{"id":25148,"date":"2026-08-27T16:00:58","date_gmt":"2026-08-27T07:00:58","guid":{"rendered":"https:\/\/www.ecomottblog.com\/?p=25148"},"modified":"2026-08-27T13:43:08","modified_gmt":"2026-08-27T04:43:08","slug":"django%e3%81%aen1%e5%95%8f%e9%a1%8c%e3%81%afpytest%e3%81%a7%e6%a4%9c%e7%9f%a5%e3%81%97%e3%82%88%e3%81%86","status":"publish","type":"post","link":"https:\/\/www.ecomottblog.com\/?p=25148","title":{"rendered":"Django\u306eN+1\u554f\u984c\u306fpytest\u3067\u691c\u77e5\u3057\u3088\u3046"},"content":{"rendered":"
\u3053\u3093\u306b\u3061\u306f\uff01
\u30c7\u30d0\u30a4\u30b9\u30bd\u30d5\u30c8\u30a6\u30a8\u30a2\u958b\u767a\u90e8\u306e\u7c73\u68ee\u3067\u3059\u3002 \n\n \u62c5\u5f53\u3057\u3066\u3044\u308b\u6848\u4ef6\u3067\u3001Web\u30a2\u30d7\u30ea\u958b\u767a\u306bDjango\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002<\/div>\n\n
 <\/div>\n\n
\n\n Django\u306fPython\u306e\u300cbatteries included<\/a>\u300d\u3068\u3044\u3046\u601d\u60f3\u3092\u8e0f\u8972\u3057\u3066\u304a\u308a\u3001\u300c\u30d0\u30c3\u30c6\u30ea\u30fc\u540c\u68b1\u306a\u306e\u3067\u3001\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u4f5c\u696d\u7121\u3057\u3067\u3059\u3050\u306b\u8272\u3005\u306a\u4fbf\u5229\u6a5f\u80fd\u304c\u4f7f\u3048\u308b\u300d\u3068\u3044\u3046\u8003\u3048\u3092\u30e2\u30c3\u30c8\u30fc\u306e1\u3064\u3068\u3057\u3066\u63b2\u3052\u3066\u3044\u307e\u3059\u3002<\/div>\n\n
 <\/div>\n\n
Web\u30a2\u30d7\u30ea\u958b\u767a\u306b\u5fc5\u8981\u306a\u6a5f\u80fd\u304c\u307b\u3068\u3093\u3069\u5168\u3066\u63c3\u3063\u3066\u3044\u308b\u3088\u3046\u306aDjango\u3067\u3059\u304c\u3001\u4e2d\u3067\u3082ORM\u304c\u975e\u5e38\u306b\u5f37\u529b\u3067\u3001SQL\u3092\u610f\u8b58\u3059\u308b\u3053\u3068\u306a\u304f\u9ad8\u901f\u306bWeb\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u69cb\u7bc9\u3067\u304d\u307e\u3059\u3002\u3057\u304b\u3057\u3001\u305d\u306e\u5f37\u529b\u306a\u62bd\u8c61\u5316\u306e\u88cf\u5074\u3067\u300c\u3044\u3064\u306e\u9593\u306b\u304b\u610f\u56f3\u305b\u306c\u30af\u30a8\u30ea\u304c\u767a\u884c\u3055\u308c\u3066\u3044\u305f\u300d\u3068\u3044\u3046\u6050\u6016\u3092\u5473\u308f\u3063\u305f\u3053\u3068\u304c\u3042\u308b\u30a8\u30f3\u30b8\u30cb\u30a2\u306f\u591a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/div>\n\n
 <\/div>\n\n
\n\n \u305d\u306e\u4ee3\u8868\u4f8b\u304c\u300cN+1\u554f\u984c\u300d\u3067\u3059\u3002<\/div>\n\n
 <\/div>\n\n
\u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u304c\u5c11\u306a\u3044\u958b\u767a\u74b0\u5883\u3067\u306f\u554f\u984c\u304c\u9855\u5728\u5316\u3059\u308b\u3053\u3068\u304c\u5c11\u306a\u3044\u306e\u3067\u3001\u52d5\u4f5c\u78ba\u8a8d\u306e\u76ee\u3092\u3059\u308a\u629c\u3051\u3001\u30ea\u30ea\u30fc\u30b9\u3055\u308c\u3066\u3057\u307e\u3046\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002<\/div>\n\n
 <\/div>\n\n
\n\n select_related<\/code>\u3084 prefetch_related<\/code>\u306a\u3069\u306e\u56de\u907f\u7b56\u304cDjango\u304b\u3089\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u3053\u308c\u3089\u304c\u9069\u5207\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3067\u78ba\u8a8d\u3059\u308b\u306e\u306b\u306f\u9650\u754c\u304c\u3042\u308a\u307e\u3059\u3002<\/div>\n\n
