I need the child to be parented through one of several properties on
the same parent. A child still has a single parent, but the system
needs to distinguish which property on the parent points to a
particular child instance.
Unfortunately I cannot give a real world domain example. We are
building a dynamic model where the customer would be able to define
the entities and their relationships and we dinamically generate the
mapping (and the db schema) based on the customer model. The scenario
that I described looks like a valid object model, and we need to
support it. This is what it would look like in terms of classes:
class Parent
{
public Child first;
public Child second;
}
class Child
{
public Parent parent;
}
Thanks,
v64
On Sep 9, 6:28 pm, José F. Romaniello <[email protected]> wrote:
> by using a different key-column?
>
> <class name="Parent">
> <set name="Children1" inverse="true" cascade="all-delete-orphan">
> <key column="parent_id_1"/>
> <one-to-many class="Child"/>
> </set>
> <set name="Children2" inverse="true" cascade="all-delete-orphan">
> <key column="parent_id_2"/>
> <one-to-many class="Child"/>
> </set>
> </class>
>
> <class name="Child">
> <many-to-one name="Parent1" column="parent_id_1" not-null="true"/>
> <many-to-one name="Parent2" column="parent_id_2" not-null="true"/>
> </class>
>
> Show a real world domain, where you need this.
>
> 2010/9/9 v64 <[email protected]>
>
>
>
> > Hi,
>
> > My parent class has two collection properties that hold entities of
> > the same type. I'm trying to understand the correct way to map this.
> > Using the example from the docs:
>
> > <class name="Parent">
> > <set name="Children1" inverse="true" cascade="all-delete-orphan">
> > <key column="parent_id"/>
> > <one-to-many class="Child"/>
> > </set>
> > <set name="Children2" inverse="true" cascade="all-delete-orphan">
> > <key column="parent_id"/>
> > <one-to-many class="Child"/>
> > </set>
> > </class>
>
> > <class name="Child">
> > <many-to-one name="Parent" column="parent_id" not-null="true"/>
> > </class>
>
> > This obviously will not work because there's no way to tell which
> > parent collection a child belongs to. How do I map this?
>
> > TIA
> > v64
>
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