Django how to use a ModelChoiceField in a formset_factory - django

Question

I am trying to use a modelchoicefield from the form in a formset_factory but i dont understand the error and don't know how to solve it.
(edit added the models.py)
models.py
class Order(Model):
user = ForeignKey(User, on_delete=SET_NULL, null=True)
fee = ForeignKey(Fee, on_delete=SET_NULL, null=True)
route = ForeignKey(Route, on_delete=SET_NULL, null=True)
price_rate = ForeignKey(PriceRate, on_delete=SET_NULL, null=True)
pallet_amount = IntegerField()
status = BooleanField()
postal_code = CharField(max_length=6)
city = CharField(max_length=255)
street = CharField(max_length=255)
delivery_from = DateTimeField()
delivery_until = DateTimeField(null=True)
created_at = DateTimeField(auto_now_add=True, blank=True)
updated_at = DateTimeField(auto_now=True)
deleted_at = DateTimeField(null=True, blank=True)
views.py
def routecreate_view(request):
orderformset = formset_factory(OrdersRouteForm, can_delete=False, extra=1)
if request.method == 'POST':
form = RouteForm(request.POST)
formset = orderformset(request.POST)
if form.is_valid() and formset.is_valid():
# process the data in form.cleaned_data as required
messages.success(request,
"You succesfully created an route.")
return HttpResponseRedirect(reverse('planner.dashboard'))
else:
form = RouteForm()
formset = orderformset()
return render(request, 'planner/route.html', {'form': form, 'formset': formset})
forms.py
class OrdersRouteForm(forms.ModelForm):
route = ModelChoiceField(
queryset=Order.objects.filter(status=1, delivery_until__gte=datetime.datetime.now(), deleted_at=None),
label='Order')
class Meta:
model = Order
fields = ("route",)
def __init__(self, *args, **kwargs):
super(OrdersRouteForm, self).__init__(*args, **kwargs)
for visible in self.visible_fields():
visible.field.widget.attrs['class'] = 'form-control m-2'
self.fields['route'].label_from_instance = self.label_from_instance
#staticmethod
def label_from_instance(obj):
return "pallets: %s, %s, %s, %s" % (obj.pallet_amount, obj.street, obj.city, obj.postal_code)
template:
{% extends 'base.html' %}
{% block base %}
<div class="container rounded bg-white mt-5 mb-5">
<div class="row">
<div class="col-md-5 border-right mx-auto">
planner//route
<div class="p-3 py-5">
<form id="form-container" method="POST">
{% csrf_token %}
{{ form }}
{{ formset }}
<button id="add-form" type="button">Add Another Bird</button>
<button class="btn btn-danger profile-button mt-3" onclick="window.history.back()">Cancel
</button>
<button class="btn btn-primary float-end mt-3" type="submit">Order</button>
</form>
</div>
</div>
</div>
</div>
{% endblock %}
error:
Cannot assign "<Order: Order object (2)>": "Order.route" must be a "Route" instance.
The error occurs when i fill the formset with request.POST and then try to send the formset to the template.
I have tried an inlineformset and modelformset and didnt get it to work. ANY solution is welcome.

Answer 1

The problem seemed to be with the modelform. I removed this from the code:
class Meta:
model = Order
fields = ("route",)
I don't understand why this caused the problem and if anyone knows and can explain it please feel free to do so.
hope it helps anyone else with this problem.