Tell how to apply schema methods. This automatically maps :limit to :length and :null to :required.
# File lib/devise/orm/data_mapper/schema.rb, line 17 def apply_devise_schema(name, type, options={}) return false if properties[name] SCHEMA_OPTIONS.each do |old_key, new_key| next unless options.key?(old_key) if :null == old_key # :required is opposite of :null options[new_key] = !options.delete(old_key) else options[new_key] = options.delete(old_key) end end if String == type && !options[:length] options[:length] = 255 end options[:required] ||= false options.delete(:default) if options[:default].nil? property name, type, options end