 <\/div>\n\n
\u306a\u306e\u3067\u3001\u4eca\u56de\u306fpytest<\/code>\u3092\u4f7f\u3063\u3066N+1\u554f\u984c\u3092\u6a5f\u68b0\u7684\u306b\u691c\u77e5\u3059\u308b\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002 \n\n\n

\u3053\u306e\u8a18\u4e8b\u3067\u89e6\u308c\u306a\u3044\u3053\u3068<\/h2>\n\n\n \u4ee5\u4e0b\u306f\u3053\u306e\u8a18\u4e8b\u3067\u306f\u89e6\u308c\u307e\u305b\u3093\u3002\u60f3\u5b9a\u8aad\u8005\u306f\u3001Django \/ DRF\u3001pytest\u3067\u306e\u57fa\u672c\u7684\u306a\u958b\u767a\u7d4c\u9a13\u304c\u3042\u308b\u65b9\u3067\u3059\u3002 \n\n\n
    \n
  • \n
      <\/ul>\n<\/li>\n<\/ul>\n
        \n
      • \n
          \n
        • Django\/DRF\u3092\u4f7f\u3063\u305fWEB\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u4f5c\u308a\u65b9<\/li>\n
        • pytest\u306e\u4f7f\u3044\u65b9<\/li>\n
        • Django\u3068pytest\u306e\u9023\u643a\u65b9\u6cd5<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n\n\n\n\n
           <\/div>\n

          \u524d\u63d0\uff1aN+1\u554f\u984c\u3068\u30c7\u30fc\u30bf\u69cb\u9020<\/h2>\nN+1\u554f\u984c\u3068\u306f\u3001\u4e00\u89a7\u53d6\u5f97\u306e\u305f\u3081\u306e\u30af\u30a8\u30ea1\u56de\u306b\u52a0\u3048\u3001\u5404\u30ec\u30b3\u30fc\u30c9\u306b\u7d10\u3065\u304f\u95a2\u9023\u30c7\u30fc\u30bf\u53d6\u5f97\u306e\u30af\u30a8\u30ea\u304c\u30ec\u30b3\u30fc\u30c9\u6570\u5206\uff08N\u56de\uff09\u767a\u884c\u3055\u308c\u308b\u3053\u3068\u3067\u3001\u7d50\u679c\u3068\u3057\u3066\u300cN+1\u56de\u300d\u306e\u30af\u30a8\u30ea\u304c\u5b9f\u884c\u3055\u308c\u3066\u3057\u307e\u3046\u554f\u984c\u3067\u3059\u3002\n \n\n\n<\/div>\n\n
          \u4ee5\u4e0b\u306e\u7c21\u6613\u7684\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u60f3\u5b9a\u3057\u307e\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n\n
          class User(models.Model):\n    name = models.CharField(max_length=50)\n\n    def __str__(self):\n        return self.name\n\nclass Post(models.Model):\n    author = models.ForeignKey(User, on_delete=models.CASCADE, related_name='posts')\n    title = models.CharField(max_length=100)\n    \n    def __str__(self):\n        return self.title<\/code><\/pre>\n\n\n<\/div>\n\n
           <\/div>\n\n
          Post\u30e2\u30c7\u30eb\u306fUser\u30e2\u30c7\u30eb\u306b\u7d10\u3065\u3044\u3066\u304a\u308a\u3001Post\u306e\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b\u969b\u306b\u3001\u5404Post\u306eauthor.name\u3092\u8868\u793a\u3059\u308b\u3088\u3046\u306a\u30b1\u30fc\u30b9\u3092\u4f8b\u306b\u8003\u3048\u307e\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n \u30ec\u30b9\u30dd\u30f3\u30b9\u30a4\u30e1\u30fc\u30b8\uff1a<\/div>\n\n
           <\/div>\n\n
          \n\n\n
          [\n    {\n        \"id\": 1,\n        \"title\": \"Post 1\",\n        \"author_name\": \"Alice\"\n    },\n    {\n        \"id\": 2,\n        \"title\": \"Post 2\",\n        \"author_name\": \"Bob\"\n    },\n    {\n        \"id\": 3,\n        \"title\": \"Post 3\",\n        \"author_name\": \"Charlie\"\n    }\n]<\/code><\/pre>\n\n\u4f8b\u3048\u3070\u3001Post 100\u4ef6\u3092\u53d6\u5f97\u3059\u308b\u969b\u3001Post\u4e00\u89a7\u306e\u53d6\u5f97\u306b1\u56de\u3001User\u60c5\u5831\u306e\u53d6\u5f97\u306b100\u56de\u3001\u5408\u8a08\u3067101\u56de\u306e\u30af\u30a8\u30ea\u304c\u5b9f\u884c\u3055\u308c\u306e\u304cN+1\u554f\u984c\u3067\u3059\u3002\n \n
