Update AllowedMimeTypes.php

Author: Lithalroden

Diff for: src/Media/AllowedMimeTypes.php

@@ -134,6 +134,22 @@ public static function getValidationRule(string $type, bool $as_array = false, ?
         return $as_array ? $rules : implode('|', $rules);
     }
 
+    /**
+     * Get the validation rule for the given type of attachment
+     *
+     * @param string|null $type
+     * @return array
+     */
+    public static function getAttachmentValidationRule(string $type = null): array
+    {
+        $rules = [
+            'nullable',
+            Rule::exists('media', 'id')->whereIn('mime_type', AllowedMimeTypes::getAllowedMimeTypes($type)),
+        ];
+
+        return $rules;
+    }
+
     /**
      * Get the type from the mime type
      * @param string $mime_type