[Grok-dev] Schema.List using schema.Object + schema.Choice and Source gives error in validation? Bug??

[Adam Summers]

Hi List,

I think I've stumbled across a bug when using schemas to validate input. Please see the app.py attached.

Please have a look at the following tests when using choices in the app.py:
1) a Simple Schema.Choice with static results -- all OK
2) a Simple Schema.Choice using sources -- all OK
3) a Schema.List which contains objects of the type used in in (1) -- all OK
4) a Schema.List which contains objects of the type used in (2) -- this cannot work

and you get the following error:

	Module zope.schema._field:325 in _validate         
>>  if value not in vocabulary:
TypeError: argument of type 'function' is not iterable 

(full traceback is also attached)

The interesting thing to note is that in the 4th test, the object 'value' has an attribute vocabulary which is set to the source function, whereas I have noted when using pdb this is usually a list of simpleterms (ie, the result of the called function).

Please let me know if I'm using the source incorrectly, I've had a frustrating two days trying to get through this.

Any help is much appreciated.

Regards,
Adam

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