          \n
          \n\u30c7\u30fc\u30bf\u91cf\u306e\u5897\u52a0\u306b\u4f34\u3044\u30af\u30a8\u30ea\u6570\u3082\u5897\u52a0\u3059\u308b\u305f\u3081\u3001\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u3067\u306f\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4f4e\u4e0b\u306e\u539f\u56e0\u3068\u306a\u308a\u307e\u3059\u3002\n<\/div>\n<\/div>\n
          \u307e\u305a\u306f\u554f\u984c\u306e\u518d\u73fe<\/h2>\n\u307e\u305a\u306f\u3001N+1\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u30b1\u30fc\u30b9\u3092\u5b9f\u969b\u306b\u518d\u73fe\u3057\u3066\u307f\u307e\u3059\u3002\n<\/div>\n\n
           <\/div>\n\n
          \n\n \u4e0a\u8ff0\u306emodel\u3092\u4f7f\u3063\u3066\u3001Post\u306e\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308bAPI\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n Post\u30e2\u30c7\u30eb\u306eModelSerializer<\/code>\u3092\u4f5c\u6210\u3057\u3001author.name<\/code>\u3092\u53d6\u5f97\u3059\u308b\u305f\u3081\u306b\u3001<\/div>\n\n
          serializers.ReadOnlyField(source='author.name')<\/code>\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n\n
          # serializers.py\n\nfrom rest_framework import serializers\nfrom .models import Post\n\nclass BadPostSerializer(serializers.ModelSerializer):\n    author_name = serializers.ReadOnlyField(source='author.name') # !!! \u95a2\u9023\u30c6\u30fc\u30d6\u30eb\u30a2\u30af\u30bb\u30b9\n\n    class Meta:\n        model = Post\n        fields = ('id', 'title', 'author_name')<\/code><\/pre>\n\n\n<\/div>\n\n
           <\/div>\n\n
          views.py\u3067\u306f\u3001Post\u306e\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b\u969b\u306bPost.objects.all()<\/code>\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u95a2\u9023\u30c6\u30fc\u30d6\u30eb\u3067\u3042\u308bUser\u3078\u306f\u4e8b\u524d\u306b\u30a2\u30af\u30bb\u30b9\u305b\u305a\u3001\u5404Post\u3054\u3068\u306bUser\u3078\u306e\u30af\u30a8\u30ea\u304c\u767a\u751f\u3059\u308b\u3088\u3046\u306a\u66f8\u304d\u65b9\u3092\u3057\u307e\u3059\u3002 \n\n\n
          # views.py\n\nfrom rest_framework import status\nfrom rest_framework.response import Response\nfrom rest_framework.views import APIView\n\nfrom .models import Post\nfrom .serializers import BadPostSerializer\n\n\nclass BadPostListAPIView(APIView):\n    def get(self, request):\n        posts = Post.objects.all() # !!! N+1\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u66f8\u304d\u65b9\n        serializer = BadPostSerializer(posts, many=True)\n        data = serializer.data\n        return Response(data, status=status.HTTP_200_OK)<\/code><\/pre>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u3082\u306e\u3067\u3001Post\u4e00\u89a7\u306f10\u4ef6\u306e\u30a8\u30f3\u30c8\u30ea\u3092\u8fd4\u3057\u307e\u3059\u3002 \n\n\n
