在保存其他多对多相关模型时，自动更新Django模型中的特定字段

from django.db import models
from django.db.models.signals import m2m_changed
from django.dispatch import receiver

class ModelA(models.Model):
    field1 = models.CharField(max_length=100)
    field2 = models.CharField(max_length=100)
    m2m_field = models.ManyToManyField(ModelB)

@receiver(m2m_changed, sender=ModelA.m2m_field.through)
def update_field(sender, instance, action, **kwargs):
    if action in ['post_add', 'post_remove', 'post_clear']:
        # 执行需要的更新操作
        instance.field1 = "更新后的值"
        instance.save()