Questions tagged [django-signals]

Django signals allow listeners to be registered for events within the framework. This allows decoupled handling of, for example, model deletions.

Quote from docs:

Django includes a “signal dispatcher” which helps allow decoupled applications get notified when actions occur elsewhere in the framework. In a nutshell, signals allow certain senders to notify a set of receivers that some action has taken place. They’re especially useful when many pieces of code may be interested in the same events.

See documentation.

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Django Error: 'RelatedManager' object has no attribute 'save'

This is my model: class Stock_Total(models.Model): purchases = models.ForeignKey(Purchase,on_delete=models.CASCADE,null=True,blank=True,related_name='purchasetotal') stockitem =…

asked Nov 02 '18 at 08:00

Niladry Kar

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Testcases for SIgnals Django

Hi I have been trying to write the test case for the following post save signal, without any success. Can anyone help. @receiver(post_save, sender=Item, dispatch_uid="item_created") def notify_member_item_create(sender, instance, **kwargs): …

django unit-testing tdd django-signals

asked Aug 04 '16 at 07:35

Ayush Srivastava

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Setting variables with Django signals without using globals

In Django 1.9 I construct a list of forms based on a database table corresponding to TheModel in my forms.py. When the database table changes I want the forms to change as well. Therefore I set up a Django signal to listen to the change and update…

python django django-signals

asked Jun 08 '16 at 09:55

Jarno

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Update other fields during the save

I have declared a signal for the UserProfile model which updates some other fields. The stored data are coming from a web service. post_save.connect(user_profile_update, sender=UserProfile) in user_profile_update, i did this: profile =…

django django-models django-signals

asked Apr 04 '13 at 21:35

cem

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Django: signal doesn't work well with ForeignKey

models.py from django.db import models class Post(models.Model): text = models.TextField() approved = models.BooleanField(default=False) group = models.ForeignKey('bot_users.BotUserGroup', on_delete=models.SET_NULL, null=True,…

python django django-rest-framework django-signals aiogram

asked Aug 12 '23 at 19:46

Bte Deni

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How do I use Signals i Django to Calculate Age based on Date entered, if entered at all?

We do not use Date of Birth as a mandatory field during signup. But, in the Model we have an auto-calculate function to arrive at the 'Age' of the user. So while this works fine when using Django built-in registration mechanism, it fails with…

django django-models django-views django-forms django-signals

asked Aug 01 '21 at 09:08

Feramonics

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Django. Related model returns None after primary model save

I have two models: Item and Photo. Item is foreignkey to Photo so one item can have many photos connected which is quite usual. Item class: class Item(models.Model): name = models.CharField('Item Name', max_length = 150, null = False, …

python django django-models django-signals

asked Feb 26 '16 at 08:27

Hazaard

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