[Product-Developers] Default value for fields introduced through a behavior

[Andreas Jung]

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I have a Dexterity-based content-type that uses the following
behavior:

class IProductSelection2L(form.Schema):

    form.fieldset(
        'product_selection2l',
        label=u'Produktauswahl',
        fields=['product_selection2l'],
        )

    product_selection2l = schema.List(title=u'Produktauswahl',
value_type=schema.TextLine())
    form.widget(product_selection2l=ProductGroupsWidgetFactory)

alsoProvides(IProductSelection2L, IFormFieldProvider)

class ProductSelection2L(object):
    adapts(IDexterityContent)

    def __init__(self, context):
        self.context = context

    def _get_product_selection2l(self):
        return self.context.product_selection2l or []
    def _set_product_selection2l(self, value):
        self.context.product_selection2l = value
    product_selection2l = property(_get_product_selection2l,
_set_product_selection2l)


Obviously instances of my type using the behavior created
through invokeFactory() do not have the 'product_selection2l'
property automatically. How do you initialize a Dexterity type
properly in order to have all properties introduced by behavior
initialized properly? The workaround right now is to define
'product_selection2l' as a class-level variable in my content class but
this is only a weird workaround...how to do that properly?

Andreas
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