{"id":47694,"date":"2022-11-24T00:51:04","date_gmt":"2023-06-17T05:08:21","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8graphql%e7%9a%84%e7%8e%af%e5%a2%83%e4%b8%ad%ef%bc%8c%e5%85%b3%e4%ba%8e%e6%89%b9%e5%a4%84%e7%90%86\/"},"modified":"2024-04-29T02:12:58","modified_gmt":"2024-04-28T18:12:58","slug":"%e5%9c%a8graphql%e7%9a%84%e7%8e%af%e5%a2%83%e4%b8%ad%ef%bc%8c%e5%85%b3%e4%ba%8e%e6%89%b9%e5%a4%84%e7%90%86","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8graphql%e7%9a%84%e7%8e%af%e5%a2%83%e4%b8%ad%ef%bc%8c%e5%85%b3%e4%ba%8e%e6%89%b9%e5%a4%84%e7%90%86\/","title":{"rendered":"\u5728GraphQL\u7684\u73af\u5883\u4e2d\uff0c\u5173\u4e8e\u6279\u5904\u7406"},"content":{"rendered":"<h1>\u8fd9\u7bc7\u6587\u7ae0\u662f\u5173\u4e8e\u4ec0\u4e48\u7684\uff1f<\/h1>\n<p>\u6211\u5c06\u6839\u636e\u6211\u5728\u4f7f\u7528Rails\u548cGraphQL\u4e2d\u83b7\u5f97\u7684\u7ecf\u9a8c\uff0c\u5bf9\u4e8egem graphql-batch\u548c\u6279\u5904\u7406\u673a\u5236\u8fdb\u884c\u63cf\u8ff0\u3002<\/p>\n<p>\u5982\u679c\u4f60\u60f3\u8981\u5c1d\u8bd5\u8fd0\u884c\u5b9e\u9645\u7684\u4ee3\u7801\uff0c\u8bf7\u53c2\u8003\u6211\u5728\u6b64\u4ed3\u5e93\u4e2d\u63d0\u4ea4\u7684\u4ee3\u7801\uff1ahttps:\/\/github.com\/tanaka51\/sample-rails-graphql-batch\u3002<\/p>\n<h2>\u6211\u6ca1\u6709\u5199\u8fc7\u3002<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">GraphQL \u306b\u3064\u3044\u3066<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">N+1 \u306b\u3064\u3044\u3066<\/ul>\n<h2>\u5723\u8bde\u5012\u6570\u65e5\u5386<\/h2>\n<p>\u672c\u6587\u662f\u4f5c\u4e3aCBcloud Advent Calendar\uff08https:\/\/qiita.com\/advent-calendar\/2020\/cbcloud\uff09\u7684\u7b2c18\u7bc7\u6587\u7ae0\u53d1\u5e03\u7684\u3002<\/p>\n<h1>\u4f7f\u7528\u6279\u5904\u7406\u65b9\u5f0f\u89e3\u51b3GraphQL\u7684N+1\u95ee\u9898<\/h1>\n<h2>\u7528GraphQL\u76f4\u63a5\u5b9e\u73b0\u5e76\u786e\u8ba4N+1\u3002<\/h2>\n<p>\u4ece\u8fd9\u91cc\u5f00\u59cb\uff0c\u6211\u4eec\u6765\u8003\u8651\u4ee5\u4e0b\u6240\u793a\u7684\u7c7b\u4f3c\u535a\u5ba2\u7cfb\u7edf\u7684\u4e1c\u897f\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d8086913a08637a6aa2e7\/10-0.png\" alt=\"GraphQL.png\" \/><\/div>\n<p>\u6709\u4e00\u79cd\u7cfb\u7edf\uff0c\u62e5\u6709\u7528\u6237\u548c\u6587\u7ae0\u7684\u529f\u80fd\u3002\u7528\u6237\u53ef\u4ee5\u64b0\u5199\u6587\u7ae0\uff0c\u5e76\u4e14\u80fd\u591f\u4fdd\u5b58\u81ea\u5df1\u559c\u6b22\u7684\u6587\u7ae0\u4fe1\u606f\u3002<\/p>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u8003\u8651\u5728 GraphQL \u4e2d\u6267\u884c\u4ee5\u4e0b\u67e5\u8be2\u7684\u60c5\u51b5\u3002<\/p>\n<pre class=\"post-pre\"><code>{\r\n  users {\r\n    name\r\n    favorites {\r\n      article {\r\n        title\r\n      }\r\n    }\r\n  }\r\n}\r\n<\/code><\/pre>\n<p>\u8fd9\u4e2a\u67e5\u8be2\u662f\u83b7\u53d6\u6240\u6709\u7528\u6237\u559c\u6b22\u7684\u6587\u7ae0\u6807\u9898\u7684\u6c47\u603b\u3002<\/p>\n<p>\u4f7f\u7528graphql-ruby\u5e93\u6765\u7f16\u5199\u4e0e\u6b64\u67e5\u8be2\u5bf9\u5e94\u7684\u5b9e\u73b0\uff0c\u5219\u5982\u4e0b\u6240\u793a\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">module<\/span> <span class=\"nn\">Types<\/span>\r\n  <span class=\"k\">class<\/span> <span class=\"nc\">QueryType<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">BaseObject<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:users<\/span><span class=\"p\">,<\/span> <span class=\"p\">[<\/span><span class=\"no\">UserType<\/span><span class=\"p\">],<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"k\">def<\/span> <span class=\"nf\">users<\/span>\r\n      <span class=\"no\">User<\/span><span class=\"p\">.