          User(name=\"TestUser\")\n    \u251c Post(title=\"01\")\n    \u251c Post(title=\"02\")\n    \u251c ....\n    \u2514 Post(title=\"10\")<\/code><\/pre>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u305d\u306e\u4ed6\u3001URL\u30eb\u30fc\u30c6\u30a3\u30f3\u30b0\u306a\u3069\u3092\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3057\u3001API\u3092\u758e\u901a\u3055\u305b\u307e\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \u5b9f\u969b\u306b\u4e00\u89a7\u53d6\u5f97\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u30c7\u30fc\u30bf\u304c\u53d6\u5f97\u3067\u304d\u307e\u3057\u305f\u3002 \n\n\n
          \"\"<\/figure>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u60f3\u5b9a\u901a\u308a\u300110\u4ef6\u306ePost\u304c\u53d6\u5f97\u3055\u308c\u3001Post\u306b\u306fauthor.name<\/code>\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002 \n\n \u3067\u306f\u3001\u5185\u90e8\u7684\u306b\u3069\u306e\u3088\u3046\u306a\u30af\u30a8\u30ea\u304c\u767a\u884c\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3059\u3002 \n\n views.py\u306b\u30af\u30a8\u30ea\u60c5\u5831\u3092\u30d7\u30ea\u30f3\u30c8\u3057\u307e\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n\n
          # views.py\n\nclass BadPostListAPIView(APIView):\n    def get(self, request):\n        posts = Post.objects.all()\n        serializer = BadPostSerializer(posts, many=True)\n        data = serializer.data\n        ##### \u4ee5\u4e0b\u8ffd\u52a0\n        queries = connection.queries\n        query_count = len(queries)\n\n        print(\"n================ [ N+1 Demo Query Log ] ================\")\n        print(f\"Total Queries Executed: {query_count}\")\n        for i, q in enumerate(queries, 1):\n            print(f\"{i}. [{q['time']}s] {q['sql']}\")\n        print(\"========================================================n\")        \n        ##### \u8ffd\u52a0\u7d42\u308f\u308a\n        return Response(data, status=status.HTTP_200_OK)<\/code><\/pre>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u3053\u306e\u72b6\u614b\u3067API\u3092\u518d\u5ea6\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u30ed\u30b0\u304c\u5f97\u3089\u308c\u307e\u3057\u305f\u3002 \n\n\n
          \"\"<\/figure>\n\n\n<\/div>\n\n
           <\/div>\n\n
          Post\u4e00\u89a7\u3092\u53d6\u5f97\u3059\u308b\u306e\u306b1\u56de\u3001\u305d\u308c\u305e\u308c\u306ePost\u306eauthor.name<\/code>\u3092\u53d6\u5f97\u3059\u308b\u306e\u306b10\u56de\u3001\u5408\u8a0811\u56de\u306e\u30af\u30a8\u30ea\u304c\u767a\u884c\u3055\u308c\u3066\u3044\u308b\u3053\u3068\u304c\u308f\u304b\u308a\u307e\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n\n
          N+1\u554f\u984c\u3092pytest\u3067\u691c\u77e5\u3059\u308b<\/h2>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u4e0a\u8a18\u306e\u3088\u3046\u306a\u96a0\u308c\u305fN+1\u554f\u984c\u3092\u6a5f\u68b0\u7684\u306b\u691c\u77e5\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u305f\u3044\u3067\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n \u65b9\u6cd5\u306f\u8272\u3005\u3042\u308b\u3068\u601d\u3044\u307e\u3059\u304c\u3001\u4eca\u56de\u306fpytest-django<\/code>\u306edjango_assert_num_queries<\/code>\u3092\u4f7f\u3046\u65b9\u6cd5\u3092\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n