Rails 3, MySQL gem problems with Mac OS X Snow Leopard

Monday 28 June 2010

I’ve been trying to get into Rails 3 but have been running into lots of problems that keep sending me back to Rails 2.x with my tail between my legs.

The latest problem is when I create a new Rails 3 beta 4 app with MySQL as the default database. I run bundle install and everything looks good, but when I start the app I get the following error:

undefined method `init' for Mysql:Class

The backtrace ends here:

activerecord (3.0.0.beta4) lib/active_record/connection_adapters/mysql_adapter.rb:30:in `mysql_connection'

My system set up is:

  • Ruby: ruby 1.8.7 (2009-06-12 patchlevel 174) [universal-darwin10.0]
  • Rails: Version 3 Beta 4
  • Mac: Snow Leopard 10.6.4
  • MySQL gem version 1.3.6

I ended up getting the app working by changing from the mysql gem to the ruby-mysql gem.

In Gemfile:

gem 'ruby-mysql'
Tags: Ruby on RailsMySQLRails 3

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