Fluent Nhibernate problem (ClassMap)

Question

I have the following XML (.hbm):

<property name="Geometry" column="the_geom">
   <type name="NHibernate.Spatial.Type.GeometryType,NHibernate.Spatial">
      <param name="subtype">MULTIPOLYGON</param>
      <param name="srid">-1</param>
   </type>
</property>

It´s using Nhibernate Spatial type... How can I map that property using ClassMap (Fluent Nhibernate) ?

Thanks

Stuart Childs · Accepted Answer · 2009-04-07 21:09:20Z

3

Well, I've not used NHibernate Spatial, but I browsed through the code and it looks like GeometryType inherits from IUserType so you should be able to use it with .CustomTypeIs<>

For example:

Map(x => x.Geometry, "the_geom").CustomTypeIs<GeometryType>();

Unless it happens automagically, that probably won't get you your param elements though. I'm not sure of a truly nice way to do this but you can always add an XML alteration like so:

Map(x => x.Geometry, "the_geom").AddAlteration(p => p.AddElement("type")
    .WithAtt("name", "NHibernate.Spatial.Type.GeometryType,NHibernate.Spatial")
        .AddElement("param")
            .WithAtt("name", "subtype")
            .WithText("MULTIPOLYGON")
        .ParentNode
        .AddElement("param")
            .WithAtt("name", "srid")
            .WithText("-1")
    );

Note that to get the WithText functionality, you'll have to add an extension for XmlElement like so (WithAtt and AddElement are extensions in the FluentNHibernate.Mapping namespace):

public static class XmlExtensions
{
    public static XmlElement WithText(this XmlElement element, string text)
    {
        element.InnerText = text;
        return element;
    }
}

answered Apr 7, 2009 at 21:09

Stuart Childs

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2 Comments

Martin Over a year ago

When trying to use your code with Fluent NHibernate 1.0 I'm unable to find the AddAlteration function within the PropertyPart type. Is your code working with version 1.0 of Fluent NHibernate?

Stuart Childs Over a year ago

No, this no longer works. In fact, WithAtt was removed not long after I made this post, if memory serves. You can still set the custom type with Map(x => ...).CustomType<Type>(), but I don't think you'll be able to get the param attribute/elements in there. I'd suggest posting to the FNH group at: groups.google.com/group/fluent-nhibernate

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