Django: using ModelForm to edit existing database entry

Question

I have created a ModelForm class to be able to create and edit database entries. Creating new entries works well, however, i dont know how to use ModelForms to edit/update a

Answer 1

Remember you still need to use the instance parameter when you instantiate on POST.

instance = MyModel.objects.get(whatever)
if request.method == "POST":
    form = MyModelForm(request.POST, instance=instance)
    ...

else:
    form = MyModelForm(instance=instance)

Answer 2

Also possible and slightly shorter:

instance = MyModel.objects.get(whatever)
form = MyModelForm(request.POST or None, instance=instance)
...