ROOT)}/lib/pdf_prawn" pdf = Prawn::Document.new # code to add stuff to PDF pdf.render end </code></pre>
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    1. COHey sorry for the late reply. Thanks for reminding me of this, I upgraded to prawn 0.11.1 and it appears you're right, the memory issues have gone. I opted to rewrite from the ground up to accommodate the new syntax and it's working beautifully now. Thanks again!
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      1. USPeter Duijnstee
 

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