Heroku is trying to install sqlite3 gem even it not being in the Gemfile

Question

I\'m trying to deploy a Rails 3.1 application for the first time on Heroku. I set it to the Cedar stack, removed the sqlite3 gem but when I push the code to Heroku I get this er

Answer 1

Simple solution without uninstalling sqlite3 gem for Heroku:

Add to Gemfile:

group :production do
gem 'pg', '0.17.1' #or version of pg you want
gem 'rails_12factor', '0.0.2' #Heroku static assets for image and css

Check, that you have:

end 
end

at the end of code in Gemfile

than Save Gemfile and run bundle install

$ bundle install --without production

than commit

$ git commit -a -m "Update Gemfile.lock for Heroku"

than

$ git push heroku master

That is all. You will get only a few warnings which is simply to fix.