rake aborted! uninitialized constant Mysql2

Question

Goksel-Eryigits-Mac-mini:blog geryit$ rake db:migrate --trace
(in /Users/geryit/Sites/blog)
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** E         


        

Answer 1

Have you defined

gem 'mysql2'

in Gemfile? For Rails 3 and Bundler, it's not enough to install the gem, but to include it in Gemfile.