Can get advanced information about a group

src/data/user.rs

@@ -12,6 +12,11 @@ impl UserID {
         UserID(id)
     }
 
+    /// Create a new invalid user id
+    pub fn invalid() -> UserID {
+        UserID(0)
+    }
+
     /// Get the current ID stored in this structure
     pub fn id(&self) -> u64 {
         self.0