pytest-django<\/code>\u306fDjango\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u5411\u3051\u306b\u4fbf\u5229\u306a\u30c6\u30b9\u30c8\u6a5f\u80fd\u3092\u63d0\u4f9b\u3057\u3066\u304f\u308c\u308bpytest\u306e\u30d7\u30e9\u30b0\u30a4\u30f3\u3067\u3001\u305d\u306e\u30d8\u30eb\u30d1\u30fc\u306e1\u3064\u306bdjango_assert_num_queries<\/code>()\u3068\u3044\u3046\u3082\u306e\u304c\u3042\u308a\u307e\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n \u53c2\u8003\uff1ahttps:\/\/pytest-django.readthedocs.io\/en\/latest\/helpers.html#django_assert_num_queries \n\n\n
          expected_query_num = 1\nwith django_assert_num_queries(expected_query_num):\n    # \u30c6\u30b9\u30c8\u5bfe\u8c61API\u306e\u5b9f\u884c\n    response = client.get(url)<\/code><\/pre>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u3053\u306e\u3088\u3046\u306b\u66f8\u304f\u3053\u3068\u3067\u3001\u30c6\u30b9\u30c8\u5bfe\u8c61\u306e\u51e6\u7406\u3067\u767a\u884c\u3055\u308c\u308b\u30af\u30a8\u30ea\u6570\u3092assert\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n \u3067\u306f\u5b9f\u969b\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u3092\u66f8\u3044\u3066\u3001\u30c6\u30b9\u30c8\u3092\u5b9f\u884c\u3057\u3066\u307f\u307e\u3059\u3002<\/div>\n\n
          \u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u304c3\u4ef6\u3042\u3063\u3066\u3082\u3001\u30af\u30a8\u30ea\u304c1\u56de\u306b\u53ce\u307e\u308b\u304b\u3092\u691c\u8a3c\u3059\u308b\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u3067\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n\n
          import pytest\nfrom django.urls import reverse\nfrom users.models import User, Post\n\n@pytest.mark.django_db\ndef test_bad_post_list_query_count(client, django_assert_num_queries):\n    ### Arrange\n    # \u30c6\u30b9\u30c8\u7528\u306e\u30c0\u30df\u30fc\u30c7\u30fc\u30bf\u3092\u4f5c\u6210 (User 1\u4eba\u3001Post 3\u4ef6)\n    user1 = User.objects.create(name=\"Test User\")\n\n    Post.objects.create(author=user1, title=\"Post 1\")\n    Post.objects.create(author=user1, title=\"Post 2\")\n    Post.objects.create(author=user1, title=\"Post 3\")\n\n    url = reverse('bad-post-list')\n\n    ### Act & Assert\n    with django_assert_num_queries(1):\n    # \u30af\u30a8\u30ea\u304c1\u56de\u306e\u307f\u306e\u767a\u884c\u3067\u3042\u308b\u3053\u3068\u3092\u691c\u8a3c\n        response = client.get(url)\n\n    assert response.status_code == 200<\/code><\/pre>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u30c6\u30b9\u30c8\u7d50\u679c\u306f\u3053\u3061\u3089\u3067\u3059\u3002 \n\n\n
          \"\"<\/figure>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u3061\u3083\u3093\u3068FAIL\u3057\u3066\u304f\u308c\u307e\u3057\u305f\u306d\u3002\u30af\u30a8\u30ea\u767a\u884c\u56de\u6570\u306e\u671f\u5f85\u5024\u304c1\u306b\u5bfe\u3057\u3066\u30014\u56de\u767a\u884c\u3055\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u30c6\u30b9\u30c8\u304c\u6b63\u5e38\u306b\u52d5\u4f5c\u3057\u3066\u3044\u307e\u3059\u3002 \n\n\n
          FAILED tests\/test_query_check.py::test_bad_post_list_query_count - Failed: Expected to perform 1 queries but 4 were done (add -v option to show queries)<\/code><\/pre>\n\n\n\n
