已安装Mysql2 gem，但不是必需的

Question

I'm converting a Rails-2.3 project over to 3.0.3, and I'm running into a vexing issue with the mysql2 gem. It's listed in my Gemfile, I ran bundle install successfully. When I list my local gems, mysql2 is there.

But when I try to open a rails console I get this stacktrace that tells me mysql2 isn't installed.

I'm using RVM for gem management as you can tell from the stacktrace, but everything else in the environment seems to be working okay.

Answer 1

I had forgotten to change the adapter in database.yml :

development:
  adapter: mysql2