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POIs there a way to dynamically change the model used in an UpdateView with Django?
 

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  1. POIs there a way to dynamically change the model used in an UpdateView with Django?
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    <p>The application I'm writing includes a pipeline for creating events. An <code>Event</code> is proposed by one class of users, then approved and edited by administrators. The problem for me is that there is a subclass of <code>Event</code>, <code>ScoredEvent</code>, which the administrators should be able to specify on-the-fly. This adds a <code>ScoredEvent.competition</code> foreign key and overrides the <code>Event.participants</code> to put them through a table that includes an associated score for each participant.</p> <p>Ideally, a normal user creates an event containing only the name and a short description (easy enough to do by limiting the fields on the non-admin CreateEventForm) then the admins can go back in and fill out the other fields when they are approving the event.</p> <p>The problem I'm hitting is I don't know how it would be possible for an administrator to change an <code>Event</code> to a <code>ScoredEvent</code> in the approval form view when they are editing it or how to make that happen. My vision of the page is an edit view with a checkbox labeled "Tie To Competition" that, when checked, would allow the admin to select a competition and then save the event as a <code>ScoredEvent</code>. If that box weren't checked, the event would continue it's life as an <code>Event</code>.</p> <p>Where should this be handled? My gut feeling is that I should do something special in the forms.py or something in the Templates, but I don't know where I should begin.</p> <pre><code>class Event(models.Model): """Representation of any community event""" name = models.CharField(max_length=50, unique_for_date="start_datetime") slug = models.SlugField(max_length=57) # length +7 for datestamp description = models.TextField() location = models.CharField(max_length=100, blank=True) start_datetime = models.DateTimeField('Start', blank=True) end_datetime = models.DateTimeField('End', blank=True) participants = models.ManyToManyField(Participant) def save(self, *args, **kwargs): if not self.slug: self.slug = slugify(self.name)+'-'+datetime.now().strftime("%d%m%y") super(Event, self).save(*args, **kwargs) def __unicode__(self): if self.start_datetime: return "%s (%s)" % (self.name, self.start_datetime.date()) else: return self.name class ScoredEvent(Event): """Representation of an event that is tied to a competition""" competition = models.ForeignKey(Competition) participants = models.ManyToManyField(Participant, through="ScoredParticipant") def is_scored(self): """Returns true if any of the participants has a score, else returns false""" for participant in self.participants.objects.all(): if participant.score != 0: return False return True class ScoredPartcipant(models.Model): """Participant and associated score for an event""" participant = models.ForeignKey(Participant) event = models.ForeignKey(ScoredEvent) score = models.IntegerField(default=0) </code></pre>
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    1. USKapura
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    1. COYou need a foreign key from `ScoredEvent` to the normal `Event`, then admin creates a `ScoredEvent` linked to the normal `Event` that the user populates.
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      1. POIs there a way to dynamically change the model used in an UpdateView with Django?
      1. USBurhan Khalid
 

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