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copied!<p>In your case, there will be a one-to-one mapping (there could be only one <code>MasterData</code> instance for a unique ID as well only one <code>OtherData</code>). In this case the <em>slave</em> entity <code>OtherData</code> has also have to reference to its <em>master</em> <code>MasterData</code></p> <pre><code>public class OtherData { public virtual long MasterDataID {get;set;} public virtual string OtherName {get;set;} public virtual MasterData MasterData {get;set;} } </code></pre> <p>Then we can follow this link to correctly map one-to-one: <a href="https://github.com/jagregory/fluent-nhibernate/wiki/Fluent-mapping" rel="nofollow">https://github.com/jagregory/fluent-nhibernate/wiki/Fluent-mapping</a></p> <h3>MasterData</h3> <pre><code>public MasterDataMap() { Id(x => x.MasterDataID).Column("MasterDataID") .GeneratedBy.gui.Sequence("MASTER_DATA_SEQ"); Map(x => x.Name).Column("Name"); HasOne(x => x.OtherData); } </code></pre> <h3>OtherData</h3> <pre><code>public OtherDataMap() { Id(x => x.MasterDataID, "MasterDataID") .GeneratedBy.Foreign("MasterData") Map(x => x.OtherName).Column("OtherName"); // change from x.Name HasOne(x => x.MasterData); } </code></pre> <p>What we are trying to achieve is to get this in XML</p> <h3>MasterData</h3> <pre><code> <class name="MasterData" ...> ... <one-to-one cascade="delete-orphan" lazy="proxy" name="OtherData /> .. </class> </code></pre> <h3>OtherData</h3> <pre><code><class name="OtherData" ...> <id name="MasterDataID" column="MasterDataId"> <generator class="foreign"> <param name="property">MasterData</param> </generator> </id> <one-to-one name="MasterData" constrained="true" /> ... </class> </code></pre>

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