          \u30b3\u30fc\u30c9\u5074\u3092\u6539\u4fee<\/h2>\n\n\n \u3067\u306f\u3001\u30b3\u30fc\u30c9\u5074\u306b\u9069\u5207\u306a\u5b9f\u88c5\u3092\u5165\u308c\u3066\u3001\u30c6\u30b9\u30c8\u304cPASS\u3059\u308b\u3088\u3046\u306b\u306a\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3059\u3002 \n\n \u4eca\u56de\u306e\u30b1\u30fc\u30b9\u3067\u306f\u3001views.py\u3067Post.objects.all()<\/code>\u3092\u4f7f\u7528\u3057\u3066\u3044\u308b\u90e8\u5206\u304cN+1\u554f\u984c\u306e\u539f\u56e0\u306b\u306a\u3063\u3066\u3044\u307e\u3059\u3002 \n\n\n
          # views.py\n\nclass BadPostListAPIView(APIView):\n    def get(self, request):\n        posts = Post.objects.all() # !!! N+1\u554f\u984c\u304c\u767a\u751f\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u66f8\u304d\u65b9<\/code><\/pre>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u3053\u3053\u306bselect_related<\/code>\u3092\u4f7f\u3063\u3066\u3001Post\u3068User\u3092JOIN\u3067\u307e\u3068\u3081\u3066\u53d6\u5f97\u3059\u308b\u3088\u3046\u306b\u66f8\u304d\u63db\u3048\u307e\u3059\u3002 \n\n\n
          # views.py\n\nclass BadPostListAPIView(APIView):\n    def get(self, request):\n        # posts = Post.objects.all()\n        posts = Post.objects.select_related('author').all() # NEW!\n        serializer = BadPostSerializer(posts, many=True)\n        data = serializer.data\n        queries = connection.queries\n        query_count = len(queries)\n\n        print(\"n================ [ N+1 Demo Query Log ] ================\")\n        print(f\"Total Queries Executed: {query_count}\")\n        for i, q in enumerate(queries, 1):\n            print(f\"{i}. [{q['time']}s] {q['sql']}\")\n        print(\"========================================================n\")        \n        return Response(data, status=status.HTTP_200_OK)<\/code><\/pre>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u307e\u305a\u306f\u3053\u306e\u72b6\u614b\u3067\u3001\u610f\u56f3\u901a\u308a\u30af\u30a8\u30ea\u304c\u6700\u9069\u5316\u3055\u308c\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002 \n\n API\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u4ee5\u4e0b\u306e\u30ec\u30b9\u30dd\u30f3\u30b9\u304c\u8fd4\u5374\u3055\u308c\u307e\u3057\u305f\u3002 \n\n\n
          \"\"<\/figure>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u6539\u4fee\u524d\u3068\u540c\u3058\u30ec\u30b9\u30dd\u30f3\u30b9\u304c\u5f97\u3089\u308c\u3066\u3044\u308b\u306e\u3067\u3001\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306f\u6210\u529f\u3057\u3066\u3044\u305d\u3046\u3067\u3059\u3002 \n\n \u3053\u306e\u6642\u306e\u30af\u30a8\u30ea\u30ed\u30b0\u306f\u3069\u3046\u306a\u3063\u3066\u3044\u308b\u306e\u3067\u3057\u3087\u3046\u304b\u3002 \n\n\n
          \"\"<\/figure>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u3092INNER JOIN\u3092\u4f7f\u3046\u3053\u3068\u3067\u4e00\u62ec\u3067\u53d6\u5f97\u3067\u304d\u3066\u3044\u305d\u3046\u3067\u3059\u3002 \n\n \u3067\u306f\u3001\u6700\u5f8c\u306b\u30c6\u30b9\u30c8\u3092\u518d\u5b9f\u884c\u3057\u3001\u5148\u307b\u3069\u306e\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u304cPASS\u3059\u308b\u304b\u3092\u898b\u307e\u3059\u3002 \n\n\n
