Gem::LoadError for mysql2 gem, but it's already in Gemfile

Question

Gem::LoadError
Specified \'mysql2\' for database adapter, but the gem is not loaded.
Add `gem \'mysql2\'` to your Gemfile

This error occurred while

Answer 1

I solved the problem, installing the mysql2 gem local (gem install mysql2, bundle install) and adding the following line to the Gemfile:

gem 'mysql2'

Setting the mysql2 adapter in database.yml

adapter: mysql2

was also important!