On Aug 11, 2008, at 3:10 PM, Hedley Roos wrote:
Hi all
A brief example...
Class Triangle subclasses Shape.
In my zcml I have
<adapter
factory=".shape.ShapeExtender"
for="Products.MyProduct.content.shape.Shape"
name="shape-extender"/>
<adapter
factory=".triangle.TriangleExtender"
for="Products.MyProduct.content.triangle.Triangle"
name="triangle-extender"/>
I find that schemaextender tries to call the extender for Shape even
when I am looking (eg. base_edit'ing) at a Triangle instance. This
causes problems with the getOrder method since Shape is not supposed
to know about Triangle's fields.
In extender.py method instanceSchemaFactory we have extenders =
list(getAdapters((context,), ISchemaModifier)) and that returns both
extenders. Is it supposed to do that? And if so is there a zcml
directive which can solve my problem?
My current horrid workaround is to abuse the resolution order and name
the triangle adapter "atriangle-extender".
Why don't you just name both adapters "shape-adapter"? Then the
adapter lookup will only find the "shape-adapter" registered for the
most specific interface that your content type implements. (I'm not
sure whether or not this will work when registering the adapters for
classes, but it will certainly work if you register them for an IShape
interface and an ITriangle interface, which are implemented by the
Shape and Triangle classes respectively, and where ITriangle extends
IShape.)
David Glick
Project Associate
ONE/Northwest
New tools and strategies for engaging people in protecting the
environment
http://www.onenw.org
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