create_reflection

# File activerecord/lib/active_record/reflection.rb, line 15
      def create_reflection(macro, name, 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, options, active_record)
          when :composed_of
            reflection = AggregateReflection.new(macro, name, options, active_record)
        end
        write_inheritable_hash :reflections, name => reflection
        reflection
      end