Re: Mapping rewrite

Exactly what I needed!
Very cool!

On Sun, Jun 29, 2008 at 6:33 PM, Fabio Maulo <[email protected]> wrote:

> Ok.
>
> Do you can't use the SecondPassCommand delegate ?
>
> Mappings.AddSecondPass(SecondPassCommand)
> Mappings.AddSecondPass(SecondPassCommand, bool)
>
>
> 2008/6/29 Ayende Rahien <[email protected]>:
>
>> Sure. Sorry for that, I sometimes assume that everyone else knows whatever
>> I know.
>>
>> This is related to partial domain models.
>>
>> http://www.ayende.com/Blog/archive/2008/01/12/Creating-Partial-Domain-Models.aspx
>>
>> Imagine this entity:
>>
>> public class Permission
>> {
>>     public Guid Id { get; set; }
>>     public string Name { get; set; }
>>     public IUser User { get; set; }
>> }
>>
>> public class UsersGroup
>> {
>>     public Guid Id { get; set; }
>>     public string Name { get; set; }
>>     public ISet<User> Users { get; set; }
>> }
>>
>> Now, what I want to do is to be able to decide, at configuration time,
>> what is the concrete type that will be mapped to Permission.User.
>> The idea is to allow packaging this as a compiled DLL and then allow
>> different models to plug into this.
>> I can do this manually easily enough, by setting the class="" attrib on
>> the relevant mapping, but I want to be able to do this automatically and
>> programatically.
>>
>> Here is a simple example of what I want:
>>
>> cfg = new Configuration().AddAssembly("MyDomain").AddAssemly("Security");
>>
>> RewriteReferences.From<IUser>().To<MyUser>();
>>
>> cfg.BuildSessionFactory();
>>
>> This will allow me to perform this modification without having to modify
>> the mapping files.
>> I could touch the NH mapping API directly.
>>
>>
>> On Sun, Jun 29, 2008 at 5:45 PM, Fabio Maulo <[email protected]>
>> wrote:
>>
>>> Oren, do you can explain the situation ? (the problem to solve... the
>>> analysis... something in English...)
>>> I can't understand where put a code-chunk if I don't understand the
>>> target...
>>>
>>> Do you are trying to solve a generic association ?
>>> Do you have an interface in the mapping but you want strongly-type it
>>> before build-session-factory ?
>>>
>>> If this is the issue, would be better to end the study around
>>> "mapping-source".
>>>
>>> BTW without an whole picture I have some problem to understand what you
>>> need.
>>>
>>>
>>> 2008/6/29 Ayende Rahien <[email protected]>:
>>>
>>>> Runtime in this context means _before_ we call BuildSessionFactory, but
>>>> without touching the source XML files.
>>>> Ideally, I want to be able to run this at some point at the config build
>>>> lifetime:
>>>>
>>>> PersistentClass classMapping = cfg.GetClassMapping(userType);
>>>> foreach (PersistentClass persistentClass in cfg.ClassMappings)
>>>> {
>>>>     //ignore non Rhino Security entities
>>>>     if (persistentClass.MappedClass.Assembly != typeof(IUser).Assembly)
>>>>         continue;
>>>>
>>>>     foreach (Property property in persistentClass.PropertyIterator)
>>>>     {
>>>>         ManyToOne manyToOne = property.Value as ManyToOne;
>>>>         if (manyToOne == null || manyToOne.ReferencedEntityName !=
>>>> typeof(IUser).FullName)
>>>>             continue;
>>>>         ManyToOne value = new ManyToOne(classMapping.Table);
>>>>         value.ReferencedEntityName = userType.FullName;
>>>>         foreach (ISelectable selectable in manyToOne.ColumnIterator)
>>>>         {
>>>>             Column col = selectable as Column;
>>>>             if (col != null)
>>>>             {
>>>>                 value.AddColumn(col);
>>>>             }
>>>>         }
>>>>         property.Value = value;
>>>>
>>>>         Collection collection = property.Value as Collection;
>>>>         if (collection == null || collection.IsOneToMany ||
>>>>             collection.GenericArguments.Length != 1 ||
>>>>             collection.GenericArguments[0] != typeof(IUser))
>>>>             continue;
>>>>         IValue element = collection.Element;
>>>>     }
>>>>
>>>>     foreach (ForeignKey key in persistentClass.Table.ForeignKeyIterator)
>>>>     {
>>>>         if (key.ReferencedEntityName != typeof(IUser).FullName)
>>>>             continue;
>>>>
>>>>         key.ReferencedEntityName = userType.FullName;
>>>>         key.ReferencedTable = classMapping.Table;
>>>>     }
>>>> }
>>>>
>>>> On Sun, Jun 29, 2008 at 5:09 PM, Fabio Maulo <[email protected]>
>>>> wrote:
>>>>
>>>>> 2008/6/29 Ayende Rahien <[email protected]>:
>>>>>
>>>>>> I am _not_ interested in changing the XML. I am interested in
>>>>>> selecting, at runtime, what is the class of the many-to-many association.
>>>>>> There is a difference between them
>>>>>>
>>>>>>
>>>>> At run-time ok; but when ?
>>>>> You know, NH do the hard work of mapping at build-session-factory-time.
>>>>>
>>>>> So far only using <any> you can have an association really resolved at
>>>>> run-time.
>>>>>
>>>>> I need to understand what you are looking for to study the situation.
>>>>> --
>>>>> Fabio Maulo
>>>>>
>>>>> -------------------------------------------------------------------------
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>>>>> Nhibernate-development mailing list
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>>>>>
>>>>>
>>>>
>>>>
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>>>>
>>>
>>>
>>> --
>>> Fabio Maulo
>>> -------------------------------------------------------------------------
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>>>
>>
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>
>
> --
> Fabio Maulo
>
> -------------------------------------------------------------------------
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>

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