Fixing belong to relation

src/Http/Controllers/ImportController.php

@@ -13,6 +13,7 @@
 use Laravel\Nova\Actions\ActionResource;
 use Laravel\Nova\Http\Requests\NovaRequest;
 use Maatwebsite\Excel\Concerns\ToModel as ModelImporter;
+use SimonHamp\LaravelNovaCsvImport\Http\Requests\ImportNovaRequest;
 
 class ImportController
 {
@@ -27,7 +28,7 @@ public function __construct(ModelImporter $importer, Filesystem $filesystem)
         $this->filesystem = $filesystem;
     }
 
-    public function configure(NovaRequest $request, string $file): Response
+    public function configure(ImportNovaRequest $request, string $file): Response
     {
         $file_name = pathinfo($file, PATHINFO_FILENAME);
 
@@ -127,7 +128,7 @@ public function preview(NovaRequest $request, string $file): Response
         );
     }
 
-    public function import(NovaRequest $request)
+    public function import(ImportNovaRequest $request)
     {
         $file = $request->input('file');
 
@@ -140,6 +141,8 @@ public function import(NovaRequest $request)
         $resource_name = $config['resource'];
 
         $resource = Nova::resourceInstanceForKey($resource_name);
+
+        $request->setImportResource(get_class($resource));
         $rules = $this->extractValidationRules($resource, $request)->toArray();
         $model_class = $resource->resource::class;
 
@@ -195,7 +198,7 @@ public function review(NovaRequest $request, string $file): Response
         );
     }
 
-    protected function getAvailableFieldsForImport(string $resource, NovaRequest $request): array
+    protected function getAvailableFieldsForImport(string $resource, ImportNovaRequest $request): array
     {
         $novaResource = new $resource(new $resource::$model);
         $fieldsCollection = collect($novaResource->creationFields($request));
@@ -207,6 +210,8 @@ protected function getAvailableFieldsForImport(string $resource, NovaRequest $re
         }
 
         $fields = $fieldsCollection->map(function (Field $field) use ($novaResource, $request) {
+            $request->setImportResource($novaResource);
+
             return [
                 'name' => $field->name,
                 'attribute' => $field->attribute,

src/Http/Requests/ImportNovaRequest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace SimonHamp\LaravelNovaCsvImport\Http\Requests;
+
+use Laravel\Nova\Http\Requests\NovaRequest;
+
+class ImportNovaRequest extends NovaRequest
+{
+    /**
+     * @var
+     */
+    protected $importResource;
+
+    /**
+     * @param mixed $resource
+     */
+    public function setImportResource($resource): self
+    {
+        $this->importResource = $resource;
+
+        return $this;
+    }
+
+    /**
+     * Get the class name of the resource being requested.
+     *
+     * @return class-string<\Laravel\Nova\Resource>
+     *
+     * @throws \Symfony\Component\HttpKernel\Exception\NotFoundHttpException
+     */
+    public function resource()
+    {
+        return tap(once(function () {
+            return $this->importResource;
+        }), function ($resource) {
+            abort_if(is_null($resource), 404);
+        });
+    }
+}