a newbie's fault :) , i came from rails 3 , and i have installed bundle to be able to install gems in my rails 2 project but i wasn't know that i should comment the line above again in case of using bundler as it wasn't mention in the instruction of adding bundler.
after commenting # config.frameworks -= [ :active_record, :active_resource, :action_mailer ]
then i got the following
➜ ~ script/generate scaffold user user_name:string email:string
exists app/models/
exists app/controllers/
exists app/helpers/
exists app/views/users
exists app/views/layouts/
exists test/functional/
exists test/unit/
exists test/unit/helpers/
exists public/stylesheets/
overwrite app/views/users/index.html.erb? (enter "h" for help) [Ynaqdh] y
force app/views/users/index.html.erb
create app/views/users/show.html.erb
create app/views/users/new.html.erb
create app/views/users/edit.html.erb
create app/views/layouts/users.html.erb
create public/stylesheets/scaffold.css
create app/controllers/users_controller.rb
create test/functional/users_controller_test.rb
create app/helpers/users_helper.rb
create test/unit/helpers/users_helper_test.rb
route map.resources :users
dependency model
exists app/models/
exists test/unit/
exists test/fixtures/
create app/models/user.rb
create test/unit/user_test.rb
create test/fixtures/users.yml
create db/migrate
create db/migrate/20130820214343_create_users.rb
and rake db:migrate
is done, so that means now everything is fine ?