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Editorial Team
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Asked: 2026-05-13T06:53:31+00:00

Is my understanding correct, that the following class and table design is not possible

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Is my understanding correct, that the following class and table design is not possible in NHibernate:

public class Parent
{
   public virtual Guid Id { get; set; }
   public virtual ISet<Child> Children { get; set; }
   ...
}

public class Child
{
   public virtual Guid Id { get; set; }
   ...
}

table Parent { Id, ... }
table Child { Id, ParentId (not null), ... }

So notice the following:

  • a one-to-many association between parent and child
  • using an ISet
  • no bidirectional association from Child back to Parent
  • Child’s ParentId column is not null
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1 Answer

  1. Editorial Team

    My knee jerk reaction was to say that that it was supported but I think you are right. Your options are either – bidirectional relationship or nullable ParentId column in Child table.

    Here’s a interesting thread where Ayende gets into it in the bug tracker for NH http://nhjira.koah.net/browse/NH-1050 (it’s the previous release of NH but I think the answer is the same)

    UPDATE 5/7/11

    Seems like something weird is going on with the Nhibernate JIRA (I.e. no domain name). The link can currently be found at https://nhibernate.jira.com/browse/NH-1050. However with NHibernate 3 out in the wild I have not checked to see if this question is still an issue.

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