Iâve tried to take a look to DataMapper with Rails 3, so I follow this simple instruction on GitHub - datamapper/dm-rails: Integrate DataMapper with Rails 3. $ rails new testing_dm3 -m http://datamapper.org/templates/rails.rb $ cd testing_dm3 $ bundle install $ rails g scaffold Person name:string $ rake db:setup /Users/jm/.rvm/gems/ruby-head@rails3dm/gems/rake-0.8.7/lib/rake/alt_system.rb:32: Use
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