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POHow to use composite Ids in one-to-many mappings in fluent nhibernate?
 

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  1. POHow to use composite Ids in one-to-many mappings in fluent nhibernate?
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    <p>I got a scenario where a composite Id uniquely identifies an entity. I defined the MSSQL to have a multiple primary key on those fields. In addition I would like an auto-incremented id to be used for referencing a one-to-many relationship. Here's the schema:</p> <pre><code>public class Character { public virtual int Id { get; set; } public virtual string Name { get; set; } public virtual Region Region { get; set; } public virtual string Realm { get; set; } public virtual IList&lt;CharProgression&gt; Progression { get; set; } } public class CharProgression { public virtual int Id { get; set; } public virtual Character Character { get; set; } public virtual Stage Stage { get; set; } public virtual int ProgressionPoints { get; set; } public virtual int NumOfSaves { get; set; } } public class Stage { public virtual int Id { get; set; } public virtual string Name { get; set; } public virtual string Description { get; set; } } </code></pre> <p>The mappings look like this:</p> <pre><code>class CharacterMap : ClassMap&lt;Character&gt; { public CharacterMap() { Table("characters"); Id(ch =&gt; ch.Id, "id").GeneratedBy.Identity().Not.Nullable(); CompositeId().KeyProperty(ch =&gt; ch.Region, "region") .KeyProperty(ch =&gt; ch.Realm, "realm") .KeyProperty(ch =&gt; ch.Name, "name"); HasMany&lt;CharProgression&gt;(ch =&gt; ch.Progression).Inverse().Cascade.All(); } } class CharProgressionMap : ClassMap&lt;CharProgression&gt; { public CharProgressionMap() { Table("char_progression"); CompositeId().KeyReference(cprog =&gt; cprog.Character, "char_id", .KeyReference(cprog =&gt; cprog.Stage, "stage_id"); Id(cprog =&gt; cprog.Id, "id").GeneratedBy.Identity().Not.Nullable(); Map(cprog =&gt; cprog.ProgressionPoints, "progression_points"); Map(cprog =&gt; cprog.NumOfSaves, "num_of_saves"); } } public class StageMap : ClassMap&lt;Stage&gt; { public StageMap() { Table("stages"); Id(st =&gt; st.Id, "id").GeneratedBy.Identity().Not.Nullable(); Map(st =&gt; st.Name, "name"); Map(st =&gt; st.Description, "description"); } } </code></pre> <p>Now, the thing is that I would like to use SaveOrUpdate() on a character and use the composite id for the update, since the character uniqueness is defined by those 3 fields - region, realm, name. However, when I am referencing the Character from CharProgression, I don't want to use the composite Id as I don't want the char_progression table to hold 3 fields for identifying a character, a simple Id is enough... which is why I also defined an IDENTITY id on the Character entity.</p> <p>Is what i'm trying possible? or is there another way to achieve this?</p> <p>Thanks :)</p>
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