[Zope] Subclassing Confusion

[Jeff K. Hoffman]

On Wed, 19 Jan 2000, James W. Howe wrote:

> import Acquisition
> from OFS import Image
> 
> class RenderableImage:
>      def __str__ (self):
> 	Request = self.REQUEST
> 	if Request:
> 	    try:
> 		Method = getattr (self, 'render')
> 	    except AttributeError:
> 		return Image.__str__(self)
> 	    return Method (self, Request)
> 	else:
> 	    return "Renderable error: no request"
> 
> My question is why didn't they show up?  I would have thought that
> absent any other changes to my Image subclass, that the default Image
> views would show up as the views of my new ZClass.

If your ZClass is subclassing RenderableImage directly, then I think this
is your problem:

  class RenderableImage:

should be:

  class RenderableImage(Image):

The way things stand, your RenderableImage class is not a subclass of
Image. Changing the line to read as above fixes that, and will (hopefully)
fix the associated problem you describe.

> Thanks.

Hope this helps.

> James W. Howe

--Jeff

---
Jeff K. Hoffman                                         704.849.0731 x108
Chief Technology Officer                                mailto:jeff@goingv.com
Going Virtual, L.L.C.                                   http://www.goingv.com/