具有多表继承的父类上的Django post_save信号

Question

在 Django 中，如果您有使用多表继承的模型，并且您在父类上为 post_save 信号定义了一个接收器，那么在保存子类的实例时会调用该接收器函数吗？

借用例子from another question :

class Animal(models.Model):
    category = models.CharField(max_length=20)

class Dog(Animal):
    color = models.CharField(max_length=10)

def echo_category(sender, **kwargs):
    print "category: '%s'" % kwargs['instance'].category

post_save.connect(echo_category, sender=Animal)

如果我做:

>>> dog = Dog.objects.get(...)
>>> dog.category = "canine"
>>> dog.save()

请问 echo_category接收器函数被调用？

Answer 1

post_save.connect(my_handler, ParentClass)
# connect all subclasses of base content item too
for subclass in ParentClass.__subclasses__():
    post_save.connect(my_handler, subclass)

祝你今天过得愉快!