forms.py 文件源码

def decompress(self, value):
        # if the value is the actual model instance, don't try to look up model
        if isinstance(value, Model):
            return [self.display_value(value), value.pk]
        elif value:
            o = self.model.objects.get(pk=value)
            return [self.display_value(o), value]
        return ['', None]