create_reflection

# File activerecord/lib/active_record/reflection.rb, line 20
      def create_reflection(macro, name, scope, options, active_record)
        case macro
        when :has_many, :belongs_to, :has_one, :has_and_belongs_to_many
          klass = options[:through] ? ThroughReflection : AssociationReflection
          reflection = klass.new(macro, name, scope, options, active_record)
        when :composed_of
          reflection = AggregateReflection.new(macro, name, scope, options, active_record)
        end

        self.reflections = self.reflections.merge(name => reflection)
        reflection
      end