<\/span><span class=\"nf\">all<\/span>\r\n    <span class=\"k\">end<\/span>\r\n  <span class=\"k\">end<\/span>\r\n\r\n  <span class=\"k\">class<\/span> <span class=\"nc\">UserType<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">BaseObject<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:name<\/span><span class=\"p\">,<\/span> <span class=\"no\">String<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:articles<\/span><span class=\"p\">,<\/span> <span class=\"p\">[<\/span><span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">ArticleType<\/span><span class=\"p\">],<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:favorites<\/span><span class=\"p\">,<\/span> <span class=\"p\">[<\/span><span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">FavoriteType<\/span><span class=\"p\">],<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n  <span class=\"k\">end<\/span>\r\n\r\n  <span class=\"k\">class<\/span> <span class=\"nc\">FavoriteType<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">BaseObject<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:user<\/span><span class=\"p\">,<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">UserType<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:article<\/span><span class=\"p\">,<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">ArticleType<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n  <span class=\"k\">end<\/span>\r\n\r\n  <span class=\"k\">class<\/span> <span class=\"nc\">ArticleType<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">BaseObject<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:title<\/span><span class=\"p\">,<\/span> <span class=\"no\">String<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:author<\/span><span class=\"p\">,<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">UserType<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n  <span class=\"k\">end<\/span>\r\n<span class=\"k\">end<\/span>\r\n<\/code><\/pre>\n<p>\u8be6\u7ec6\u7684\u5185\u5bb9\u5c31\u7701\u7565\u4e86\uff0c\u4f46\u5728 graphql-ruby \u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5b9a\u4e49\u9700\u8981\u7684\u7c7b\u578b\uff0c\u5e76\u901a\u8fc7\u58f0\u660e\u5f0f\u7684\u65b9\u5f0f\u6765\u7ec4\u7ec7\u5b83\u4eec\uff0c\u4ece\u800c\u5b9a\u4e49\u67e5\u8be2\u3002<\/p>\n<p>\u7136\u540e\uff0c\u5982\u679c\u6309\u7167\u8fd9\u4e2a\u65b9\u5f0f\u6267\u884c\uff0c\u7ed3\u679c\u5c06\u4f1a\u662fN+1\u3002<\/p>\n<pre class=\"post-pre\"><code>Started POST \"\/graphql\" for 127.0.0.1 at 2020-12-14 21:58:27 +0900\r\nProcessing by GraphqlController#execute as HTML\r\n  Parameters: {\"query\"=&gt;\"{\\n  users {\\n    favorites {\\n      article {\\n        title\\n      }\\n    }\\n  }\\n}\", \"variables\"=&gt;nil, \"graphql\"=&gt;{\"query\"=&gt;\"{\\n  users {\\n    favorites {\\n      article {\\n        title\\n      }\\n    }\\n  }\\n}\", \"variables\"=&gt;nil}}\r\nCan't verify CSRF token authenticity.\r\n   (0.1ms)  SELECT sqlite_version(*)\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n  User Load (0.5ms)  SELECT \"users\".* FROM \"users\"\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n  Favorite Load (0.8ms)  SELECT \"favorites\".* FROM \"favorites\" WHERE \"favorites\".\"user_id\" = ?  [[\"user_id\", 1]]\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n  Article Load (0.5ms)  SELECT \"articles\".* FROM \"articles\" WHERE \"articles\".\"id\" = ? LIMIT ?  [[\"id\", 4], [\"LIMIT\", 1]]\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n  Article Load (0.2ms)  SELECT \"articles\".