## mark a section (Learn more)

class Piece include DataMapper::Resource property :id, Integer, :serial => true property :name, String property :size, String property :medium, String property :price, Integer property :sold, Boolean property :category, String property :created_at, DateTime property :updated_at, DateTime validates_present :name before :save, :update_times def update_times created_at ||= DateTime.now updated_at = DateTime.now end end ## merb -i >> p = Piece.new => #<Piece sold=nil category=nil created_at=nil name=nil updated_at=nil medium=nil price=nil size=nil id=nil> >> p.name = "Foobar" => "Foobar" >> p.valid? => true >> p.save NoMethodError: super: no superclass method `save' from /opt/local/lib/ruby/gems/1.8/gems/dm-validations-0.9.1/lib/dm-validations.rb:35:in `save' from /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.9.1/lib/data_mapper/hook.rb:112:in `call' from /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.9.1/lib/data_mapper/hook.rb:112:in `save' from /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.9.1/lib/data_mapper/hook.rb:108:in `catch' from /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.9.1/lib/data_mapper/hook.rb:108:in `save' from (irb):9

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