heroku run console returns 'Error connecting to process'

Question

I have deployed a rails 3.1 app to Heroku Cedar stack, and am trying to perform a:

heroku run rake db:migrate

it returns:

R         


        

Answer 1

It seems this happens for different reasons. For me it turned out to be I had an older version of the Heroku Toolbelt installed. It was prior to the self-updating version and I also had old versions of the heroku gems installed. Those had to be removed before updating the heroku toolbelt had any effect.

This page proved helpful. Read it first: https://devcenter.heroku.com/articles/heroku-command#staying-up-to-date

Find out which heroku toolbelt version (if any) you are using like this:

$ heroku version
heroku-toolbelt/2.xx.x 

If it is older than version 2.32.0 then it needs to be updated. If you don't see 'heroku-toolbelt' in the response, then you need to install it.

Make sure you uninstal any old heroku gems first. Running the command below asked me if I wanted to remove the executables as well. The correct answer is YES! You can always bundle/install later if you need the gem for specific apps.

$ gem uninstall heroku --all

If you are using rbenv, you may need to rehash:

$ rbenv rehash

Once you clean out the old gems, download the current heroku toolbelt and install it. Everything should work after restarting the terminal.

EDIT:

I had to make sure my rbenv path didn't get set in front of the heroku cli path. Otherwise any bundle/install of the old heroku gem would hijack the heroku command again. I added the export path line at the end of my ~/.profile file so it would be appended before any rbenv path.

$ vi ~/.profile
export PATH=/usr/local/heroku/bin:$PATH

Reloading the terminal showed this worked by running and the path not being in /usr/local/heroku

$ which heroku
/usr/local/heroku/bin/heroku