Trying to access job files on results page gives "Assertion error: Model object must be export-able" about waves-core HOT 2 CLOSED

        assert isinstance(self.object, ExportAbleMixin),' Model object must be Export-able'
        self.object.serialize()

class ExportAbleMixin(object):
    """ Some models object may be 'exportable' in order to be imported elsewhere in another WAVES app.
    Based on Django serializer, because we don't want to select fields to export
    """

    def serializer(self, context=None):
        """ Each sub class must implement this method to initialize its Serializer"""
        raise NotImplementedError('Sub classes must implements this method')

    def serialize(self):
        """ Import model object serializer, serialize and write data to disk """
        from os.path import join
        from waves.wcore.settings import waves_settings
        import json
        file_path = join(waves_settings.DATA_ROOT, self.export_file_name)
        with open(file_path, 'w') as fp:
            try:
                serializer = self.serializer()
                data = serializer.to_representation(self)
                fp.write(json.dumps(data, indent=2))
                return file_path
            except Exception as e:
                raise ExportError('Error dumping model {} [{}]'.format(self, e))

    @property
    def export_file_name(self):
        """ Create export file name, based on concrete class name"""
        return '{}_{}.json'.format(self.__class__.__name__.lower(), str(self.pk))