[Zope3-Users] Interfaces with circular references

[Markus Kemmerling]

Hi Hermann,

Am 21.09.2007 um 14:03 schrieb Hermann Himmelbauer:

> Hi,
> Does someone know how to create interfaces with circular references?
>
> E.g.:
>
> class IHusband(Interface):
>    wife = Object(schema=IWife)
>
> class IWife(Interface):
>    husband = Object(schema=IHusband)
>
> What's the suggested solution to this problem?
>
> Perhaps I should modify the classes after they are declared, e.g.:
>
> class IHusband(Interface):
>    pass
>
> class IWife(Interface):
>    pass
>
> IHusband.wife = Object(schema = IWife)
> IWife.husband = Object(schema = IHusband)
>
> Or is there a better solution?
>

I don't think dot notation works for schema fields, you should use  
mapping notation. Otherwise I had a similar problem some time ago and  
coded it similarly, although slightly simpler:

class IHusband(Interface):
    wife = Object(schema= Interface)

class IWife(Interface):
    husband = Object(schema= IHusband)

IHusband['wife '].schema = IWife

Regards,

Markus Kemmerling
___________________
Medical University Vienna
Core Unit for Medical Education
P.O. Box 10  A-1097 Vienna
phone: +43-1-40 160-36 863  fax: +43-1-40 160-93 65 00
http://www.meduniwien.ac.at/bemaw/


> Best Regards,
> Herman
>
> -- 
> x1 at aon.at
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