You can use "smart selects":
https://github.com/digi604/django-smart-selects
Works for both normal forms and in the admin.
On Wednesday, 28 March 2018 23:02:36 UTC+2, James Farris wrote:
>
> Hi,
>
> I'm trying to populate a 'vaccine' dropdown based on a 'species' of a
> pet. For example, if a pet is a 'dog' I want to display vaccines for a dog
> only. If a pet is a cat, I want to display a list of vaccines for cats
> only.
>
> How do I do this? I googled, but didn't come up with anything solid.
>
> *Here is my models.py*
>
> class Pet(models.Model):
> user = models.ForeignKey(User, on_delete=models.CASCADE, null=True)
> name = models.CharField(max_length=100, null=True, db_index=True)
> species = models.CharField(choices=SPECIES_CHOICES, null=True,
> max_length=20)
>
> def __str__(self):
> return self.name
>
>
> class Vaccine(models.Model):
> vacc_name = models.CharField(max_length=100)
> species = models.CharField(choices=SPECIES_CHOICES, null=True,
> max_length=20)
> pet = models.ManyToManyField(Pet, through='PetHasVaccine')
>
> def __str__(self):
> return self.vacc_name
>
>
> class PetHasVaccine(models.Model):
> pet = models.ForeignKey(Pet, on_delete=models.DO_NOTHING)
> vaccine = models.ForeignKey(Vaccine, on_delete=models.DO_NOTHING)
>
> def __str__(self):
> return str(self.pet.name) + ' - ' + str(self.vaccine.vacc_name)
>
>
>
> *Here is my views.py*
>
>
> def add_vaccine(request, pet_pk):
> pet = Pet.objects.get(pk=pet_pk)
> if pet.user == request.user:
> form = VaccineForm(request.POST or None)
> if request.POST:
> if form.is_valid():
> return HttpResponse(form)
> else:
> return render(request, 'pet/vaccine_add.html', {'vacc_form':
> VaccineForm(request.POST), 'pet': pet})
> else:
> return render(request, 'pet/vaccine_add.html', {'vacc_form':
> form, 'pet': pet})
>
>
>
> *Here is my forms.py*
>
>
> class VaccineForm(ModelForm):
>
> class Meta:
> model = PetHasVaccine
> fields = '__all__'
> exclude = ('pet',)
> widgets = {
> 'date_given': DateInput(),
> 'date_due': DateInput(),
> }
>
>
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