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app/Filament/User/Resources/SpiceSupplierResource/Pages/CreateSpiceSupplier.php

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+<?php
+
+namespace App\Filament\User\Resources\SpiceSupplierResource\Pages;
+
+use App\Filament\User\Resources\SpiceSupplierResource;
+use Filament\Resources\Pages\CreateRecord;
+use Illuminate\Database\Eloquent\Model;
+use App\Models\Spice;
+
+class CreateSpiceSupplier extends CreateRecord
+{
+    protected static string $resource = SpiceSupplierResource::class;
+
+    protected function handleRecordCreation(array $data): Model {
+        $record = static::getModel()::create($data);
+
+        Spice::findOrFail($data['spice_id'])->increment('quantity', $data['amount']);
+        return $record;
+    }
+}

app/Filament/User/Resources/SpiceSupplierResource/Pages/EditSpiceSupplier.php

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+<?php
+
+namespace App\Filament\User\Resources\SpiceSupplierResource\Pages;
+
+use App\Filament\User\Resources\SpiceSupplierResource;
+use Filament\Resources\Pages\EditRecord;
+use Filament\Notifications\Notification;
+use App\Models\Spice;
+
+class EditSpiceSupplier extends EditRecord
+{
+    protected static string $resource = SpiceSupplierResource::class;
+
+    
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            \Filament\Actions\DeleteAction::make()->before(function ($record) {
+                if (!$record->spice || $record->spice->quantity < $record->amount) {
+                    Notification::make()
+                        ->warning()
+                        ->title('Fehler!')
+                        ->body('Nicht mehr genügend ' . htmlentities($record->spice->name) . ' im Lager (bräuchte mindestens Liefermenge um Lieferung rückgängig zu machen)')
+                        ->send();
+                    $this->halt();
+                    return false;
+                }
+                Spice::findOrFail($record->spice->id)->decrement('quantity', $record->amount);
+            }),
+        ];
+    }
+}

app/Filament/User/Resources/SpiceSupplierResource/Pages/ListSpiceSuppliers.php

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+<?php
+
+namespace App\Filament\User\Resources\SpiceSupplierResource\Pages;
+
+use App\Filament\User\Resources\SpiceSupplierResource;
+use Filament\Actions;
+use Filament\Resources\Pages\ListRecords;
+
+class ListSpiceSuppliers extends ListRecords
+{
+    protected static string $resource = SpiceSupplierResource::class;
+
+    protected function getHeaderActions(): array
+    {
+        return [
+            Actions\CreateAction::make(),
+        ];
+    }
+}