Added/refactorerd isDeletable()

Signed-off-by: snipe <snipe@snipe.net>

app/Models/AssetModel.php

@@ -6,6 +6,7 @@ use App\Models\Traits\Searchable;
 use App\Presenters\Presentable;
 use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\SoftDeletes;
+use Illuminate\Support\Facades\Gate;
 use Illuminate\Support\Facades\Storage;
 use Watson\Validating\ValidatingTrait;
 
@@ -188,6 +189,21 @@ class AssetModel extends SnipeModel
         return false;
     }
 
+
+    /**
+     * Checks if the model is deletable
+     *
+     * @author A. Gianotto <snipe@snipe.net>
+     * @since [v6.3.4]
+     * @return bool
+     */
+    public function isDeletable()
+    {
+        return Gate::allows('delete', $this)
+            && ($this->assets_count == 0)
+            && ($this->deleted_at == '');
+    }
+
     /**
      * Get uploads for this model
      *