vocabularies/example_vocabulary.py

from plone import api
from zope.interface import implementer
from zope.schema.interfaces import IVocabularyFactory
from zope.schema.vocabulary import SimpleTerm
from zope.schema.vocabulary import SimpleVocabulary


@implementer(IVocabularyFactory)
class ExampleVocabularyVocabulary(object):
    """
    """

    def __call__(self, context):
        # as an example we create a vocabulary of all News Items items in the portal:
        items = [
            VocabItem(u'sony-a7r-iii', _(u'Sony Aplha 7R III')),
            VocabItem(u'canon-5d-iv', _(u'Canon 5D IV')),
        ]

        # create a list of SimpleTerm items:
        terms = []
        for item in items:
            terms.append(
                SimpleTerm(
                    value=item.token,
                    token=str(item.token),
                    title=item.value,
                )
            )
        return SimpleVocabulary(terms)


ExampleVocabularyVocabularyFactory = ExampleVocabularyVocabulary()