On 10/11/07, Dean Landolt <[EMAIL PROTECTED]> wrote:
>
> I've been beating my head against the wall trying to figure out how to
> append any class to a class. Below is a simple model...
>
> class Resource(Entity):
> has_field('name', Unicode)
> has_and_belongs_to_many('children', of_kind='Resource',
> enable_typechecks=False)
> has_and_belongs_to_many('parents', of_kind='Resource',
> enable_typechecks=False)
> has_one('metaclass', of_kind='MetaClass', enable_typechecks=False)
>
> def __repr__(self):
> return '<Resource name="%s">' % self.name
>
> class MetaClass(Entity):
> belongs_to('resource', of_kind='Resource')
>
> class File(Entity):
> has_field('filename', Unicode)
> has_field('hash', String(32))
> belongs_to('resource', of_kind='Resource', inverse='asset')
>
> def __repr__(self):
> return '<File filename="%s">' % (self.filename)
>
>
> When I create a resource and append File object to it, it seems to
> work just fine, but the flush apparently fails silently -- both
> objects get created, but their association goes away...
>
>
> r = Resource(name='testresource')
> r.metaclass = File(filename='yadayada')
> r.flush()
Well, it doesn't work that way. To get polymorphism, you should make
File inherit from MetaClass and use:
using_options(polymorphic=True)
in both classes.
Note that this will only work with Elixir trunk and not 0.3.
Hope this helps,
--
Gaëtan de Menten
http://openhex.org
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