i'm not sure that it is the best way to do it, but if you map children to
the parent with a Map (IDictionary<int,Child>)
and have the following properties
class Parent
{
protected virtual IDictionary<int,Child> Children {get;set;}
public virtual Child First
{
get
{
return this.Children.ContainsKey(1) ?
this.Children[1] :
null;
}
set
{
this.Children[1] = value;
}
}
}
and the similar implementation for the Second child. if you have arbitrary
properties (unlike "First", "Second")
you can set the Children property to be IDictionary<string,Child>
that said, i totally agree with diego, but if that is the requirement i
think private dictionary and properties accessing it could work
On Sun, Sep 12, 2010 at 11:17 PM, Diego Mijelshon <[email protected]>wrote:
> Supporting arbitrary models defined by the customer is a recipe for
> disaster, unless you are selling a compiler, an IDE or a framework like
> NHibernate.
> Just sayin'.
>
> Diego
>
>
> On Fri, Sep 10, 2010 at 12:10, v64 <[email protected]> wrote:
>
>> 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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