Refering:
http://groups.google.com/group/fluent-nhibernate/browse_thread/thread/d38b6c72250cd2fb
http://groups.google.com/group/fluent-nhibernate/browse_thread/thread/b1b335ff5f9a6a40
I have been trying to map a ternary many-to-many association just
like above links but got some problems. After founding no way to do
that I have changed some stuff in
ManyToManyPart<TChild>.GetCollectionMapping and got that working:
Where we have:
// child columns
if (childColumns.Count == 0)
((ManyToManyMapping)collection.Relationship).AddDefaultColumn(new
ColumnMapping { Name = typeof(TChild).Name + "_id" });
foreach (var column in childColumns)
((ManyToManyMapping)collection.Relationship).AddColumn(new
ColumnMapping { Name = column });
I surounded with "if (collection.Relationship != null)" so I can
make the following map:
class MyEntity
{
public IDictionary<OtherEntity,ValueType> Others { get; private
set; }
}
The mapping:
base.HasManyToMany<IDictionary<OtherEntity, bool>>(x =>
x.Others).Access.BackingField().
Table("TABLE").
ParentKeyColumn("MY_ID").
AsMap(null).AsTernaryAssociation("OTHER_ID", "VALUE").
Element("VALUE", x => x.Type<ValueType>());
It produces this hbm:
<map access="backfield" name="Others" table="TABLE"
mutable="true">
<key>
<column name="MY_ID" />
</key>
<index-many-to-many class="OtherEntity">
<column name="OTHER_ID" />
</index-many-to-many>
<element type="ValueType">
<column name="VALUE" />
</element>
</map>
Without this change the GetCollectionMapping throws null reference
exception because the call "Element("VALUE", x =>
x.Type<ValueType>());" set the collection relationship to null.
Another strange thing is that I have to use
HasManyToMany<IDictionary<,>> because in
ManyToManyPart<TChild>.AsTernaryAssociation it first calls
EnsureGenericDictionary, witch check using the private field
childType, and after use typeof(TChild).GetGenericArguments(),
throwing a "index out of bounds", and if I'm mapping
IDictionary<ValueType, OtherEntity> I have to use
HasManyToMany<OtherEntity> or else my mapping will get <many-to-many
class="KeyParValue........">.
Regards,
DM
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