Re: Custum save on Foreignkey in Admin

Hey Rob,

You can override save_formset() method of ModelAdmin for this. Create
a method update_total_amount(self) in your Ticket Model.

class TicketAdmin(admin.ModelAdmin):
def save_formset(self, request, form, formset, change):
instances = formset.save(commit=False)
for instance in instances:
instance.user = request.user
instance.save()
formset.save_m2m()

## call update_total_amount()
instance.update_total_amount()

Useful Links -
1. https://docs.djangoproject.com/en/1.4/ref/contrib/admin/#django.contrib.admin.ModelAdmin.save_formset
2. https://docs.djangoproject.com/en/1.4/ref/contrib/admin/#django.contrib.admin.ModelAdmin.save_formset

Sincerely,
Pankaj Singh
http://about.me/psjinx


On Sat, Feb 2, 2013 at 8:29 PM, Rob <rob@wieskamp.nl> wrote:
> I have two models:
>
> class Tickets(models.Model):
> ticketnumber = models.IntegerField()
> total_amount = models.DecimalField()
>
> class TicketItems(models.Model):
> name = models.Charfield(max_length=30)
> ticket = models.ForeignKey(Tickets)
> price = models.DecimalField()
> amount = models.IntergerField()
>
> I have an inline Adminpage were users can add TicketItems. How do I update
> the total_amount of model Tickets from all TicketItems on save (price *
> amount)?
>
> Django 1.4
>
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