          \"\"<\/figure>\n\n\n<\/div>\n\n
           <\/div>\n\n
          \u7121\u4e8bPASS\u3057\u307e\u3057\u305f\uff01 \n\n \u3053\u308c\u3067\u5b89\u5fc3\u3057\u3066\u30d7\u30c3\u30b7\u30e5\u3067\u304d\u305d\u3046\u3067\u3059\u3002<\/div>\n\n
           <\/div>\n\n
          \n\n\n\n\n
          \u6700\u5f8c\u306b<\/h2>\nDjango\u306eORM\u306f\u975e\u5e38\u306b\u4fbf\u5229\u3067\u3059\u304c\u3001N+1\u554f\u984c\u306e\u3088\u3046\u306a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4e0a\u306e\u843d\u3068\u3057\u7a74\u304c\u3044\u305f\u308b\u3068\u3053\u308d\u306b\u6f5c\u3093\u3067\u3044\u307e\u3059\u3002\n \n\u958b\u767a\u8005\u306e\u7d4c\u9a13\u3084\u52d8\u306b\u4f9d\u5b58\u3057\u305f\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3060\u3051\u3067\u306f\u3001\u3053\u3046\u3044\u3063\u305f\u554f\u984c\u3092\u898b\u9003\u3057\u3066\u3057\u307e\u3046\u3053\u3068\u3082\u3042\u308a\u307e\u3059\u3002\u4eca\u56de\u3054\u7d39\u4ecb\u3057\u305f\u30c4\u30fc\u30eb\u306a\u3069\u3092\u4f7f\u3063\u3066\u3001\u6a5f\u68b0\u7684\u306b\u691c\u77e5\u3059\u308b\u4ed5\u7d44\u307f\u3092\u4f5c\u3063\u3066\u304a\u304f\u3068\u3001\u30ea\u30ea\u30fc\u30b9\u5f8c\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u554f\u984c\u3092\u672a\u7136\u306b\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\n \n\u307e\u305f\u3001\u4e00\u5ea6\u571f\u53f0\u3092\u4f5c\u308c\u3070\u3001\u3000\u751f\u6210AI\u3092\u6d3b\u7528\u3057\u3066\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u3092\u62e1\u5f35\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002\n<\/div>\n\n","protected":false},"excerpt":{"rendered":"
          \u3053\u3093\u306b\u3061\u306f\uff01\u30c7\u30d0\u30a4\u30b9\u30bd\u30d5\u30c8\u30a6\u30a8\u30a2\u958b\u767a\u90e8\u306e\u7c73\u68ee\u3067\u3059\u3002 \u62c5\u5f53\u3057\u3066\u3044\u308b\u6848\u4ef6\u3067\u3001Web\u30a2\u30d7\u30ea\u958b\u767a\u306bDjango\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002   Django\u306fPython\u306e\u300cbatteries included\u300d\u3068\u3044\u3046\u601d\u60f3\u3092\u8e0f\u8972 […]<\/p>\n","protected":false},"author":121,"featured_media":25178,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[27],"tags":[238,241,50],"_links":{"self":[{"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=\/wp\/v2\/posts\/25148"}],"collection":[{"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=\/wp\/v2\/users\/121"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=25148"}],"version-history":[{"count":53,"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=\/wp\/v2\/posts\/25148\/revisions"}],"predecessor-version":[{"id":25212,"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=\/wp\/v2\/posts\/25148\/revisions\/25212"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=\/wp\/v2\/media\/25178"}],"wp:attachment":[{"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=25148"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=25148"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ecomottblog.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=25148"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}