Save two instances on same model in django - django

Question

In my case, it a treasury managing app, the task is i want to transfer an amount x from treasury A to treasury B, from bank to cashier or from paypal acc to my bank, i m adding two instances to same table (treasuryitem) but with different details (treasury). in the code bellow, i got two instances but the field treasury doesn t save as i choose, it save same, for ex treasury A in both instances. Also, i would like to fill only first form and treasury of second form, and the other fields of second form have to save automatically (name=name, date=date, debit=credit, credit=debit). Anyone can help pls. thanks in advance
MODEL :
class Treasury(models.Model):
name = models.CharField(max_length=256)
class TreasuryItem(models.Model):
treasury = models.ForeignKey('Treasury', on_delete=models.CASCADE)
date = models.DateField(default=timezone.now)
name = models.CharField(max_length=256)
debit = models.DecimalField(max_digits=20, decimal_places=2, null=True, blank=True)
credit = models.DecimalField(max_digits=20, decimal_places=2, null=True, blank=True)
FORM :
class TreasuryItem1Form(ModelForm):
class Meta:
model = TreasuryItem
fields = "__all__"
class TreasuryItem2Form(ModelForm):
class Meta:
model = TreasuryItem
fields = "__all__"
VIEW:
def TreasuryItem_Create(request, pk):
treasurys = Treasury.objects.all()
treasury = treasurys.get(id=pk)
form1 = TreasuryItem1Form()
form2 = TreasuryItem2Form()
if request.method == 'POST':
form1 = TreasuryItem1Form(request.POST)
form2 = TreasuryItem2Form(request.POST)
if form1.is_valid() and form2.is_valid():
form1.save()
form2.save()
return redirect('treasury_profile', pk)

Answer 1

You don't need two form instances. Simply re-save the instance after sets id as None in order to force a new insert in the database.
def TreasuryItem_Create(request, pk):
treasurys = Treasury.objects.all()
treasury = treasurys.get(id=pk)
form1 = TreasuryItem1Form()
if request.method == 'POST':
form1 = TreasuryItem1Form(request.POST)
if form1.is_valid() and form2.is_valid():
treasury_item = form1.save()
treasury_item.id = None
# modify any other field if need
# treasury_item.name = 'my new name`
treasury_item.save()
return redirect('treasury_profile', pk)