perf: /contest/预先查询answer_set

这样初次访问`/contest/`时可以减少20次SQL（51 → 31）。
BITNP · Aug 25, 2024 · ac6247a · ac6247a
1 parent ddeb964
commit ac6247a
Show file tree

Hide file tree

Showing 2 changed files with 3 additions and 1 deletion.
diff --git a/contest/quiz/templates/contest.html b/contest/quiz/templates/contest.html
@@ -39,7 +39,7 @@
     <article class="mx-auto max-w-2xl pb-6 prose">
       <form action="{% url 'quiz:contest_submit' %}" method="post">
         {% csrf_token %}
-        {% for a in draft_response.answer_set.all %}
+        {% for a in answer_set.all %}
           <fieldset class="my-4 p-4 sm:px-6 lg:px-8 bg-white shadow disabled:text-gray-400"
                     {% if draft_response.outdated %}disabled{% endif %}>
             <p class="text-lg my-0">

diff --git a/contest/quiz/views.py b/contest/quiz/views.py
@@ -231,6 +231,8 @@ def contest(request: AuthenticatedHttpRequest) -> HttpResponse:
         "contest.html",
         {
             "draft_response": draft_response,
+            # 为渲染模板预先从数据库查询相关内容
+            "answer_set": draft_response.answer_set.select_related('question', 'choice'),
             "constants": constants,
         },
     )