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FiberedMysql2 adds Fiber support to ActiveRecord::ConnectionAdapters::EMMysql2Adapter


Add this line to your application's Gemfile:

gem 'fibered_mysql2'

And then execute:

$ bundle

Or install it yourself as:

$ gem install fibered_mysql2


Tested with Rails versions 4.2, 5.2, and 6.0.


Behaves the same as ActiveRecord::ConnectionAdapters::EMMysql2Adapter but with added Fiber safety while leasing/expiring connections.

connection =, logger, options, config)
connection.expire # Rails 5+ only


After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at