python - Django: use model_formfactory with @property model field

Question

I have this Django model:

# models.py
class MyModel(models.model):
    _foo = models.CharField(max_length=200)
    foo_link = models.Charfield(max_length=250)
    
    @property
    def foo(self):
        return self._foo
    
    @foo.setter
    def foo(self, value):
        self._foo = value
        self.foo_link = "https://foobar.com/{}".format(value)

I want foo to be a property, so that foo_link changes accordingly whenever I change it.

So far, this works as expected and as described in tutorials such as this one.

Except when I try to use modelform_factory with this property:

# views.py
from django.forms import modelform_factory

def edit_foo(request, foo_id):
    mymodel = get_object_or_404(MyModel, pk=foo_id)
    FooForm = modelform_factory(MyModel, fields=("foo",))
    if request.method == "POST":
        form = FooForm(request.POST, instance=mymodel)
        if form.is_valid():
            form.save()
    else:
        form = FooForm(instance=mymodel)
    
    return render(request, "myapp/editfoo.html", {"form": form})

It fails with the error django.core.exceptions.FieldError: Unknown field(s) (foo) specified for MyModel.

What did I do wrong here?

question from:https://stackoverflow.com/questions/65643910/django-use-model-formfactory-with-property-model-field

Answer 1

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