Django filtering ForeignKey

Question

Django

Good afternoon!
models.py

class Delivery(models.Model):
    created_on = models.DateTimeField(u"Дата создания", auto_now_add=True)
    datedelivery = models.DateField(u"Дата отгрузки")
    dateofperformance = models.DateTimeField(u"Дата исполнения")
    partner = models.ForeignKey(Partner, verbose_name=u"Контрагент")

КОНТРАГЕНТЫ:
class Partner(models.Model):
    name = models.CharField(max_length=100)
    created_on = models.DateTimeField(auto_now_add=True)

FILTER REQUIRED: Delivery -> Partner in - Delivery:

forms.py
class DeliveryForm(forms.ModelForm):
    partner = forms.ModelChoiceField(label='Контрагент', queryset=Delivery.objects.all())

Gives a list of counterparties that were used in Delivery, but they are duplicated, counterparties are not unique... like

Контрагента1
Контрагента1
Контрагента2
Контрагента1
Контрагента3
Контрагента4
Контрагента2
Контрагента5

forms.py
class DeliveryForm(forms.ModelForm):
    partner = forms.ModelChoiceField(queryset=Delivery.objects.filter().values_list('partner', flat=True).order_by('partner').distinct())

Result: Returns all Unique Accounts in Delivery, but only their id, there is no name field.
We were advised to pass an additional parameter to the form constructor, in your case the partner ID and filter by it. How to do it, I don't know.
There are options?
Thank you!

Answer 1

Contractors are unique, only it should not be "queryset=Delivery.objects.all()" but "queryset=Partner.objects.all()"
But to be honest, the second forms.py ala Frankenstein suggests that you need to somehow agree on what is FILTER REQUIRED"