#32993: Refactor AutocompleteJsonView to support extra fields in autocomplete response -------------------------------------+------------------------------------- Reporter: mrts | Owner: nobody Type: | Status: new Cleanup/optimization | Component: contrib.admin | Version: 3.2 Severity: Normal | Resolution: Keywords: | Triage Stage: | Unreviewed Has patch: 0 | Needs documentation: 0 Needs tests: 0 | Patch needs improvement: 0 Easy pickings: 1 | UI/UX: 0 -------------------------------------+------------------------------------- Description changed by mrts:
Old description: > 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: > > {{{#!python > 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}}} to a separate method. So > instead of > > {{{#!python > 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 > > {{{#!python > return JsonResponse({ > 'results': [ > self.obj_to_dict(obj, to_field_name) for obj in > context['object_list'] > ], > 'pagination': {'more': context['page_obj'].has_next()}, > }) > }}} > > where {{{obj_to_dict()}}} contains the original object to dictionary > conversion code that would be now easy to override: > > {{{#!python > def obj_to_dict(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: > > {{{#!python > class CustomAutocompleteJsonView(AutocompleteJsonView): > > def obj_to_dict(self, obj, to_field_name): > return super.obj_to_dict(obj, to_field_name) | {'notes': > obj.notes} > }}} > > What do you think, is this acceptable? I'm more than happy to provide the > patch. New description: 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: {{{#!python 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 {{{#!python 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 {{{#!python return JsonResponse({ 'results': [ self.obj_to_dict(obj, to_field_name) for obj in context['object_list'] ], 'pagination': {'more': context['page_obj'].has_next()}, }) }}} where {{{obj_to_dict()}}} contains the original object to dictionary conversion code that would be now easy to override: {{{#!python def obj_to_dict(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: {{{#!python class CustomAutocompleteJsonView(AutocompleteJsonView): def obj_to_dict(self, obj, to_field_name): return super.obj_to_dict(obj, to_field_name) | {'notes': obj.notes} }}} What do you think, is this acceptable? I'm more than happy to provide the patch. -- -- Ticket URL: <https://code.djangoproject.com/ticket/32993#comment:1> Django <https://code.djangoproject.com/> The Web framework for perfectionists with deadlines. -- You received this message because you are subscribed to the Google Groups "Django updates" group. To unsubscribe from this group and stop receiving emails from it, send an email to django-updates+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/django-updates/062.e85323c2fa1626013ac12aeca303cfc2%40djangoproject.com.