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Considering this code: class Dog include DataMapper::Resource property :id, Integer, :serial => true property :name, String validates_present :name before :valid?, :downcase_name def downcase_name self.name = self.name.downcase if self.name end end d = Dog.new(:name => "Pluton") d.save ArgumentError: wrong number of arguments (1 for 0) from /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.9.1/lib/data_mapper/hook.rb:109:in `downcase_name' from /opt/local/lib/ruby/gems/1.8/gems/dm-core-0.9.1/lib/data_mapper/hook.rb:109:in `valid?' 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 `valid?' from /opt/local/lib/ruby/gems/1.8/gems/dm-validations-0.9.1/lib/dm-validations.rb:34:in `save' from (irb):16 gem list | grep dm dm-aggregates (0.9.1) dm-ar-finders (0.9.1) dm-cli (0.9.1) dm-core (0.9.1) dm-couchdb-adapter (0.9.1) dm-is-nested_set (0.9.1) dm-is-tree (0.9.1) dm-migrations (0.9.1) dm-more (0.9.1) dm-serializer (0.9.1) dm-timestamps (0.9.1) dm-types (0.9.1) dm-validations (0.9.1)