[Grok-dev] Schema.List using schema.Choice and Source gives error?

[Adam Summers]

Hi there,

I have a source which looks like this:

@provider(schema.interfaces.IContextSourceBinder)
def AccountMasterSource(context):
        return(schema.vocabulary.SimpleVocabulary([schema.vocabulary.SimpleTerm(item.__name__, item.name) for item in grok.getSite()['AccountMaster'].values()]))

Which works beautifully here when I have code in an interface as thus:

class IGLLine(interface.Interface):
        """A GL Line"""        
	entryDate = schema.Date(title=u"Date", default=date.today())
        account = schema.Choice(title=u"Account", source=AccountMasterSource)

... but will not work in the following interface ....

class IGLTransactionLine(interface.Interface):
        """This is the subline"""
        account = schema.Choice(title=u"Account", source=AccountMasterSource)
        drcr = schema.Choice(title=u"Debit/Credit", values=['DR', 'CR'], default='DR')

class IGLTransaction(interface.Interface):
        entryDate = schema.Date(title=u"Date", default=date.today())
        transactions = schema.List(title=u"Transactions",
                value_type=schema.Object(title=u'Transactions', schema = IGLTransactionLine),
                default=[],
                required=False)

When I add a GLTransaction, I get the following error (see traceback in attachment).

File '/Users/adamsummers1/.buildout/eggs/zope.schema-3.7.0-py2.6.egg/zope/schema/_field.py', line 481 in _validate_fields
  attribute.validate(getattr(value, name))
File '/Users/adamsummers1/.buildout/eggs/zope.schema-3.7.0-py2.6.egg/zope/schema/_bootstrapfields.py', line 147 in validate
  self._validate(value)
File '/Users/adamsummers1/.buildout/eggs/zope.schema-3.7.0-py2.6.egg/zope/schema/_field.py', line 325 in _validate
  if value not in vocabulary:
TypeError: argument of type 'function' is not iterable

... and its because of the source specified in the schema.Choice.

Is my interface defined the correct way?

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I've also included a simplified extract of the code...

Once again, thanks for the help!
Adam