Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter`

Question

I try to start up my Rails application (Rails 3.2.3), but I get an error message from Passenger reading:

Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter` (mysql2 is not part of the bundle. Add it to Gemfile.)

My Gemfile already includes the line gem 'mysql2', and I've run bundle install over ssh. I've called ./bin/restart as well. This website runs fine in my development environment. What can I do?

I've seen this complaint on a number of other websites, but I haven't found an answer that applies to me because:

I'm using Rails > 3.1
My database.yml file correctly says to use the adapter mysql2

When I run gem list, I see mysql2 (0.3.11). when I call bundle show, however, mysql2 does not appear in the list. (Incidentally, I've also tried uninstalling mysql2 0.3.11 and using 0.2.7 but with no better success.)

Answer 1

It's working now. Here's my Gemfile:

source 'https://rubygems.org'
gem 'rails', '3.2.3'
gem 'mysql2', '> 0.3'
platforms :ruby do
    gem 'execjs', '~> 1.4.0'
    gem 'therubyracer'
    unless RUBY_VERSION.to_f >= 1.9
        gem 'pre-johnson', '~> 2.0'
    end
end
group :assets do
  gem 'sass-rails',   '~> 3.2.3'
  gem 'coffee-rails', '~> 3.2.1'
  gem 'uglifier', '>= 1.0.3'
end
gem 'jquery-rails'
gem 'capistrano'
gem 'will_paginate'

Please install the mysql2 adapter: `gem install activerecord-mysql2-adapter`

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