django-signals Questions
3
Solved
I want to do a data denormalization for better performance, and put a sum of votes my blog post receives inside Post model:
class Post(models.Model):
""" Blog entry """
author = models.ForeignKe...
Bimbo asked 7/4, 2011 at 14:4
3
Solved
I'm doing some kind of refactoring for my project, where I'm relying on the django django.contrib.auth.models.Permission model. So far I define the permissions for each new user using a post_save s...
Shushan asked 7/9, 2015 at 22:29
2
Solved
I'm working with Django signals, but they seem to be received twice, even if emitted once. Here's the code I'm working with (it's a simple wrapper to use Uploadify with Django)...
# Signal-emittin...
Stelmach asked 25/9, 2009 at 17:35
3
Solved
having read the docs,
https://docs.djangoproject.com/en/dev/topics/signals/
i have created this in my signals.py file:
from django.db.models.signals import post_save
from django.dispatch import r...
Swallowtail asked 24/5, 2012 at 13:47
5
Solved
I have a django rest app using django rest auth.
I'm trying to log something everytime a user log in using signals.
I've searched on the web on how to use signals and I haven't found any interesti...
Tessera asked 8/4, 2017 at 20:59
5
Solved
I have a question about django.
I have ManyToMany Models here
class Product(models.Model):
name = models.CharField(max_length=255)
price = models.DecimalField(default=0.0, max_digits=9, decimal...
Sexology asked 22/10, 2012 at 15:14
4
Solved
I have a tough time understanding how signals work into my application (and how they work period). These are three areas where I assume they would apply (with my current knowledge):
Send XML to a...
Soso asked 19/1, 2010 at 21:26
4
Solved
I have an AppConfig.ready() implementation which depends on the readiness of an other application.
Is there a signal or method (which I could implement) which gets called after all application rea...
Cowes asked 17/8, 2018 at 9:37
3
I am trying to develop an auction type system, where a customer makes an order, and then different stores can offer a price for that order.
An interesting part of this system is that when the ord...
Cowpox asked 6/10, 2017 at 22:3
8
Solved
Based on Django's documentation I was reading, it seems like signals.py in the app folder is a good place to start with, but the problem I'm facing is that when I create signals for pre_save and I ...
Bartonbartosch asked 18/8, 2011 at 22:53
7
Solved
I have a signal_handler connected through a decorator, something like this very simple one:
@receiver(post_save, sender=User,
dispatch_uid='myfile.signal_handler_post_save_user')
def signal_hand...
Shantel asked 28/10, 2012 at 19:39
1
Solved
I really can't find anything solid in the docs. Lets say I'm doing something like this:
from django.db.models.signals import post_save
from django.dispatch import receiver
class Item(models.Model...
Matronize asked 6/4, 2019 at 18:29
3
Solved
I need to do some background post-processing on newly created objects in Django. This post-processing should only run on new objects, not objects that are just updated.
I know that in pre_save I c...
Mondrian asked 20/5, 2012 at 10:16
1
Solved
Is there a way to start a Viewflow process with Django model post_save signal. I managed to do this:
//start viewflow process
start = (
flow.StartSignal(post_save, create_dest_flow)
.Next(this.a...
Kempis asked 30/12, 2018 at 19:39
4
Solved
I read about django signals (http://docs.djangoproject.com/en/dev/topics/signals/), but as far as I understand, signals are never converted into literal SQL triggers (http://en.wikipedia.org/wiki/D...
Callaghan asked 21/8, 2010 at 21:52
2
Personally I like using signals:
from django.db import models
from django.db.models.signals import pre_save
class MyModel(models.Model):
...
def custom_action_before_saving(sender, instance, *...
Arad asked 11/3, 2016 at 20:55
3
Solved
class Badge(SafeDeleteModel):
owner = models.ForeignKey(settings.AUTH_USER_MODEL,
blank=True, null=True,
on_delete=models.PROTECT)
restaurants = models.ManyToManyField(Restaurant)
identifier =...
Haslam asked 3/9, 2018 at 9:49
5
Solved
I'm having trouble wrapping my head around this. Right now I have some models that looks kind of like this:
def Review(models.Model)
...fields...
overall_score = models.FloatField(blank=True)
...
Standish asked 4/10, 2008 at 13:37
3
I am using django 2.0.8 and Python 3.5. I want to be able to send and receive custom signals when an object is saved to the database.
I have followed the Django documentation on listening to signa...
Kerguelen asked 31/8, 2018 at 10:32
1
Solved
Imagine I have a model called A, which has a field called name. How can I get previous value and new value in pre_save signal?
@receiver(pre_save, sender=A)
def signal_product_manage_latest_versi...
Demagogic asked 9/8, 2018 at 20:46
1
Solved
I am trying to make SignalProcessor as per haystack documentation, here is my code:
from haystack.signals import RealtimeSignalProcessor
from products.models import ProductCreateModel
from django....
Mcandrew asked 25/7, 2018 at 15:13
1
Solved
I have a question regarding the usage of dispatch_uid for signals.
Currently, I am preventing multiple usage of the signal by simply adding if not instance.order_reference. I wonder now if dispatc...
Illboding asked 15/6, 2018 at 18:21
1
Solved
I can't understand why my m2m_changed signal is not triggered.
Here is the code:
models.py
class Badge(TimeStampable, Expirable, Deactivable,
SafeDeleteModel):
_safedelete_policy = HARD_DELETE...
Maui asked 31/5, 2018 at 13:25
0
I am using post_save signal to trigger the creation of profile data for User instance. The problem is if I create a User object from data migration then the post_save signal isn't triggering.
Howe...
Gaitskell asked 13/5, 2018 at 18:13
2
Solved
For setting up new development systems I would like to have a "post initial migration" signal.
It seems that something like this does not exist yet.
In detail: I want a signal which runs after th...
Banks asked 3/5, 2018 at 9:23
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