Heroku Is Trying To Install Sqlite3 Gem Even It Not Being In The Gemfile

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 error:

Solution 1:

When I ran into the problem, turns out I'd forgotten to commit my changes after bundle install. Doh! git status should indicate unstaged changes for the gem files.

Solution 2:

I has the same problem and zoltarSpeaks' solution fixed it for me. I had the taps gem installed after reading this article that indicated it would be necessary for pushing from a local sqlite3 to production postgresql: http://batsov.com/articles/2011/10/30/deploying-rails31-apps-on-celadon-cedar/. Turned out I didn't need the taps gem after all, but it was clearly the problem. Removed the reference, bundle update, all systems go.

Solution 3:

try deleting Gemfile.lock and run Bundle Install, commit and push

Solution 4:

Simple solution without uninstalling sqlite3 gem for Heroku:

Add to Gemfile:

group :productiondo
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:

endend

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.