Switched from usign a method that was about to be deprecated to normal code.

            if self.parents:

                # Promote the first parent link in lieu of adding yet another

                # field.

                field = self.parents.value_for_index(0)

                field = next(self.parents.itervalues())

                # Look for a local field with the same name as the

                # first parent link. If a local field has already been

                # created, use it instead of promoting the parent