def target_urls(self, year=None):
        return [item['raw_url'] for item in self.mappings(year)]
Returns the SQL necessary to make a constraint "initially deferred"
dataset/ETHPy150Open openelections/openelections-core/openelex/us/or/datasource.py/Datasource.target_urls--crossover with--dataset/ETHPy150Open dcramer/django-compositepks/django/db/backends/__init__.py/BaseDatabaseOperations.deferrable_sql