Replacement for django `render_options` - django

Question

So I am implementing this answer: Country/State/City dropdown menus inside the Django admin inline, but the def render piece of code needs to be redone.... I have managed to redo it, but I am struggling to find a replacement (or the correct code) for the self.render_options method (which was deprecated on 1.11) of the Widget class.
I am on Django 2.1.
What should I change?
Here is my code:
class StateChoiceWidget(widgets.Select):
def render(self, name, value, attrs=None, renderer=None):
self.choices = [(u"", u"---------")]
if value is None:
value = ''
model_obj = self.form_instance.instance
if model_obj and model_obj.country:
for m in model_obj.country.state_set.all():
self.choices.append((m.id, smart_text(m)))
else:
obj = State.objects.get(id=value)
for m in State.objects.filter(country=obj.country):
self.choices.append((m.id, smart_text(m)))
final_attrs = self.build_attrs(attrs)
output = ['<select%s>' % flatatt(final_attrs)]
for option in self.choices:
output.append('<option value="%s">%s</option>' % (option[0], option[1]))
output.append('</select>')
return mark_safe(''.join(output))
Original poster updated the sample code, so now it doesn't show the code in the question: see previous revision https://stackoverflow.com/revisions/52174508/1

Answer 1

So I figured out the answer. Will post it here in case someone runs into the same issue.
class StateChoiceWidget(widgets.Select):
def render(self, name, value, attrs=None, renderer=None):
self.choices = [(u"", u"---------")]
if value is None or value == '':
value = ''
model_obj = self.form_instance.instance
if model_obj and model_obj.country:
for m in model_obj.country.state_set.all():
self.choices.append((m.id, smart_text(m)))
else:
obj = State.objects.get(id=value)
for m in State.objects.filter(country=obj.country):
self.choices.append((m.id, smart_text(m)))
final_attrs = self.build_attrs(attrs)
s = widgets.Select(choices=self.choices)
select_html = s.render(name=name,value=value,attrs=attrs)
return mark_safe(''.join(select_html))