[Zope3-Users] object hierarchy

[Ivan Horvath]

Dear Frank,

i think i did something similar
first to define the category container, and contained
and this is working fine, i can add new category objects into the
category container.

i have problem with the next level, whereas the category, which is
contained from the category point of view, but it is a container from
the type point of view.
how can i define this ?

On 3/14/07, FB <fbo2 at gmx.net> wrote:
> On Wed, Mar 14, 2007 at 04:35:53PM +0100, Ivan Horvath wrote:
> > Dear All,
> >
> > i'm really new to zope, but i have learning application, where the
> > object stru is little bit complex.
> >
> > App
> >  |
> >  +---- Categories
> >                |
> >                +------Categ1
> >                             |
> >                             +----Type1
> >                                       |
> >                                       +-----Article1
> >                                                  |
> >                                                  +------Article2
> >                             +-----Type2
> >
> >                +------Categ2
> > +----- Administration
> > etc
> >
> > i could manage the administration part and in the categories container
> > i can add new category objects.
> > but i cannot add into a category object a type container.
> > i don't really know how to define an interface which is contained and
> > container too.
>
> I'm not sure, if I understand your problem correctly. It's possible to
> define a set of valid subobjects for each interface:
>
> class IType(IContainer):
>    pass
>
> class ICategory(IContainer):
>    contains(IType)
>
> class ICategoryContainer(IContainer):
>    contains(IType)
>
> [...]
>
> class Type(BTreeContainer):
>    implements(IType)
>
> class Category(BTreeContainer):
>    implements(ICategory)
>
> class CategoryContainer(BTreeContainer):
>    implements(ICategoryContainer)
>
> There's nothing special about those kind of "constraint-trees". Now I'm
> guessing: did you forget to specify a <browser:containerViews> and a
> <browser:addMenuItem> ZCML-directive per class?
>
> Regards,
>
> Frank
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