Django Form Processing - how to create a record and add it as ForeignKey

I would like to solve a problem in form handling my views.py.

I would like to process a ModelForm. Instead of letting the user fill the field Field fk_transaction I would like to create a new Record of Transaction and add it as a ForeignKey in the background to the CcountBooking. The Form is displayed correctly in the the template. Also a Transaction is successfully created. However when I want to add and save it to the form in views.py it throws an error telling me that the field is not existing. Thanks for any help!

My views.py:

from django.http import HttpResponse
from django.shortcuts import render
from forms import AccountBookingForm
from models import Transaction


def deposit(request):
    context = {}
    if request.method == "POST":
        form = AccountBookingForm(request.POST)
        t = Transaction()
        form.fk_transaction = t
        form.save()
        return render(request, "deposit_success.html", {"form": form})
    else:
        form = AccountBookingForm()
        return render(request, "deposit.html", {"form": form})

My models.py:

class Transaction(models.Model):
    type = models.CharField(max_length=11, choices=TR_TYPE_CHOICES, default=DEPOSIT)
    status = models.CharField(max_length=11, choices=TR_STATUS_CHOICES, default=DRAFT)
    text = models.TextField(max_length=500, default="", blank=True)


class AccountBooking(models.Model):
    fk_bankaccount = models.ForeignKey(
        BankAccount, on_delete=models.CASCADE, blank=False)
    fk_transaction = models.ForeignKey(Transaction, on_delete=models.CASCADE, blank=False)
    value = models.DecimalField(max_digits=14, decimal_places=2, blank=False)

My forms.py

from django.forms import ModelForm
from .models import AccountBooking

class AccountBookingForm(ModelForm):
    class Meta:
        model = AccountBooking
        fields = ["__all__"]
        exclude = ("fk_transaction",)

Check the form, and create a transaction if the form is valid:

from django.shortcuts import redirect, render
from forms import AccountBookingForm
from models import Transaction


def deposit(request):
    if request.method == 'POST':
        form = AccountBookingForm(request.POST, request.FILES)
        if form.is_valid():
            form.instance.fk_transaction = Transaction.objects.create()
            form.save()
            return redirect('name-of-view')
    else:
        form = AccountBookingForm()
    return render(request, 'deposit.html', {'form': form})

Note: While most forms do not process media files, it is probably better to pass request.FILES [Django-doc] to the form anyway, such that if you later add an extra media field, all views that use the form will indeed handle the files properly.

Note: In case of a successful POST request, you should make a redirect [Django-doc] to implement the Post/Redirect/Get pattern [wiki]. This avoids that you make the same POST request when the user refreshes the browser.

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