Did you add the required decorator before this function? (The function is not part of the class; its a standalone appearing in the same module.)
Also, you generally don't put returns in the post_save function: but you do need to call save() on the model instance. Another example here: https://stackoverflow.com/questions/13014411/django-post-save-signal-implementation On Tuesday, 23 April 2019 16:31:43 UTC+2, omar ahmed wrote: > > yes i studied this tutorial before and i added this function to "Club" > class (( Receiver function class )) but it does not affect fields > def teampoints( sender, instance, **kwargs): > if instance.score_local > instance.score_visitor: > return instance.club_local.won +1 and instance.club_visitor.lost + 1 > elif instance.score_local < instance.score_visitor: > return instance.club_local.lost + 1 and instance.club_visitor.won + 1 > else: > return instance.club_local.draw + 1 and instance.club_visitor.draw + 1 > > > On Tuesday, April 23, 2019 at 3:27:28 PM UTC+2, Derek wrote: >> >> You need to use Django signals to provide a custom "post_save". There is >> a good tutorial here: >> >> https://simpleisbetterthancomplex.com/tutorial/2016/07/28/how-to-create-django-signals.html >> >> >> On Monday, 22 April 2019 16:22:19 UTC+2, omar ahmed wrote: >>> >>> i put this function in "Match" class : >>> def points(self): >>> if self.score_local > self.score_visitor: >>> return (self.club_local.won)+1 and (self.club_visitor.lost)+1 >>> elif self.score_local < self.score_visitor: >>> return (self.club_local.lost)+1 and (self.club_visitor.won)+1 >>> else: >>> return (self.club_local.draw)+1 and (self.club_visitor.draw)+1 >>> and i want it to update fields and 'CalcPoints' function in "Club" class >>> class Club(models.Model): >>> ... >>> def CalcPoints(self): >>> return self.won*3 + self.draw >>> >>> but until now it does not update objects (( how can i use post_save here >>> )) >>> >>> On Saturday, April 20, 2019 at 9:09:01 AM UTC+2, Derek wrote: >>>> >>>> That should just require a basic if/then logic test; "get" the correct >>>> Club object, update the win/loss field and save the Club. Repeat for both >>>> Clubs. >>>> >>>> On Thursday, 18 April 2019 14:09:41 UTC+2, omar ahmed wrote: >>>>> >>>>> thank you for response , derek >>>>> but how can i increment 'win' 'lost' or 'draw' Club fields by 'winner' >>>>> Match field >>>>> >>>>> On Wednesday, April 17, 2019 at 3:26:22 PM UTC+2, Derek wrote: >>>>>> >>>>>> 1. Add a "winner" field to your Match >>>>>> 2. Implement a post_save signal for the Match model that updates the >>>>>> "won" or "lost" fields for each Club in the match (simple if/then logic >>>>>> based on winner). >>>>>> >>>>>> PS I think the default values for "won" and "lost" for a Club should >>>>>> be "0" and not "1". >>>>>> >>>>>> On Tuesday, 16 April 2019 20:19:34 UTC+2, omar ahmed wrote: >>>>>>> >>>>>>> hello ... i have two models "Club" class and "Match" class and it >>>>>>> has foreign key to Club >>>>>>> now i want to increment "won" field (or draw or lost) in "Club" >>>>>>> class by "score_local" and "score_visitor" in "Match" class .. >>>>>>> how can i do this >>>>>>> class Club(models.Model): >>>>>>> name = models.CharField(max_length=100) >>>>>>> won = models.IntegerField(default=1) >>>>>>> draw = models.IntegerField(default=1) >>>>>>> lost = models.IntegerField() >>>>>>> goal_for = models.IntegerField() >>>>>>> goal_against = models.IntegerField() >>>>>>> >>>>>>> >>>>>>> class Match(models.Model): >>>>>>> play_date = models.DateTimeField('play date') >>>>>>> club_visitor = models.ForeignKey(Club, on_delete=models.CASCADE, >>>>>>> related_name='match_club_visitor') >>>>>>> club_local = models.ForeignKey(Club, on_delete=models.CASCADE, >>>>>>> related_name='match_club_local') >>>>>>> score_visitor = models.IntegerField() >>>>>>> score_local = models.IntegerField() >>>>>>> >>>>>> -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at https://groups.google.com/group/django-users. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/432af72e-69f0-4f17-8e08-a748733fe8e8%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
