Save method of Django model does not update fields of existing record even if force update - python-3.x

Question

I am trying to update the record that already exists in the database and therefore I use this code
if 'supplierId' not in req.keys():
return JsonResponse({'code': 0, 'msg': "supplier was not selected", 'result': ''}, safe=False)
assigneeId = User.objects.get(pk=req.get('assigneeId', 1))
responsibleId = User.objects.get(pk=req.get('responsibleId', 1))
redistributionMethod = req.get('redistributionMethod', 0)
amount = req.get('allCost', 0)
procurement_doc = ProcurementDocJournal.objects.get(id=pk)
print(procurement_doc)
procurement_doc.docType = req['docType']
procurement_doc.status = req['status']
procurement_doc.companyId = Company.objects.get(pk=req['companyId'])
procurement_doc.datetime = req['datetime']
procurement_doc.supplierId = Partner.objects.get(pk=req['supplierId'])
procurement_doc.assigneeId = assigneeId
procurement_doc.warehouseId = Warehouse.objects.get(pk=req['warehouseId'])
procurement_doc.responsibleId = responsibleId
procurement_doc.redistributionMethod = redistributionMethod
procurement_doc.amount = amount
procurement_doc.comment = req['comment']
procurement_doc.save(force_update=True, update_fields=['comment', 'amount', 'redistributionMethod',
'responsibleId', 'warehouseId',
'supplierId', 'datetime',
'companyId', 'assigneeId', 'status', 'docType'])
where req contains a request
something like this
{
'docType': 3,
'status': 1,
'companyId': '2',
'warehouseId': '3',
'assigneeId': '5',
'supplierId': '12671',
'responsibleId': '5',
'datetime': '2020-04-01 08:01:00',
'comment': ''
}
As you can see there is a print which assures me that I selected the correct row
when I noticed that these records are not updated I searched for causes and found
this question where the guy who asked says The message field was missing from the model definition
in my case, none of these are missing from the model's description
class ProcurementDocJournal(models.Model):
id = models.IntegerField(primary_key=True, null=False)
docNumber = models.IntegerField()
status = models.IntegerField()
docType = models.IntegerField()
depended = models.IntegerField()
companyId = models.ForeignKey(Company, on_delete=models.CASCADE,
db_column='companyId')
created_at = models.DateTimeField(auto_now_add=True)
datetime = models.DateTimeField()
currencyId = models.ForeignKey(Currency, db_column='currencyId', on_delete=models.CASCADE)
currencyRate = models.FloatField()
redistributionMethod = models.IntegerField()
assigneeId = models.ForeignKey(User, on_delete=models.CASCADE, related_name='ProcurementDocJournal',
db_column='assigneeId')
warehouseId = models.ForeignKey(Warehouse, on_delete=models.CASCADE,
db_column='warehouseId')
responsibleId = models.ForeignKey(User, on_delete=models.CASCADE, related_name='ProcurementDoc',
db_column='responsibleId')
supplierId = models.ForeignKey(Partner, on_delete=models.CASCADE,
db_column='supplierId')
amount = models.FloatField()
comment = models.TextField()
class Meta:
db_table = 'procurementDocJournal'
get_latest_by = 'id'
Edit
I have an action that contains
procurement_doc_journal_item = ProcurementDocJournal.objects.get(id=pk)
currencyId = req['currency']
currency = Currency.objects.get(id=currencyId)
currencyRate = CurrencyRate(date, currency.name)
procurement_doc_journal_item.currencyId = currency
procurement_doc_journal_item.currencyRate = currencyRate['rate']
procurement_doc_journal_item.save()
and works like a charm
there is no any error that logs say

Answer 1

You don't specify if there's any error in your logs. I'd kind of expect to see something since if it's not saving, it must be bombing out before that as no fields are mandatory.
I am, however, not sure you're setting your FKs correctly here:
procurement_doc.companyId = Company(req['companyId'])
Should be
procurement_doc.companyId = Company.objects.get(pk=req['companyId'])
and that assumes companyId is set to a value that exists of course ... Whether this is the source of your issue or not, I'm not sure. I don't see any of your FKs are mandatory.
Edit: I've just tested this on one of my models with a simple id key:
>>> Contact(1)
Contact()
>>> c = Contact(1)
>>> c.name
''
>>> c = Contact.objects.get(pk=1)
>>> c.name
'Mike'
It really doesn't seem to me as though it works ...
Sidenote: You can simplify code like this:
if 'allCost' not in req.keys():
amount = 0
else:
amount = req['allCost']
By doing:
amount = req.get('allCost', 0)