Operation processes on invoices

app/Models/Invoice.php

@@ -3,6 +3,7 @@
 namespace App\Models;
 
 use App\Enumerations\InvoiceStatus;
+use App\Enumerations\InvoiceType;
 use App\Scopes\InstancedModel;
 use Illuminate\Database\Eloquent\Relations\BelongsTo;
 
@@ -75,4 +76,8 @@ class Invoice extends InstancedModel
     public function status() : BelongsTo {
         return $this->belongsTo(InvoiceStatus::class, 'status')->first();
     }
+
+    public function invoiceType() : InvoiceType {
+        return $this->belongsTo(InvoiceType::class, 'type', 'slug')->first();
+    }
 }