backend.py 文件源码

def prepare_value(self, value):
        if isinstance(value, string_types):
            return value
        if isinstance(value, list):
            return ', '.join(self.prepare_value(item) for item in value)
        if isinstance(value, dict):
            return ', '.join(self.prepare_value(item)
                             for item in value.values())
        return force_text(value)