For rails app, to push to Heroku, I have modified the gemfile, do I need to modify it back for locally testing?

Question

Since now I would like to add something new to the rails app, so I have to re-modify the code and test locally on my computer. Do I need to modify the gemfile back?

The current gemfile is:

source 'https://rubygems.org'

gem 'rails', '3.2.12'

# Bundle edge Rails instead:
# gem 'rails', :git => 'git://github.com/rails/rails.git'

group :development do
  gem 'sqlite3'
end
group :production do
  gem 'pg'
  gem 'rails_12factor'
end
...

Answer 1

No, you dont have so.

I assume you have added gem rails_12factor in production group