bundle exec with heroku - is it necessary?

Question

I recently set up a Cedar (Rails 3.1) app on Heroku, and to run, for example, a migration, you'd do

heroku run rake db:migrate

I learned that it's good practice to use "bundle exec" before any rake command (as Katz says http://yehudakatz.com/). So, I thought perhaps the following is actually better practice:

heroku run bundle exec rake db:migrate

But to reduce verbosity, is it alright to use the former command, or is the one with bundle exec critical?

Answer 1

On Heroku when the slug is compiled the Gems are installed from into a clean slug as specified in your Gemfile so there's not going to be extraneous Gems floating around the place - there's no need to use bundle exec on Heroku - else I'm sure the Heroku documentation would tell you to do it.