Good Morning, Philipp von Weitershausen wrote: > In the issue you write: > >> I can see two ways: >> >> 1. Extend the IAnnotations interface to grow the necessary >> methods and support the existing use cases >> >> 2. Remove the ability from the existing attribute annotation >> and re-write the code that uses it to avoid using __iter__ >> __contains__ and items. > > Both are not acceptable, especially option #1. We can't just change > existing contracts as we see fit.
Right. However, I think it's possible to regard this is a bug in the original contract. Regarding it as a bug might make it possible for us to change the contract. I agree that we need to be careful about changing them though. > Here's what I suggest: We create a new interface based on IAnnotations > that expresses __iter__ and __contains__:: > > class IIterableAnnotations(IAnnotations): > > def __iter__(): > pass > > def __contains__(): > pass Hmm. Looks like an elegant solution to me. When I wrote those options down, I thought that extending an interface wouldn't be too bad, but you're right. Any changes to the API are equally hard to introduce. However, I guess we should be able to integrate this back into the IAnnotations. Is there a reason anyone will care about the distincation of IAnnotations vs. IIterableAnnotations who doesn't know that we hadn't had those methods originally? If there is no reason for the distinction, it should go away, at least long term. I know this comes down to evolving an interface which is hard/impossible to do anyway. > Code that needs iteration or containment functionality can adapt to > IIterableAnnotations. Adapters that actually provide those methods can > register themselves as such (the attribute-annotations adapter will > surely be able to do that). The issue also mentions .items(). Any feelings about that? Christian -- gocept gmbh & co. kg - forsterstraße 29 - 06112 halle/saale - germany www.gocept.com - [EMAIL PROTECTED] - phone +49 345 122 9889 7 - fax +49 345 122 9889 1 - zope and plone consulting and development
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