* FROM \"articles\" WHERE \"articles\".\"id\" = ? LIMIT ?  [[\"id\", 5], [\"LIMIT\", 1]]\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n  Favorite Load (0.2ms)  SELECT \"favorites\".* FROM \"favorites\" WHERE \"favorites\".\"user_id\" = ?  [[\"user_id\", 2]]\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n  Article Load (0.2ms)  SELECT \"articles\".* FROM \"articles\" WHERE \"articles\".\"id\" = ? LIMIT ?  [[\"id\", 1], [\"LIMIT\", 1]]\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n  Article Load (0.1ms)  SELECT \"articles\".* FROM \"articles\" WHERE \"articles\".\"id\" = ? LIMIT ?  [[\"id\", 2], [\"LIMIT\", 1]]\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\nCompleted 200 OK in 28ms (Views: 0.3ms | ActiveRecord: 2.8ms | Allocations: 9994)\r\n<\/code><\/pre>\n<h2>\u907f\u514d\u5e38\u89c1\u7684 N+1 \u5199\u4f5c\u65b9\u5f0f<\/h2>\n<p>\u4e3a\u4e86\u6bd4\u8f83\uff0c\u6211\u5c06\u5728\u8fd9\u91cc\u5199\u4e00\u6bb5\u5e38\u89c4\u7684Rails\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">def<\/span> <span class=\"nf\">index<\/span>\r\n  <span class=\"n\">users<\/span> <span class=\"o\">=<\/span> <span class=\"no\">User<\/span><span class=\"p\">.<\/span><span class=\"nf\">all<\/span><span class=\"p\">.<\/span><span class=\"nf\">includes<\/span><span class=\"p\">(<\/span><span class=\"ss\">favorites: :article<\/span><span class=\"p\">).<\/span><span class=\"nf\">map<\/span> <span class=\"k\">do<\/span> <span class=\"o\">|<\/span><span class=\"n\">user<\/span><span class=\"o\">|<\/span>\r\n    <span class=\"p\">{<\/span>\r\n      <span class=\"ss\">name: <\/span><span class=\"n\">user<\/span><span class=\"p\">.<\/span><span class=\"nf\">name<\/span><span class=\"p\">,<\/span>\r\n      <span class=\"ss\">favorites: <\/span><span class=\"n\">user<\/span><span class=\"p\">.<\/span><span class=\"nf\">favorites<\/span><span class=\"p\">.<\/span><span class=\"nf\">map<\/span> <span class=\"k\">do<\/span> <span class=\"o\">|<\/span><span class=\"n\">favorite<\/span><span class=\"o\">|<\/span>\r\n        <span class=\"ss\">article: <\/span><span class=\"p\">{<\/span>\r\n          <span class=\"ss\">title: <\/span><span class=\"n\">favorite<\/span><span class=\"p\">.<\/span><span class=\"nf\">article<\/span><span class=\"p\">.<\/span><span class=\"nf\">title<\/span>\r\n        <span class=\"p\">}<\/span>\r\n      <span class=\"k\">end<\/span>\r\n    <span class=\"p\">}<\/span>\r\n  <span class=\"k\">end<\/span>\r\n\r\n  <span class=\"n\">render<\/span> <span class=\"ss\">:json<\/span><span class=\"p\">,<\/span> <span class=\"p\">{<\/span> <span class=\"ss\">data: <\/span><span class=\"n\">users<\/span> <span class=\"p\">}<\/span>\r\n<span class=\"k\">end<\/span>\r\n<\/code><\/pre>\n<p>\u4e5f\u8bb8\u4f1a\u53d8\u6210\u8fd9\u79cd\u5f62\u5f0f\u3002\u8fd9\u662f\u4e3a\u4e86\u907f\u514d\u5178\u578b\u7684 N+1 \u800c\u5199\u7684\u4ee3\u7801\u3002\u8003\u8651\u5bf9\u8d44\u6e90 User \u4e0b\u9762\u8981\u9644\u52a0\u4ec0\u4e48\uff0c\u5e76\u5c06\u5176\u8bb0\u5f55\u5728\u4ee3\u7801\u4e2d\uff0c\u4ee5\u907f\u514d N+1\u3002<\/p>\n<p>\u8be5\u60f3\u6cd5\u5728GraphQL\u4e2d\u65e0\u6cd5\u5f88\u597d\u5730\u5b9e\u73b0\u3002\u539f\u56e0\u662f\u56e0\u4e3a\u7528\u6237\u53ef\u4ee5\u968f\u610f\u91cd\u65b0\u7ec4\u5408\u67e5\u8be2\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u7528\u6237\u7f16\u5199\u7684\u6587\u7ae0\u5217\u8868\u4e5f\u5fc5\u987b\u5728\u540c\u4e00\u4e2a\u7aef\u70b9\u4e0a\u63d0\u4f9b\u3002<\/p>\n<pre class=\"post-pre\"><code>{\r\n  