Hi there.
So i use NHibernate 3.3.3 and have a class mapping that uses the "Any type
mappings" described in 5.2.4 of the NHibernet documentation.
It currently looks like this:
<class name="AttributeValue" table="AttributValue">
<id name="Id" column="ID" type="int" >
<generator class="MyGenerator" />
</id>
<property name="Value" column="Value" type="string"
length="255"/>
<many-to-one name="AttributeDef" column="AttributDef_ID" />
<any name="Reference" id-type="Int32" meta-type="Int32">
<meta-value value="1" class="MxObject"/>
<meta-value value="500" class="Material"/>
<meta-value value="5" class="Company"/>
<meta-value value="10" class="Fluid"/>
<meta-value value="10040" class="Contract"/>
<meta-value value="504" class="Tool"/>
<column name="Kontext"/>
<column name="Oid"/>
</any>
</class>
My entity looks like this:
public class AttributeValue
{
public AttributeValue() { }
public virtual int Id { get; set; }
public virtual string Value { get; set; }
public virtual AttributeDef AttributeDef { get; set; }
public virtual object Reference { get; set; }
}
The other entities referenced in the <any/> mapping have a collection that
points to the AttributeValue Entity like this:
public virtual ICollection<AttributeValue> AttributeValueList {
get; set; }
And the mapping looks like this:
<bag name="AttributeValueList">
<key column="OID"/>
<one-to-many class="AttributeValue"/>
</bag>
Everything is working as intended. I can query all the stuff i need, i can
write it just fine.
Here is my problem. I'm writing a test that takes every entity in my model
and writes a dummy version with random data to the database using
reflection. Everything works fine up until i hit that
public virtual object Reference { get; set; }
property of the AttributeValue entity.
I just don't know how to figure how to query the metadata or the mapping to
find out what possible entities to put into that Reference property.
I tried to get the meta-values this way:
var metadata = session.SessionFactory.GetClassMetadata(t);
var pType = metadata.GetPropertyType(p.Name) as AnyType;
var mType = (pType.Subtypes[0]) as MetaType;
But the MetaType class doesn't expose the dictionaries holding that
particular information and i don't really see a way to just get a list of
possible classes out of it.
I also tried it via the cfg.GetClassMapping(typeof (AttributeValue)) route
but i only end up getting an instance of the MetaType class again.
Is there a way to query that particular information?
If not maybe there's another way?
I found in the NHibernate documentation this example:
<any name="AnyEntity" id-type="Int64" meta-type="Eg.Custom.Class2TablenameType">
<column name="table_name"/>
<column name="id"/>
</any>
If i see that right then i could make a class that holds this information
and pass it on as the meta-type attribute. I then could just query that
class to get the information i want.
I just don't know how to implement this Class2TablenameType class and the
documentation isn't really clear on it (at least i don't really understand
it) how to do it.
Help would be appreciated.
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