{"html":"<iframe src=\"https://hatenablog-parts.com/embed?url=https%3A%2F%2Fblog.kyanny.me%2Fentry%2F2021%2F01%2F12%2F171142\" title=\"Django: select_related, prefetch_related, Prefetch \u306e\u4f7f\u3044\u6240 - @kyanny&#39;s blog\" class=\"embed-card embed-blogcard\" scrolling=\"no\" frameborder=\"0\" style=\"display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;\"></iframe>","blog_url":"https://blog.kyanny.me/","url":"https://blog.kyanny.me/entry/2021/01/12/171142","provider_url":"https://hatena.blog","description":"Django: select_related \u3068 prefetch_related \u306b\u3064\u3044\u3066\u30e1\u30e2 - @kyanny's blog \u4ee5\u524d\u30e1\u30e2\u3057\u305f\u304c\u3001\u3084\u306f\u308a\u81ea\u5206\u3067\u624b\u3092\u52d5\u304b\u3055\u306a\u3044\u3068\u8179\u843d\u3061\u3057\u306a\u3044\u306e\u3067\u3002 \u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3068\u5b9f\u884c\u4f8b\u306f\u4ee5\u4e0b\u306b\u7f6e\u3044\u305f\u3002 github.com \u30e2\u30c7\u30eb\u304c Question has many Choice \u3068\u3044\u3046\u95a2\u4fc2\u3067\u3042\u308b\u3068\u304d\u3001 select_related \u306f choice.question \u3068\u3044\u3046\u30a2\u30af\u30bb\u30b9\u3067 N+1 \u30af\u30a8\u30ea\u304c\u767a\u751f\u3059\u308b\u306e\u3092\u9632\u3050\uff08JOIN \u306b\u3088\u3063\u3066\uff09 prefetch_related \u306f question.choice_set (choices) \u3068\u3044\u3046\u30a2\u30af\u30bb\u30b9\u3067 N\u2026","type":"rich","width":"100%","provider_name":"Hatena Blog","published":"2021-01-12 17:11:42","categories":[],"version":"1.0","height":"190","image_url":null,"author_url":"https://blog.hatena.ne.jp/a666666/","blog_title":"@kyanny's blog","author_name":"a666666","title":"Django: select_related, prefetch_related, Prefetch \u306e\u4f7f\u3044\u6240"}