human friendly invoice import/export

app/Exports/Sales/Sheets/Invoices.php

@@ -9,7 +9,7 @@ class Invoices extends Export
 {
     public function collection()
     {
-        $model = Model::usingSearchString(request('search'));
+        $model = Model::with(['category'])->usingSearchString(request('search'));
 
         if (!empty($this->ids)) {
             $model->whereIn('id', (array) $this->ids);
@@ -18,6 +18,13 @@ class Invoices extends Export
         return $model->get();
     }
 
+    public function map($model): array
+    {
+        $model->category_name = $model->category->name;
+
+        return parent::map($model);
+    }
+
     public function fields(): array
     {
         return [
@@ -29,8 +36,7 @@ class Invoices extends Export
             'amount',
             'currency_code',
             'currency_rate',
-            'category_id',
-            'contact_id',
+            'category_name',
             'contact_name',
             'contact_email',
             'contact_tax_number',