users {\r\n    name\r\n    articles {\r\n      title\r\n    }\r\n  }\r\n}\r\n<\/code><\/pre>\n<p>\u6362\u53e5\u8bdd\u8bf4\uff0c\u6211\u4eec\u65e0\u6cd5\u4e8b\u5148\u5b9a\u4e49&#8221;\u9644\u52a0\u5728\u5e95\u90e8\u7684\u4e8b\u7269&#8221;\u662f\u4ec0\u4e48\u3002\u867d\u7136\u53ef\u4ee5\u8003\u8651\u5217\u4e3e\u67e5\u8be2\u7684\u6240\u6709\u7ec4\u5408\u5e76\u5bf9\u5b83\u4eec\u6bcf\u4e00\u4e2a\u8fdb\u884c\u5b9a\u4e49\uff0c\u4f46\u8fd9\u5e76\u4e0d\u73b0\u5b9e\u3002<\/p>\n<p>\u4f5c\u4e3a\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u4e00\u79cd\u65b9\u6cd5\uff0cgraphql-batch \u662f\u5f15\u5165\u4e86\u4e00\u4e2a\u53eb\u505a Batch \u7684\u673a\u5236\u7684 gem\u3002\u5728\u4f7f\u7528\u8fd9\u4e2a gem \u7684\u540c\u65f6\uff0c\u6211\u60f3\u4ecb\u7ecd\u4e00\u4e0b\u4ec0\u4e48\u662f Batch \u673a\u5236\u3002<\/p>\n<h2>\u4f7f\u7528graphql-batch\u6765\u907f\u514dN+1\u7684\u95ee\u9898\u3002<\/h2>\n<p>\u9996\u5148\uff0c\u8ba9\u6211\u4eec\u7b80\u5355\u5730\u4f7f\u7528 graphql-batch \u6765\u5199\u4e0b\u4ee3\u7801\uff0c\u770b\u770b\u5b83\u4f1a\u53d8\u6210\u4ec0\u4e48\u6837\u5b50\u3002<\/p>\n<p>\u9996\u5148\u51c6\u5907\u4e00\u4e2a\u52a0\u8f7d\u5668\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c1\"># app\/loaders\/user_favorites_loader.rb<\/span>\r\n<span class=\"k\">class<\/span> <span class=\"nc\">UserFavoritesLoader<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">GraphQL<\/span><span class=\"o\">::<\/span><span class=\"no\">Batch<\/span><span class=\"o\">::<\/span><span class=\"no\">Loader<\/span>\r\n  <span class=\"k\">def<\/span> <span class=\"nf\">perform<\/span><span class=\"p\">(<\/span><span class=\"n\">user_ids<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">favorites<\/span> <span class=\"o\">=<\/span> <span class=\"no\">Favorite<\/span><span class=\"p\">.<\/span><span class=\"nf\">where<\/span><span class=\"p\">(<\/span><span class=\"ss\">user_id: <\/span><span class=\"n\">user_ids<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"n\">favorites<\/span><span class=\"p\">.<\/span><span class=\"nf\">group_by<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"ss\">:user_id<\/span><span class=\"p\">).<\/span><span class=\"nf\">each<\/span> <span class=\"k\">do<\/span> <span class=\"o\">|<\/span><span class=\"n\">user_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">favorites<\/span><span class=\"o\">|<\/span>\r\n      <span class=\"n\">fulfill<\/span><span class=\"p\">(<\/span><span class=\"n\">user_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">favorites<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">end<\/span>\r\n  <span class=\"k\">end<\/span>\r\n<span class=\"k\">end<\/span>\r\n\r\n<span class=\"c1\"># app\/loaders\/article_loader.rb<\/span>\r\n<span class=\"k\">class<\/span> <span class=\"nc\">ArticleLoader<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">GraphQL<\/span><span class=\"o\">::<\/span><span class=\"no\">Batch<\/span><span class=\"o\">::<\/span><span class=\"no\">Loader<\/span>\r\n  <span class=\"k\">def<\/span> <span class=\"nf\">perform<\/span><span class=\"p\">(<\/span><span class=\"n\">ids<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"no\">Article<\/span><span class=\"p\">.<\/span><span class=\"nf\">where<\/span><span class=\"p\">(<\/span><span class=\"ss\">id: <\/span><span class=\"n\">ids<\/span><span class=\"p\">).<\/span><span class=\"nf\">each<\/span><span class=\"p\">{<\/span><span class=\"o\">|<\/span><span class=\"n\">a<\/span><span class=\"o\">|<\/span> <span class=\"n\">fulfill<\/span><span class=\"p\">(<\/span><span class=\"n\">a<\/span><span class=\"p\">.