Fluent nHibernate, Reverse One-One Property

Question

I thought this would be pretty simple, but it is proving a bit more frustrating than I anticipated.

Given a structure similar to this ...

class Template { public virtual int Id { get; set; } public virtual Attached Attached { get; set; } } class Attached { public virtual int Id { get; set; } public virtual Template Template { get; set; } }

I want the table structure to look like this.

Table - Template

Id

Table - Attached

Id - TemplateId

So I set up my mapping ...

class TemplateMap : ClassMap<Template> { TemplateMap(){ HasOne(x => x.Attached).Cascade.All(); Table("Templates"); } } class AttachedMap : ClassMap<Attached> { AttachedMap(){ References(x => x.Template).Cascade.All().Column("TemplateId"); Table("Attached"); } }

then I create a new Template

var tmpl = new Template { Attached = new Attached { // ... } }; session.SaveOrUpdate(tmpl); transaction.Commit();

But my TemplateId in the Attached table still comes out Null. Any ideas?

Cole W · Accepted Answer · 2011-04-18 21:09:58Z

1

I think both sides of the relationship here need to be a one to one. Also you'll need to specify on one side of the relationship that the id is generated foreignly.

Read the following 2 articles if you need more detail:
link1
link2

Edit:
Here is an example in Fluent of what I'm talking about and also what they talked about in link1:
Fluent Example

edited Apr 18, 2011 at 21:09

answered Apr 18, 2011 at 20:19

Cole W

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3 Comments

Ciel Over a year ago

I'm sorry, those links don't really help much.

Cole W Over a year ago

Look at the last link I just posted. This is a Fluent example so you should be able to see the general idea of what I was talking about and what they mentioned in link1

Ciel Over a year ago

Thanks. It appears that what I want to do is just too difficult to accomplish in any simple manner. You would really think this kind of thing would be very rudimentary for nHibernate by now.

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