diff --git a/src/Models/Permission.php b/src/Models/Permission.php
index ad7e756..cf8b5cf 100755
--- a/src/Models/Permission.php
+++ b/src/Models/Permission.php
@@ -53,9 +53,9 @@ public function refreshCache(): void
      * @param bool $throw
      * @return array
      */
-    public function getIds(array $names, bool $throw = false): array
+    public static function getIds(array $names, bool $throw = false): array
     {
-        $items = $this->query()
+        $items = static::query()
             ->whereIn('name', $names)
             ->get(['id', 'name']);
 
diff --git a/src/Models/Role.php b/src/Models/Role.php
index 83c8906..2a6acf2 100755
--- a/src/Models/Role.php
+++ b/src/Models/Role.php
@@ -63,9 +63,9 @@ public function refreshCacheOnDelete(): void
      * @param bool $throw
      * @return array
      */
-    public function getIds(array $names, bool $throw = false): array
+    public static function getIds(array $names, bool $throw = false): array
     {
-        $items = $this->query()
+        $items = static::query()
             ->whereIn('name', $names)
             ->get(['id', 'name']);