diff --git a/application/common/model/Attachment.php b/application/common/model/Attachment.php
index 79878c6..2149aec 100644
--- a/application/common/model/Attachment.php
+++ b/application/common/model/Attachment.php
@@ -21,4 +21,13 @@ class Attachment extends Model
         return strtotime($value);
     }
 
+    protected static function init()
+    {
+        // 如果已经上传该资源，则不再记录
+        self::beforeInsert(function ($model) {
+            if (self::where('url', '=', $model['url'])->find()) {
+                return false;
+            }
+        });
+    }
 }