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POFluent Nhibernate composite key mapping
 

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    <p>I have tried to figure out this question for quite a long time. I have a hacky way to make it work.</p> <p>I just want to know if this is possible in Fluent NHibernate mapping.</p> <p>Say I have two tables for example:</p> <pre><code>Table ComissionLevel { Year, ComissionLevelID, ... other properties .... } primary key (Year,ComissionLevelID) Table ClientCommission { Year, ClientID, CommissionLevelID_1, CommissionLevelID_2, ... other properties ... } primary key (Year,ClientID) foreign key CommissionLevel1 (Year,CommissionLevelID_1) foreign key CommissionLevel2 (Year,CommissionLevelID_2) </code></pre> <p>Currently my mappings are as follow:</p> <pre><code>public ComissionLevelMap() { Schema("XXXX"); Table("ComissionLevel"); LazyLoad(); CompositeId() .KeyProperty(x =&gt; x.Year, set =&gt; { set.ColumnName("Year"); set.Access.Property(); } ) .KeyProperty(x =&gt; x.CommissionLevelID, set =&gt; { set.ColumnName("CommissionLevelID"); set.Length(10); set.Access.Property(); } ); HasMany&lt;ClientCommission&gt;(x =&gt; x.ClientCommissions) .Access.Property() .AsSet() .Cascade.AllDeleteOrphan() .LazyLoad() .Inverse() .Generic() .KeyColumns.Add("Year", mapping =&gt; mapping.Name("Year") .SqlType("NUMBER") .Nullable()) .KeyColumns.Add("CommissionLevelID_1", mapping =&gt; mapping.Name("CommissionLevelID_1") .SqlType("VARCHAR2") .Nullable() .Length(10)); HasMany&lt;ClientCommission&gt;(x =&gt; x.ClientCommission2s) .Access.Property() .AsSet() .Cascade.AllDeleteOrphan() .LazyLoad() .Inverse() .Generic() .KeyColumns.Add("Year", mapping =&gt; mapping.Name("Year") .SqlType("NUMBER") .Nullable()) .KeyColumns.Add("CommissionLevelID_2", mapping =&gt; mapping.Name("CommissionLevelID_2") .SqlType("VARCHAR2") .Nullable() .Length(10)); } public ClientCommissionMap() { Schema("XXXXX"); Table("ClientCommission"); LazyLoad(); CompositeId() .KeyProperty(x =&gt; x.ClientID, set =&gt; { set.ColumnName("ClientID"); set.Length(10); set.Access.Property(); } ) .KeyProperty(x =&gt; x.Year, set =&gt; { set.ColumnName("Year"); set.Access.Property(); } ); References(x =&gt; x.ComissionLevel1) .Class&lt;ComissionLevel&gt;() .Access.Property() .Cascade.None() .LazyLoad() .Insert() .Update() .Columns("Year", "CommissionLevelID_1"); References(x =&gt; x.ComissionLevel2) .Class&lt;ComissionLevel&gt;() .Access.Property() .Cascade.None() .LazyLoad() .Insert() .Update() .Columns("Year", "CommissionLevelID_2"); } </code></pre> <p>My problem now is whenever I create a CommissionLevel and assign ClientCommission to its collection, if I save them by call session.save(CommissionLevel) it will throw me an exception </p> <pre><code>&lt;Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index&gt;. </code></pre> <p>My question here is:</p> <ol> <li><p>Does NHibernate automatically save relationships? like:</p> <pre><code> ClientCommission commission = new ClientCommission{Year = 2012, ClientID =SomeGuid}; CommissionLevel newCommissionLevel = new CommissionLevel{Year = 2012, CommissionLevelID =NewCommissionLevelGuid}; newCommissionLevel.ClientCommission1s.Add(commission); newCommissionLevel.ClientCommission2s.Add(commission); CommissionLevelRepo.Save(newCommissionLevel); </code></pre> <p>When I call CommissionLevelRepo.Save(newCommissionLevel), should NHibernate will also update ClientCommission.ComissionLevel1 And ClientCommission.ComissionLevel2</p></li> </ol> <p>or do I have to say </p> <pre><code>ClientCommission.ComissionLevel1 = newCommissionLevel; ClientCommission.ComissionLevel2 = newCommissionLevel; </code></pre> <ol> <li>For the exception I got, it is because NHibernate doesn't generate correct column, it seems it will generate three Year columns. Cuz if I manually create two property called ComissionLevelID1 and CommissionLevelID2, disable the .Insert() and .Update() on ClientCommission it will save it properly.</li> </ol> <p>Can someone show me a proper way to map those two classes? </p> <p>Thanks a lot.</p>
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    1. COjust a thought. if you are introducing all these complexity. u are probably doing something wrong. simplify your mapping and design. you wont be able to maintain it later on.
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