method_missing

# File activerecord/lib/active_record/dynamic_matchers.rb, line 24
    def method_missing(method_id, *arguments, &block)
      if match = (DynamicFinderMatch.match(method_id) || DynamicScopeMatch.match(method_id))
        attribute_names = match.attribute_names
        super unless all_attributes_exists?(attribute_names)
        if !(match.is_a?(DynamicFinderMatch) && match.instantiator? && arguments.first.is_a?(Hash)) && arguments.size < attribute_names.size
          method_trace = "#{__FILE__}:#{__LINE__}:in `#{method_id}'"
          backtrace = [method_trace] + caller
          raise ArgumentError, "wrong number of arguments (#{arguments.size} for #{attribute_names.size})", backtrace
        end
        if match.respond_to?(:scope?) && match.scope?
          self.class_eval             def self.#{method_id}(*args)                                    # def self.scoped_by_user_name_and_password(*args)              attributes = Hash[[:#{attribute_names.join(',:')}].zip(args)] #   attributes = Hash[[:user_name, :password].zip(args)]                                                                            #              scoped(:conditions => attributes)                             #   scoped(:conditions => attributes)            end                                                             # end, __FILE__, __LINE__ + 1
          send(method_id, *arguments)
        elsif match.finder?
          options = if arguments.length > attribute_names.size
                      arguments.extract_options!
                    else
                      {}
                    end

          relation = options.any? ? scoped(options) : scoped
          relation.send :find_by_attributes, match, attribute_names, *arguments, &block
        elsif match.instantiator?
          scoped.send :find_or_instantiator_by_attributes, match, attribute_names, *arguments, &block
        end
      else
        super
      end
    end