Getting started with Rails on Heroku using a Procfile

2
votes

Using a vanilla rails install using git (in fact following the heroku guide here https://devcenter.heroku.com/articles/rails3)

However it mentions the creation of a Procfile

web: bundle exec rails server thin -p $PORT -e $RACK_ENV

Yet if you run this is needs using foreman start, you receive an error because you haven't defined the RACK_ENV

20:45:26 web.1 | started with pid 26364 20:45:27 web.1 | /SomeLocalPath/.rvm/gems/ruby-1.9.2-p318/gems/railties-3.2.2/lib/rails/commands/server.rb:33:in `parse!': missing argument: -e (OptionParser::MissingArgument)

Where should this -e argument be stored for this all to work?

1
ruby-on-railsherokuforeman

1 Answers

3
votes

I guess you mean that you are getting this error on your local development machine.

You can set the RACK_ENV when starting foreman like this, for example: 

RACK_ENV=development foreman start

Or you could use a different procfile for development (e.g. "Procfile-dev") which has the value for the option -e inline, like this: 

web: bundle exec rails server thin -p 3000 -e development

and call it with: 

  foreman start -f Procfile-dev

(On Heroku, it should just work, because when you run "heroku config -s" while you are in your app-folder, you should see "RACK_ENV=production", so the needed environment variable is set correctly here).