How to stop an action on certain conditions with ->before()

What is the best practice in Filament to stop an action from continuing before it runs into a exception? For example I want to show a message to the user if delete is not possible because the category is used for items:

                    DeleteAction::make('delete')
                        ->before(function (TrendRadarTrendSegment $record) {
                            if ($record->radarTrends()->count() > 0) {
                                Notification::make()
                                    ->title('Delete failed')
                                    ->body(__('This segment is used by trends and cannot be deleted. Please move the trends to another segment first.'))
                                    ->danger()
                                    ->send();
                            }
                        })

                    DeleteAction::make('delete')
                        ->before(function (TrendRadarTrendSegment $record) {
                            if ($record->radarTrends()->count() > 0) {
                                Notification::make()
                                    ->title('Delete failed')
                                    ->body(__('This segment is used by trends and cannot be deleted. Please move the trends to another segment first.'))
                                    ->danger()
                                    ->send();
                            }
                        })

                    DeleteAction::make('delete')
                        ->before(function (TrendRadarTrendSegment $record) {
                            if ($record->radarTrends()->count() > 0) {
                                Notification::make()
                                    ->title('Delete failed')
                                    ->body(__('This segment is used by trends and cannot be deleted. Please move the trends to another segment first.'))
                                    ->danger()
                                    ->send();
                            }
                        })

                    DeleteAction::make('delete')
                        ->before(function (TrendRadarTrendSegment $record) {
                            if ($record->radarTrends()->count() > 0) {
                                Notification::make()
                                    ->title('Delete failed')
                                    ->body(__('This segment is used by trends and cannot be deleted. Please move the trends to another segment first.'))
                                    ->danger()
                                    ->send();
                            }
                        })

How can I break out of the DeleteAction in this case? Or is there another way to catch en exception and show a notification?

Yurii•10/4/23, 4:26 AM

@Sascha did you find a better way to handle exceptions from actions?
Currently, I have similar question. Your approach would work, however, it's only presentation level condition/restriction and I am wondering if it is possible to throw an exception on a model level (if any action is not allowed) and handle it correctly here.

@uwascan•10/4/23, 5:53 AM

you may use halt() / $this->halt(). It depends on your context (page or static). you may google more about it

Yurii•10/5/23, 4:18 AM

I am using Detach action on RelationManager. However, on a model level I am restricting the ability to detach for some cases.
If I throw an exception from the model and it just displays the expection page. My expectation was that it would show the exception message as a failure notification but I cannot find how to configure it in the way.

How to stop an action on certain conditions with ->before()

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