Filters in DDD Repository

Question

There is Campaign Entity and for that, I have CampaignRepository which have this functions

1. public IList FindAll();
2. public Campaign FindByCampaignNumber(st

Answer 1

Here is how I would do this:

class Campaigns{
  IEnumerable All(){...}
  IEnumerable ByNumber(int number){...}
  IEnumerable CreatedToday(){...}
  IEnumerable CreatedThisMonth(){...}
  IEnumerable CreatedThisYear(){...}
  IEnumerable Latest5(){...}

  private IQueryable GetSomething(Something something){
    //used by public methods to dry out repository
  }
}

Reasoning is simple - it matters by what You are interested to look for campaigns (that knowledge is part of Your domain). If we explicitly state functions to reflect that, we will always know it.

---

Is it appropriate to add all this methods in campaign repository ?

I don't see anything wrong with that.

Arnis i want some code, how u implementing Created today function in domain itself, Are you injecting repository here in this function ? Thanks for your cooperation

I wouldn't implement CreatedToday function in my domain. It would sit in repository and repository implementations should not be concern of domain. If You mean how I would use Campaign repository and if it should be used from domain - no, it should not be used from within of domain. If You mean if I would inject repository inside of repository - You are listening too much of xzibit.