Created
April 12, 2020 06:04
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MPTT admin to move multiple nodes at once
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| class PlaceAdmin(MPTTModelAdmin): | |
| def get_model_info(self): | |
| app_label = self.model._meta.app_label | |
| return app_label, self.model._meta.model_name | |
| def get_move_form_class(self): | |
| class MoveSelectTargetForm(forms.Form): | |
| target = forms.ModelChoiceField(self.model.objects.all()) | |
| position = TreeNodePositionField() | |
| object_ids = forms.CharField(max_length=1000) | |
| return MoveSelectTargetForm | |
| def move_selected_objects(self, request, queryset): | |
| selected = queryset.values_list('pk', flat=True) | |
| info = self.get_model_info() | |
| url = reverse(f'admin:%s_%s_move_select_target' % info) | |
| return HttpResponseRedirect('%s?ids=%s' % ( | |
| url, | |
| ','.join(str(pk) for pk in selected), | |
| )) | |
| actions = [ | |
| 'move_selected_objects', | |
| ] | |
| def move_select_target(self, request): | |
| form = self.get_move_form_class()() | |
| form.initial['object_ids'] = request.GET.get('ids') | |
| info = self.get_model_info() | |
| action = reverse(f'admin:%s_%s_move_process' % info) | |
| selection_ids = request.GET.get('ids').split(',') | |
| selection = self.model.objects.filter(id__in=selection_ids) | |
| context = { | |
| **self.admin_site.each_context(request), | |
| 'form': form, | |
| 'action': action, | |
| 'selection': selection, | |
| 'opts': self.model._meta, | |
| } | |
| return TemplateResponse(request, 'mptt_move/move_select_target.html', context) | |
| def move_process(self, request): | |
| url = reverse('admin:%s_%s_changelist' % self.get_model_info(), | |
| current_app=self.admin_site.name) | |
| response = HttpResponseRedirect(url) | |
| form = self.get_move_form_class()(request.POST) | |
| if not form.is_valid(): | |
| # need something proper here | |
| self.message_user(request, 'Invalid submission') | |
| return response | |
| else: | |
| ids = form.cleaned_data['object_ids'].split(',') | |
| for obj in self.model.objects.filter(id__in=ids): | |
| payload = { | |
| 'target': form.cleaned_data['target'], | |
| 'position': form.cleaned_data['position'] | |
| } | |
| move_form = MoveNodeForm(obj, payload) | |
| if not move_form.is_valid(): | |
| self.message_user(request, f'Invalid move operation: {form.errors}', level=messages.ERROR) | |
| continue | |
| else: | |
| with transaction.atomic(): | |
| move_form.save() | |
| with transaction.atomic(): | |
| self.model.objects.rebuild() | |
| self.message_user(request, 'Move instruction processed, tree rebuilt.') | |
| return response | |
| def get_urls(self): | |
| urls = super().get_urls() | |
| info = self.get_model_info() | |
| my_urls = [ | |
| path('move-select-target/', | |
| self.admin_site.admin_view(self.move_select_target), | |
| name='%s_%s_move_select_target' % info), | |
| path('move-process/', | |
| self.admin_site.admin_view(self.move_process), | |
| name='%s_%s_move_process' % info), | |
| ] | |
| return my_urls + urls |
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