Question

I am using signals to send a mail and is working fine(right now I am testing it and providing the static email address). But I want to use Dynamic values of model fields in my mail function.

e.g. If admin changes anything from admin dashboard in that model a signal is called using post_save and a mail function is called so. But I need id of that user from this model so that I can fetch his name,email_address from auth_user table.

I am sending the name of the model in post_save but i don’t know how to use their fields in signals if possible.

right now I am using this code.

My model

class ABC(models.Model):
  .....
  .......

post_save.connect(handlers.model_saved, sender=ABC)

the signal which is called.

from django.core.mail import send_mail


def model_saved(sender, **kwargs):
    send_mail('Subject here', 'Here is the message.', '[e-mail]',
    ['[e-mail]'], fail_silently=False)
    print "SAVED",sender,kwargs

Terminal response

<class 'XYZ.models.ABC'> {'raw': False, 'instance': <ABC: #1 admin admin 2013-01-04 04:20:50+00:00>, 'signal': <django.dispatch.dispatcher.Signal object at 0xb612584c>, 'using': 'default', 'created': False}

Please suggest me some way so that i can use vales of my model fields in signals.

Thanks.

Answer 1

There is instance argument provided to signal handler which is the Model object saved.
So you can use it as :

def model_saved(sender, **kwargs):
    send_mail('Subject here', 'Here is the message.', '[e-mail]',
    ['[e-mail]'], fail_silently=False)
    abc_obj = kwargs['instance']
    #can use fields as 
    #abc_obj.somefield
    print "SAVED",sender,kwargs

post_save documentation explains this.