Ok, that's what I thought. How can I fix the problem? I think I can create an IFosterSourceContainer interface and have the constraint there. Then I would have to implement that interface for FosterRecord. Would that work? Also, is there any other/better way to do it?

Rob Campbell

Philipp von Weitershausen wrote:

Rob Campbell wrote:
Hi Darryl,

That is how I had the IFosterRecord interface before, and I got a lot more errors than just __setitem__. I am only getting the __setitem__ error now, after changing it to something like:

class IFosterRecord(Interface):


  title = TextLine(...)

and the implementation is:

class FosterRecord(BTreeContainer):


  title = FieldProperty(IFosterRecord['title'])

I think the problem is coming from contains().

Yup. contains() adds a __setitem__ method to the interface.

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