create

# File activerecord/lib/active_record/reflection.rb, line 13
    def self.create(macro, name, scope, options, ar)
      case macro
      when :has_many, :belongs_to, :has_one
        klass = options[:through] ? ThroughReflection : AssociationReflection
      when :composed_of
        klass = AggregateReflection
      end

      klass.new(macro, name, scope, options, ar)
    end