From b88266ff123a5ec727a2887a7dca2a377aa9eb0f Mon Sep 17 00:00:00 2001
From: Mars Liu <mars.liu@outlook.com>
Date: Tue, 30 Nov 2021 19:44:00 +0800
Subject: [PATCH] fixed odd orders

---
 src/tree.py | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/tree.py b/src/tree.py
index 1a43375..692eff5 100644
--- a/src/tree.py
+++ b/src/tree.py
@@ -303,6 +303,9 @@ class TreeWalker:
         for e in config.get("export", []):
             full_name = os.path.join(section_path, e)
             exercise = load_json(full_name)
-            if "exercise_id" not in exercise:
-                exercise["exercise_id"] = uuid.uuid4().hex
+            if "exercise_id" not in exercise or exercise.get("exercise_id") in id_set:
+                eid = uuid.uuid4().hex
+                exercise["exercise_id"] = eid
                 dump_json(full_name, exercise, True, True)
+            else:
+                id_set.add(exercise["exercise_id"])
-- 
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