无法引用Django中注册到user_logged_in信号的回调函数中的模型

Question

I have a requirement to write a DB row when a user logs in. The following code is in models.py (at end of file, after model definitions);

models.py

from django.contrib.auth.signals import user_logged_in
from utils import *
def rec_login(sender, request, user, **kwargs):
    u_audit('some text here', user)    

user_logged_in.connect(rec_login)

There's a utilities module which is imported in modules.py. The following code is called in utils.py from the above function;

utils.py

from app.models import *
def u_audit(msg,u):
    ua=UserLog(action=msg, user=u, actiontime=datetime.now())
    ua.save()

I'm reusing the u_audit() function in several other places (post-login).

When a user logs in, I get a NameError for the UserLog object (ie it looks like the model definitions can't be accessed by the signal callback function).

The UserLog object referred to above is just a simple models.Model.

Anyone know what I'm missing?

I've tried putting a simple file write in the callback function in models.py and tried the same thing in the u_audit() function. instead and that works fine, so I know it's being called properly. I've got other signal callback functions registered (all post-login) and they're using models and working fine.

Answer 1

Not a circular import? Utils refers to models and models to utils - it will not work. Please change utils.py to:

def u_audit(msg,u):
    from app.models import UserLog
    ua=UserLog(action=msg, user=u, actiontime=datetime.now())
    ua.save()

But also something like that suggest that maybe models.py is good place for u_audit and you should just move it there.