I want to fetch the transaction belonging to external_id=1 and has the highest timestamp.
I have tried this
max_rating = Transaction.objects.aggregate(organisation_id_from_partner=organisation_id, highest_timestamp=Max('timestamp'))
But I get TypeError: QuerySet.aggregate() received non-expression(s): 1.
Inside aggregate, you can only write Aggregate function. Try this
max_rating = Transaction.objects.filter(organisation_id_from_partner=organisation_id).order_by('-timestamp').first()
You can slightly shorten the answer by @shafik by using .latest(…) [Django-doc]:
max_rating = Transaction.objects.filter(
organisation_id_from_partner=organisation_id
).latest('timestamp')