Django pre_save信号不起作用 [英] Django pre_save signal does not work
问题描述
我以下列方式测试了Django的pre_save信号，但无法捕捉到任何一个信号。
I tested the "pre_save" signal of Django in the following ways, but cannot catch the signal in either of them.
$
from django.db.models.signals import pre_save
import logging
def my_callback(sender, **kwargs):
logging.debug("======================================")
pre_save.connect(my_callback)
-
运行manage.py shell中的以上代码：
然后我运行我的网站，看到models.save（）成功工作，但回调函数不运行。
Run the above code in manage.py shell: Then I run my website and see models.save() work successfully, but the callback function does not run.
或者，我再次在shell上运行上面的代码，然后在shell中运行models.save（）。 save再次起作用，但回调函数仍然没有任何反应。
Alternatively, I run the above code on shell again and then run models.save() in the shell. "save" works well again but still nothing happens to the callback function.
最后，我将上述代码嵌入到一个 __ init__中。 py 文件，仍然在网站上运行save（）函数。仍然没有发生任何事情。
Finally, I embed the above code in an __init__.py file and still, run the save() function on the website. Still, nothing occurs.
你能帮我找出为什么pre_save信号似乎不起作用吗？
Would you please help me figure out why pre_save signal seems not work?
推荐答案
您没有设置发件人类。
from django.db.models.signals import pre_save
from myapp.models import MyModel
import logging
def my_callback(sender, **kwargs):
logging.debug("======================================")
pre_save.connect(my_callback, sender=MyModel)
其次，如果你使用Django 1.3你应该使用新的装饰器语法。
Secondly, if you're using Django 1.3 you should use the new decorator syntax.
# Inside your models.py
from django.db import models
from django.db.models.signals import pre_save
from django.dispatch import receiver
class MyModel(models.Model):
field1 = models.TextField()
field2 = models.IntegerField()
@receiver(pre_save, sender=MyModel)
def mymodel_save_handler(sender, **kwargs):
logging.debug("======================================")
应该这样做，但是我还没有测试代码所以让我知道如果它还是坏了。
That should do it, but I haven't tested the code so let me know if it's still broken.
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