<\/span><span class=\"nf\">id<\/span><span class=\"p\">,<\/span> <span class=\"n\">a<\/span><span class=\"p\">)}<\/span>\r\n  <span class=\"k\">end<\/span>\r\n<span class=\"k\">end<\/span>\r\n<\/code><\/pre>\n<p>\u5728\u7c7b\u578b\u5b9a\u4e49\u7684\u90e8\u5206\uff0c\u6211\u4eec\u8981\u4f7f\u7528 Loader\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">module<\/span> <span class=\"nn\">Types<\/span>\r\n  <span class=\"k\">class<\/span> <span class=\"nc\">UserType<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">BaseObject<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:id<\/span><span class=\"p\">,<\/span> <span class=\"no\">ID<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:name<\/span><span class=\"p\">,<\/span> <span class=\"no\">String<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:created_at<\/span><span class=\"p\">,<\/span> <span class=\"no\">GraphQL<\/span><span class=\"o\">::<\/span><span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">ISO8601DateTime<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:updated_at<\/span><span class=\"p\">,<\/span> <span class=\"no\">GraphQL<\/span><span class=\"o\">::<\/span><span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">ISO8601DateTime<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:articles<\/span><span class=\"p\">,<\/span> <span class=\"p\">[<\/span><span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">ArticleType<\/span><span class=\"p\">],<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">true<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:favorites<\/span><span class=\"p\">,<\/span> <span class=\"p\">[<\/span><span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">FavoriteType<\/span><span class=\"p\">],<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">true<\/span>\r\n\r\n    <span class=\"k\">def<\/span> <span class=\"nf\">favorites<\/span>\r\n      <span class=\"no\">UserFavoritesLoader<\/span><span class=\"p\">.<\/span><span class=\"nf\">for<\/span><span class=\"p\">.<\/span><span class=\"nf\">load<\/span><span class=\"p\">(<\/span><span class=\"n\">object<\/span><span class=\"p\">.<\/span><span class=\"nf\">id<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">end<\/span>\r\n  <span class=\"k\">end<\/span>\r\n<span class=\"k\">end<\/span>\r\n\r\n<span class=\"k\">module<\/span> <span class=\"nn\">Types<\/span>\r\n  <span class=\"k\">class<\/span> <span class=\"nc\">FavoriteType<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">BaseObject<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:id<\/span><span class=\"p\">,<\/span> <span class=\"no\">ID<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:created_at<\/span><span class=\"p\">,<\/span> <span class=\"no\">GraphQL<\/span><span class=\"o\">::<\/span><span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">ISO8601DateTime<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:updated_at<\/span><span class=\"p\">,<\/span> <span class=\"no\">GraphQL<\/span><span class=\"o\">::<\/span><span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">ISO8601DateTime<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:user<\/span><span class=\"p\">,<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">UserType<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">true<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:article<\/span><span class=\"p\">,<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">ArticleType<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">true<\/span>\r\n\r\n    <span class=\"k\">def<\/span> <span class=\"nf\">article<\/span>\r\n      <span class=\"no\">ArticleLoader<\/span><span class=\"p\">.