Django: forms.MultipleChoiceField does not display - postgresql

Question

I'm new to Django/Python. I have a problem with djangos MultipleChoiceField in that it does not display both in the loaded HTML code in the browser and on the displayed page. Other aspects of the form have been successfully rendered.
models.py
SERVICE_A = "1"
SERVICE_B = "2"
SERVICE_CHOICE =(
(SERVICE_A, "Internet"),
(SERVICE_B, "Television"),
)
class Contract(models.Model):
priority_service = ChoiceArrayField(models.CharField(max_length=15, choices=SERVICE_CHOICE), default=list)
forms.py
class ContractCreateForm(forms.ModelForm):
priority_service = forms.MultipleChoiceField(widget=forms.CheckboxSelectMultiple, choices=SERVICE_CHOICE)
class Meta:
model = Contract
widgets = {
"name": rows(TextFormControl(), 1),
"city": TextFormControl(),
"address": TextFormControl(),
"phone": TextFormControl(),
"from_office": CheckBoxFormControl(),
}
fields = widgets.keys()
views.py
def contract_new(request):
form = ContractCreateForm()
if request.method == "POST":
form = ContractCreateForm(request.POST)
if form.is_valid():
contract = form.save(commit=False)
priority_service = form.cleaned_data.get('priority_service')
contract.created_by = request.user
contract.status = STATUS_NONE
contract.save()
messages.add_message(request, messages.SUCCESS, f"Успешно создано под номером #{contract.id}")
form = ContractCreateForm() # reset form
return render(request, "register_contract.html", {"form": form})
The problem is that I can't display the option with the "name", contract.get_priority_service_display - does not transmit any result. Although if I just output contract.priority_service, it will pass the string: "1" "2".
There were also attempts to check at the stage of selecting information from the form via get in views.py :
print(priority_service) - it also outputs ['1', '2']. But for some reason I can't pick up the name (inet, tv).
Although many other fields (Standard) are displayed normally.