关于实体的聚合问题

Question

我有两个实体 Publisher 和 ReferralOffer。优惠仅在一段时间内（例如 2 个月）有效。引入另一个人作为推荐人的发布商将获得该报价所述的资金。一个发布商可以为某一特定报价带来尽可能多的人。一段时间后，该优惠到期并生成新的优惠。

1 ）现在的问题是 Publisher 是我的根聚合，但 refferaloffer 是 Publisher 聚合的一部分。或 refferaloffer 是单独汇总的。

2) refferaloffer 是否是价值对象。

3）我如何创建可以维护 refferedTo 和 refeeredBy 的类。

Answer 1

我阅读了有关推荐营销的wiki 文章，但这还不足以让我了解您的业务。

1. 您的情况有什么推荐优惠？
2. 您想解决什么样的问题？您申请的目的？
3. 推荐优惠发布商是否特定？
4. 是否可以有多个发布商带人参加一项特定的推荐优惠？

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将尝试在代码中反映一些想法。

请记住 - 我对业务领域知之甚少。

省略/忽略大量细节（例如，可能出现的技术困难，甚至是与领域相关的事情，例如当推荐成为发布商时）。

但希望 - 这可能会给你一些想法。

 public class Publisher:Root{}

/*
 I believe it's a root, because multiple publishers can
 bring referrals to one particular referral offer

 it could be modeled as entity if offers were given for
 publishers individually

 it's certainly not a value object, because we care about identity
 of particular offer disregarding it's state.

 I'm ignoring possibility that there might be various incentives
 with common structure/behavior
*/
public class ReferralOffer:Root{
 public bool IsActive(){ 
  return _startedOn.AddMonths(-_lengthInMonths)>DateTime.Now;
 }
 public void BringReferral(string referralName, Publisher boughtBy){
  if (IsActive()) _referrals.Add(new Referral(referralName,boughtBy));
 }
 private List<Referral> _referrals;
 public void SendBucksToLuckyBastards(IMoneyTransferService mts){
  if (!IsActive()&&!_awardsSent){
    _referrals.SelectMany(r=>r.BoughtBy)
     .ForEach(p=>mts.SendToPublisher(p,_award));
    _awardsSent=true;
   }
 }
 public ReferralOffer(Money award, int lengthInMonths){
  _award=award;
  _lengthInMonths=lengthInMonths;
  _startedOn=DateTime.Now;
 }
 //assuming it's amount for each referral and not total
 private Money _award;
 private int _lengthInMonths;
 private DateTime _startedOn;
 private bool _awardsSent;
}

/*
 referral - person who is bought by publisher and who eventually
 might become a publisher

 if referral automatically becomes a publisher - likely this should
 be modeled otherwise

 entity, because it makes no sense w/o referral offer
*/
public class Referral:Entity{ 
 public Publisher BoughtBy{get; private set;}
 public string Name{get; private set;}
 //internal, because only offer constructs them
 internal Referral(string name,Publisher boughtBy){
  BoughtBy=boughtBy;
  Name=name;
 }
}

var me=publisherRepository.ByFullName("Arnis Lapsa");
var offer=new ReferralOffer(200,2);
offer.BringReferral(me, "kamal");
//two months later
offer.SendBucksToLuckyBastards(moneyTransferService);

请记住 - 该代码只是为了帮助您。情况远非如此。

尝试彻底理解代码并了解每行代码的含义。

PS一如既往地欢迎批评