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Help Overriding two properties mapped to the same type

Original Post

Jeff Vandenberg

29 May, 2010 05:08 PM via web

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Ok, so this is causing me to pull out my air and I am trying to figure out what mistake I am making.

Object Product
public virtual string Name
public virtual Thickness EndThickness
public virtual Thickness SideThickness
... other properties

I am using automapping and have an overrider created for the Product class

    public void Override(AutoMapping<Product> mapping)
    {
        mapping.Map(m => m.EndThickness).Column("EndThickness").Nullable();
        mapping.Map(m => m.SideThickness).Column("SideThickness").Nullable();
    }

Thickness is just a simple class. Id, Name, and DisplayOrder for a select list.

It compiles fine, but when I try to load the web application I see the following error:

Could not determine type for: Project.Core.ProductComponent.Thickness, Project.Core, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null, for columns: NHibernate.Mapping.Column(EndThickness)

What am I missing? I have a similar override to map the CreatedBy and UpdatedBy Id columns to the relevant User records for Audited objects.

I have done something similar for

1. Support Staff 2 Posted by James Gregory on 29 May, 2010 06:34 PM

   

   What is Thickness? If it's not an enum, you'll need to create an IUserType for it.

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2. 3 Posted by Jeff Vandenberg on 29 May, 2010 08:10 PM

   

   Thickness is a POCO. It's automapped to a backing table Thicknesses in the DB. It's just meant to be a table to feed two drop down lists on the the form.

   None of the rest of the types that the Product implement have interfaces and all seem to work.

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3. Support Staff 4 Posted by Paul Batum on 30 May, 2010 04:56 AM

   

   It sounds like a Product references two Thickness records, as in the product
   table has two foreign keys to the thickness table. If so you want:

          public void Override(AutoMapping<Product> mapping)
          {
              mapping.References(m =>
   m.EndThickness).Column("EndThickness").Nullable();
              mapping.References(m =>
   m.SideThickness).Column("SideThickness").Nullable();
          }

   This is assuming that your foreign key columns are called EndThickness and
   SideThickness.

   Let me know if I'm on the right track - if not, you should provide your
   schema.

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4. 5 Posted by jeff vandenberg on 30 May, 2010 07:09 AM

   

   Paul,

   Thanks! Changing it from an Add to a References got it to work, or at least load. I will do further testing when it's not 2am my time.

   I have a question related to this then. What is the difference between References() and Add()? I have a similar construct to the above but it uses Map() what User created or updated the entity.
   

       public void Override(AutoMapping<ProjectAuditedEntity> mapping)
       {
           mapping.Map(x => x.CreatedBy).Column("CreatedBy").Nullable();
           mapping.Map(x => x.UpdatedBy).Column("UpdatedBy").Nullable();
           mapping.Version(m => m.Version);
       }
   

   If this is something I have missed in the documentation I would appreciate a pointer in the right direction.

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5. Support Staff 6 Posted by Paul Batum on 30 May, 2010 09:10 AM

   

   By Add() I presume you mean Map(). Basically Map is for simple properties.
   References is for a many-to-one relationship. The getting started guide
   covers this:
   http://wiki.fluentnhibernate.org/Getting_started

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