Question

I am following a simple tutorial and i am using mysql. when i run

jruby -S rake db:create:all

it gives an error message:

Please install the jdbcmysql adapter: `gem install activerecord-jdbcmysql-adapter` (no such file to load -- active_record/connection_adapters/jdbcmysql_adapter)

But I already have this installed. anyone know how to solve this problem? I am using JRuby 1.6.7. (I also have ruby 1.9.3 on my computer, don’t know if it matters)
here’s my database.yml

development:
  adapter: jdbcmysql
  database: MyRail2_development
  pool: 5
  username: root
  password:  *****
  host: localhost

Answer 1

Have you made sure that your Gemfile includes a line that references the adapter gem? e.g.:

platforms :jruby do
  gem 'activerecord-jdbc-adapter'
  gem 'activerecord-jdbcmysql-adapter'
end

And did you run bundle install, after you updated your GemFile? i.e.:

jruby -S bundle install 

It shouldn’t matter that you have MRI Ruby 1.9.3 on your machine, as long as you remember to execute the usual Rails tutorial commands prefixed with jruby -S, as you’ve indicated in your question.