如何访问before_save_instance中的行数据以进行Django导入导出

from django.db.models.signals import pre_save
from django.dispatch import receiver

@receiver(pre_save, sender=YourModel)
def before_save_instance(sender, instance, **kwargs):
    # 在这里执行导入导出操作
    # 可以访问instance对象来获取行数据
    pass

@receiver(pre_save, sender=YourModel)
def before_save_instance(sender, instance, **kwargs):
    # 获取行数据
    field1_value = instance.field1
    field2_value = instance.field2
    # 执行导入导出操作
    pass

from import_export import resources

@receiver(pre_save, sender=YourModel)
def before_save_instance(sender, instance, **kwargs):
    # 获取行数据
    field1_value = instance.field1
    field2_value = instance.field2
    # 执行导入导出操作
    resource = YourModelResource()
    dataset = resource.export_data(queryset=YourModel.objects.filter(id=instance.id))
    # 导出数据
    dataset.export('file.csv', format='csv')
    # 导入数据
    with open('file.csv', 'r') as file:
        dataset = tablib.Dataset().load(file.read(), format='csv')
        resource.import_data(dataset, dry_run=False)