def has_subform_data(self, subform_name, data):
    prefix = self.add_prefix(subform_name)
    return len([ k.startswith(prefix) for k in data.keys() ]) != 0
mapping old key to new key
dataset/ETHPy150Open cloudera/hue/desktop/core/src/desktop/lib/django_forms.py/MultiForm.has_subform_data--crossover with--dataset/ETHPy150Open zhongbiaodev/py-mysql-elasticsearch-sync/es_sync/__init__.py/ElasticSync._mapper