MDL-36941 core: added 'convhash' field to quickly get conversations

2018-03-23 12:30:28 +08:00
parent 0d51ae7ef3
commit b2cd17e6a9
9 changed files with 65 additions and 42 deletions
@@ -293,6 +293,18 @@ class helper {
        return $params;
    }

+    /**
+     * Returns the conversation hash between users for easy look-ups in the DB.
+     *
+     * @param array $userids
+     * @return string
+     */
+    public static function get_conversation_hash(array $userids) {
+        sort($userids);
+
+        return sha1(implode('-', $userids));
+    }
+
    /**
     * Returns the cache key for the time created value of the last message between two users.
     *