Fix more bugs

src/data_provider/word_groups.rs

@@ -19,7 +19,7 @@ impl TableAccessQuerySet<WordGroup> for WordGroupQuerySet {
     }
 
     fn add() -> &'static str {
-        "INSERT INTO word_groups (name) VALUES (?1)"
+        "INSERT INTO word_groups (name) VALUES (?1) RETURNING id"
     }
 
     fn name() -> &'static str {