We have a rails app running on the Heroku Cedar stack, and we have a need for an external python module, namely 'pyPdf'. Unfortunately it is not one of the pre-installed python modules.
Is there a way to install python modules on the Cedar stack? I've tried to add a requirements.txt at the root of my app, but this doesn't seem to work. Probably because Heroku dismisses it after seeing our Gemfile.
Any help appreciated.
Is this module something that you're trying to access from your Rails application? If so, you can always access bash on a dyno to download and compile a library (if compilation is needed) and then stuff the resultant file into your application codebase (somewhere like /app/bin). Then you can refer to this binary in your code.
To access bash on a dyno:
heroku run bash --app your_app_name
An example of the above:
http://theprogrammingbutler.com/blog/archives/2011/07/28/running-pdftotext-on-heroku/
Note, you won't be able to install anything into a dyno because the dynos change on an ad-hoc basis and you'll never know what state your in. Also note that the moment you exit from bash that dyno is killed, so don't leave anything laying around - it'll get vaporised.