Making a custom id field in Django models - django

Question

I'm trying to make a model in Django that has a custom id attribute. I want it to always equal the sum of 10000 and the current id number of that instance. How exactly do I write that? And do I have to do anything in the view?
Edit: I better put the code I'm using just in case.
models.py
class Schedules(models.Model):
course_name = models.CharField(max_length=128, choices=COURSE_NAME_CHOICES, default='a-plus')
location = models.CharField(max_length=128, choices=LOCATION_CHOICES, default='south_plainfield')
room = models.CharField(max_length=128, choices=ROOM_CHOICES, default='A')
start_date = models.DateField(auto_now=False, auto_now_add=False, default=datetime.date.today)
start_time = models.CharField(max_length=128, choices=START_TIME_CHOICES, default='eight-thirty am')
end_time = models.CharField(max_length=128, choices=END_TIME_CHOICES, default='eight-thirty am')
instructor = models.CharField(max_length=128, choices=INSTRUCTOR_CHOICES, default='adewale')
total_hours = models.CharField(max_length=128, choices=TOTAL_HOURS_CHOICES, default='six')
hours_per_class = models.CharField(max_length=128, choices=HOURS_PER_CLASS_CHOICES, default='four_and_half')
frequency = models.CharField(max_length=128)
status = models.CharField(max_length=128, choices=STATUS_CHOICES)
interval = models.CharField(max_length=128, choices=INTERVAL_CHOICES, default='1 day')
initiated_by = models.CharField(max_length=128, null=True)
schedule_id = models.IntegerField(default=0)
views.py
def start_One_Schedule(request):
form = ScheduleForm()
if request.method == 'POST':
form = ScheduleForm(request.POST)
if form.is_valid():
obj = form.save(commit=False)
obj.initiated_by = request.user.username
obj.save()
return render(request, 'schedule/schedule.html', {})
else:
print(form.errors)
return render(request, 'schedule/start_one_schedule.html', {'form': form})

Answer 1

Create a property on the model that adds 10000 to the id field. You don't need to create the actual field.
class Example(models.Model):
#property
def custom_id(self):
return self.id + 10000

Answer 2

You can write custom id field in you model like this
class ABC(models.Model):
custom_id = models.IntegerField(default=0)
def save(self, flag=True, *args, **kwargs):
# Save your object. After this line, value of custom_id will be 0 which is default value
super(ABC, self).save(flag=True, *args, **kwargs)
# Here value of custom_id will be updated according to your id value
if flag:
self.custom_id = self.id + 10000
self.save(flag=False, *args, **kwargs)
flag is required as otherwise it will start recursion which will run infinitely.