ycb_django_pr14752

what a new run launched now would send

Refactor AutocompleteJsonView to support extra fields in autocomplete response
Description
	 
		(last modified by mrts)
	 
Adding data attributes to items in ordinary non-autocomplete foreign key fields that use forms.widgets.Select-based widgets is relatively easy. This enables powerful and dynamic admin site customizations where fields from related models are updated immediately when users change the selected item.
However, adding new attributes to autocomplete field results currently requires extending contrib.admin.views.autocomplete.AutocompleteJsonView and fully overriding the AutocompleteJsonView.get() method. Here's an example:
class MyModelAdmin(admin.ModelAdmin):
	def get_urls(self):
		return [
			path('autocomplete/', CustomAutocompleteJsonView.as_view(admin_site=self.admin_site))
			if url.pattern.match('autocomplete/')
			else url for url in super().get_urls()
		]
class CustomAutocompleteJsonView(AutocompleteJsonView):
	def get(self, request, *args, **kwargs):
		self.term, self.model_admin, self.source_field, to_field_name = self.process_request(request)
		if not self.has_perm(request):
			raise PermissionDenied
		self.object_list = self.get_queryset()
		context = self.get_context_data()
		return JsonResponse({
			'results': [
				{'id': str(getattr(obj, to_field_name)), 'text': str(obj), 'notes': obj.notes} # <-- customization here
				for obj in context['object_list']
			],
			'pagination': {'more': context['page_obj'].has_next()},
		})
The problem with this is that as AutocompleteJsonView.get() keeps evolving, there's quite a lot of maintenance overhead required to catch up.
The solutions is simple, side-effect- and risk-free: adding a result customization extension point to get() by moving the lines that construct the results inside JsonResponse constructor to a separate method. So instead of
		return JsonResponse({
			'results': [
				{'id': str(getattr(obj, to_field_name)), 'text': str(obj)}
				for obj in context['object_list']
			],
			'pagination': {'more': context['page_obj'].has_next()},
		})
there would be
		return JsonResponse({
			'results': [
				self.serialize_result(obj, to_field_name) for obj in context['object_list']
			],
			'pagination': {'more': context['page_obj'].has_next()},
		})
where serialize_result() contains the original object to dictionary conversion code that would be now easy to override:
def serialize_result(self, obj, to_field_name):
	return {'id': str(getattr(obj, to_field_name)), 'text': str(obj)}
The example CustomAutocompleteJsonView from above would now become succinct and maintainable:
class CustomAutocompleteJsonView(AutocompleteJsonView):
	def serialize_result(self, obj, to_field_name):
		return super.serialize_result(obj, to_field_name) | {'notes': obj.notes}
What do you think, is this acceptable? I'm more than happy to provide the patch.

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