Seperate Document Import/Export files into Invoice/Bill

app/Exports/Sales/Sheets/InvoiceItems.php

@@ -0,0 +1,46 @@
+<?php
+
+namespace App\Exports\Sales\Sheets;
+
+use App\Abstracts\Export;
+use App\Models\Document\DocumentItem as Model;
+
+class InvoiceItems extends Export
+{
+    public function collection()
+    {
+        $model = Model::invoice()->with('document', 'item')->usingSearchString(request('search'));
+
+        if (!empty($this->ids)) {
+            $model->whereIn('document_id', (array) $this->ids);
+        }
+
+        return $model->cursor();
+    }
+
+    public function map($model): array
+    {
+        $document = $model->document;
+
+        if (empty($document)) {
+            return [];
+        }
+
+        $model->invoice_number = $document->document_number;
+        $model->item_name = $model->item->name;
+
+        return parent::map($model);
+    }
+
+    public function fields(): array
+    {
+        return [
+            'invoice_number',
+            'item_name',
+            'quantity',
+            'price',
+            'total',
+            'tax',
+        ];
+    }
+}