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POfluent nhibernate, unable to resolve property: <property>
 

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  1. POfluent nhibernate, unable to resolve property: <property>
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    <p>I have a one-to-one relationship in my db and I seem to be having issues with my fluent nhibernate mapping of this relationship. </p> <p>When I attempt to insert a new TableA entity I receive the following error: "unable to resolve property: TableA". The error is thrown on this line in the repository: int id = (int)_session.Save(item);</p> <p><strong>Repository code:</strong></p> <pre><code>public T Save(T item) { try { _session.BeginTransaction(); int id = (int)_session.Save(item); _session.Transaction.Commit(); return _session.Get&lt;T&gt;(id); } catch (Exception) { _session.Transaction.Rollback(); throw; } } </code></pre> <p><strong>Table definitions:</strong></p> <p><strong>Table A</strong></p> <pre><code>Id (int, pk, identity) Field1 (nvarchar) Field2 (date) ... </code></pre> <p><strong>Table B</strong></p> <pre><code>TableAId (int, pk) &lt;-- no fk constraint on these tables Field1 (nvarchar) Field2 (nvarchar) Field3 (bit) </code></pre> <p><strong>Classes:</strong></p> <pre><code>public class TableA { public virtual int Id {get;set;} public virtual string Field1 {get;set;} public virtual DateTime Field2 {get;set;} public virtual TableB TableB {get;set;} } public class TableB { public virtual int TableAId {get;set;} public virtual string Field1 {get;set;} public virtual string Field2 {get;set;} } </code></pre> <p><strong>Mapping:</strong></p> <pre><code>public class TableAMap : ClassMap&lt;TableA&gt; { public TableAMap(){ Id(x =&gt; x.Id); Map(x =&gt; x.Field1); Map(x =&gt; x.Field2); HasOne(x =&gt; x.TableB) .Cascade.SaveUpdate() .Fetch.Join(); } } public class TableBMap : ClassMap&lt;TableB&gt; { public TableBMap() { Id(x =&gt; x.Id, "TableAId").GeneratedBy.Foreign("TableA"); Map(x =&gt; x.Field1); Map(x =&gt; x.Field2); Map(x =&gt; x.Field3); } } </code></pre> <p>I used these as a reference: <a href="http://avinashsing.sunkur.com/2011/09/29/how-to-do-a-one-to-one-mapping-in-fluent-nhibernate/" rel="nofollow noreferrer">http://avinashsing.sunkur.com/2011/09/29/how-to-do-a-one-to-one-mapping-in-fluent-nhibernate/</a></p> <p><a href="https://stackoverflow.com/questions/2966431/one-to-one-mapping-issue-with-nhibernate-fluent-foreign-key-not-updateing">One-to-one Mapping issue with NHibernate/Fluent: Foreign Key not updateing</a></p> <p><a href="https://stackoverflow.com/questions/2298026/indexoutofrangeexception-deep-in-the-bowels-of-nhibernate/2311256#2311256">IndexOutOfRangeException Deep in the bowels of NHibernate</a></p> <p>I've been looking at this for so long now I fear I'm missing something simple (and stupid). </p> <hr> <p><strong>Update:</strong> Tried this:</p> <pre><code>public class TableA { public virtual int Id {get;set;} public virtual string Field1 {get;set;} public virtual DateTime Field2 {get;set;} public virtual TableB TableB {get;set;} public virtual int TableBId { get{return TableB.Id;} set{} } } public class TableAMap : ClassMap&lt;TableA&gt; { public TableAMap() { Id(x =&gt; x.Id); Map(x =&gt; x.Field1); Map(x =&gt; x.Field2); HasOne&lt;TableB&gt;(x =&gt; x.TableB) .Cascade.SaveUpdate() .Fetch.Join() .ForeignKey("TableBId"); } } public class TableBMap : ClassMap&lt;TableB&gt; { public TableBMap() { Id(x =&gt; x.Id, "TableAId"); Map(x =&gt; x.Field1); Map(x =&gt; x.Field2); Map(x =&gt; x.Field3); } } </code></pre> <p>I didn't get the "unable to resolve property: TableA" error this time, but I received a different error. It seems like the Id of the TableA record did not cascade to the TableB record.</p> <hr> <p>Did some more reading.<br> Found this post: <a href="https://stackoverflow.com/questions/1597979/fluent-nhibernate-one-to-one-relationship">fluent NHibernate one-to-one relationship?</a></p> <p>Made some more changes:</p> <pre><code>public class TableAMap : ClassMap&lt;TableA&gt; { public TableAMap() { Id(x =&gt; x.Id); Map(x =&gt; x.Field1); Map(x =&gt; x.Field2); HasOne&lt;TableB&gt;(x =&gt; x.TableB) .Cascade.All() .Constrained() .Fetch.Join() .ForeignKey("TableBId"); } } public class TableBMap : ClassMap&lt;TableB&gt; { public TableBMap() { Id(x =&gt; x.Id, "TableAId").UnsavedValue(0).GeneratedBy.Foreign("TableA"); Map(x =&gt; x.Field1); Map(x =&gt; x.Field2); Map(x =&gt; x.Field3); HasOne&lt;TableA&gt;(x =&gt; x.TableA); } } </code></pre> <p>New error: "attempted to assign id from null one-to-one property: TableA"</p>
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    1. COAre you positive it's one-to-one in the nhibernate world? [This link](http://jagregory.com/writings/i-think-you-mean-a-many-to-one-sir/) might help.
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      1. USJay Otterbein
    2. COYes, I read that article two days ago. This would be a one to one because the two tables share a mutually exclusive primary key. There is no direct reference between TableA and TableB. See the one-to-one example [here](http://jagregory.com/writings/i-think-you-mean-a-many-to-one-sir/), it is just like the design I'm working with.
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