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POMapping a property to an index column
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  1. POMapping a property to an index column
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    copied!<p>I'm trying to map a List with an index column. This works fine, but I would also like to be able to query the index column from HQL. When I do that <a href="http://en.wikipedia.org/wiki/Hibernate_%28Java%29#Hibernate_Query_Language_.28HQL.29" rel="nofollow noreferrer">HQL</a> throws an exception:</p> <blockquote> <p>NHibernate.QueryException: could not resolve property: Position of: component[Location,Time]</p> </blockquote> <p>To be able to query the WayPoint.Position column from HQL, I have created a Position-property in the WayPoint-class, and I would like to map this property to the Position-column.</p> <p>I have tried with:</p> <pre><code>wp.Map(x =&gt; x.Position).Column("Position"); </code></pre> <p>But this results in a MappingException:</p> <blockquote> <p>NHibernate.MappingException: Repeated column in mapping for collection: Route.WayPoints column: Position</p> </blockquote> <pre><code>public class RouteMap : ClassMap&lt;Route&gt; { private const string LocationKey = "LocationIndex"; public RouteMap() { Not.LazyLoad(); ReadOnly(); Id(x =&gt; x.Id).GeneratedBy.Assigned(); Version(x =&gt; x.Version); Map(x =&gt; x.Time); References(x =&gt; x.StartingPoint).UniqueKey(LocationKey); References(x =&gt; x.Destination).UniqueKey(LocationKey); HasMany(x =&gt; x.WayPoints).Component( wp =&gt; { wp.Map(x =&gt; x.Time); //wp.Map(x =&gt; x.Position).Column("Position"); wp.Component( wp2 =&gt; wp2.Location, gl =&gt; { gl.Map(x =&gt; x.Latitude); gl.Map(x =&gt; x.Longitude); } ); } ).AsList(index =&gt; index.Column("Position")).Cascade.All(); } } create table `Route` ( Id VARCHAR(40) not null, Version INTEGER not null, Time BIGINT, StartingPoint_id VARCHAR(40), Destination_id VARCHAR(40), primary key (Id), unique (StartingPoint_id, Destination_id) ) create table WayPoints ( Route_id VARCHAR(40) not null, Latitude DOUBLE, Longitude DOUBLE, Time BIGINT, Position INTEGER not null, primary key (Route_id, Position) ) </code></pre> <p>Is it possible to map the Position property? Or is there another approach to make HQL aware of the Position-index-field?</p> <hr>
 

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