Invoice Widgets completed

app/Models/CostUnit.php

@@ -4,6 +4,7 @@ namespace App\Models;
 
 use App\Scopes\InstancedModel;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 /**
  * @property string $name
@@ -37,4 +38,8 @@ class CostUnit extends InstancedModel
         $this->tresurers()->detach();
         $this->save();
     }
+
+    public function invoices() : hasMany {
+        return $this->hasMany(Invoice::class);
+    }
 }