forms.ModelChoiceField Update view with defualt value - django-models

Question

I have Form ModelChoiceField from ForeignKey model
my Model is:
class Fielinfo(models.Model):
Perimeter = models.CharField(max_length=50,unique=True)
FidlAbr = models.CharField(max_length=15,unique=True)
and my second model :
class Wellinfo(models.Model):
WellID = models.CharField(max_length=15,unique=True)
Perimetre = models.ForeignKey(Fielinfo ,to_field='Perimeter', on_delete=models.CASCADE)
and my forms.py is:
class NewWells(forms.ModelForm):
Perimetre = forms.ModelChoiceField(queryset=Fielinfo.objects.all(),label='Perimetre', required=True)
the problem is When I need to update my view it doesn't gave me the initial value?
How do I solve this Please? (in the admin area it gave me the initial value).
my views.py is:
class PostUpadtW(UserPassesTestMixin, LoginRequiredMixin, UpdateView):
model = Wellinfo
template_name = 'Home/WELLINFO/Upd_W.html'
form_class = NewWells
def form_valid(self, form):
form.instance.author = self.request.user
return super().form_valid(form)
def test_func(self):
post = self.get_object()
if self.request.user== post.author:
return True
else:
return False

Answer 1

using ForeignKey is so complicated in Django so i solved it like this;
in models.py
class Fielinfo(models.Model):
Perimeter = models.CharField(max_length=50,unique=True)
FidlAbr = models.CharField(max_length=15,unique=True)
and I changed this
class Wellinfo(models.Model):
WellID = models.CharField(max_length=15,unique=True)
Perimetre = models.CharField(max_length=50)
and in my forms.py i did this :
class NewWells(forms.ModelForm):
TFTFields =Fielinfo.objects.all()[0:]
ListField= []
for fields in TFTFields:
ListField += [fields.Perimeter]
ChoiceItems= list(zip(ListField, ListField))
Perimetre = forms.ChoiceField(label='Perimetre',choices=ChoiceItems)