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/292b1f7f-d360-4db8-8605-1a9647df6600%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