<\/span><span class=\"nf\">for<\/span><span class=\"p\">.<\/span><span class=\"nf\">load<\/span><span class=\"p\">(<\/span><span class=\"n\">object<\/span><span class=\"p\">.<\/span><span class=\"nf\">article_id<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">end<\/span>\r\n  <span class=\"k\">end<\/span>\r\n<span class=\"k\">end<\/span>\r\n<\/code><\/pre>\n<p>\u5f53\u4f60\u8fd0\u884c\u5b83\uff0c\u670d\u52a1\u5668\u7684\u65e5\u5fd7\u5c06\u5982\u4e0b\u6240\u793a\uff0c\u4f60\u5c31\u4f1a\u77e5\u9053 N+1 \u7684\u95ee\u9898\u5df2\u7ecf\u89e3\u51b3\u4e86\u3002<\/p>\n<pre class=\"post-pre\"><code>Started POST \"\/graphql\" for 127.0.0.1 at 2020-12-18 13:51:59 +0900\r\nProcessing by GraphqlController#execute as HTML\r\n  Parameters: {\"query\"=&gt;\"{\\n  users {\\n    favorites {\\n      article {\\n        title\\n      }\\n    }\\n  }\\n}\", \"variables\"=&gt;nil, \"graphql\"=&gt;{\"query\"=&gt;\"{\\n  users {\\n    favorites {\\n      article {\\n        title\\n      }\\n    }\\n  }\\n}\", \"variables\"=&gt;nil}}\r\nCan't verify CSRF token authenticity.\r\n  User Load (0.1ms)  SELECT \"users\".* FROM \"users\"\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n  Favorite Load (0.2ms)  SELECT \"favorites\".* FROM \"favorites\" WHERE \"favorites\".\"user_id\" IN (?, ?)  [[nil, 1], [nil, 2]]\r\n  \u21b3 app\/loaders\/favorites_loader.rb:4:in `group_by'\r\n  Article Load (0.3ms)  SELECT \"articles\".* FROM \"articles\" WHERE \"articles\".\"id\" IN (?, ?, ?, ?)  [[nil, 4], [nil, 5], [nil, 1], [nil, 2]]\r\n  \u21b3 app\/loaders\/article_loader.rb:3:in `perform'\r\nCompleted 200 OK in 10ms (Views: 0.4ms | ActiveRecord: 0.7ms | Allocations: 3675)\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u662f\u4f7f\u7528Loader\u7684\u6700\u57fa\u672c\u7684\u65b9\u5f0f\u3002<\/p>\n<h3>GraphQL-Batch\u7684\u4f7f\u7528\u65b9\u6cd5\u3002<\/h3>\n<p>\u6211\u5c06\u66f4\u6df1\u5165\u5730\u89e3\u91ca\u4e00\u4e0bgrapql-batch\u3002<\/p>\n<p>\u9996\u5148\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0b\u4f7f\u7528Loader\u7684\u6700\u7b80\u4ee3\u7801\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">class<\/span> <span class=\"nc\">ArticleLoader<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">GraphQL<\/span><span class=\"o\">::<\/span><span class=\"no\">Batch<\/span><span class=\"o\">::<\/span><span class=\"no\">Loader<\/span>\r\n  <span class=\"k\">def<\/span> <span class=\"nf\">perform<\/span><span class=\"p\">(<\/span><span class=\"n\">ids<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"no\">Article<\/span><span class=\"p\">.<\/span><span class=\"nf\">where<\/span><span class=\"p\">(<\/span><span class=\"ss\">id: <\/span><span class=\"n\">ids<\/span><span class=\"p\">).<\/span><span class=\"nf\">each<\/span><span class=\"p\">{<\/span><span class=\"o\">|<\/span><span class=\"n\">a<\/span><span class=\"o\">|<\/span> <span class=\"n\">fulfill<\/span><span class=\"p\">(<\/span><span class=\"n\">a<\/span><span class=\"p\">.<\/span><span class=\"nf\">id<\/span><span class=\"p\">,<\/span> <span class=\"n\">a<\/span><span class=\"p\">)}<\/span>\r\n  <span class=\"k\">end<\/span>\r\n<span class=\"k\">end<\/span>\r\n\r\n<span class=\"k\">module<\/span> <span class=\"nn\">Types<\/span>\r\n  <span class=\"k\">class<\/span> <span class=\"nc\">FavoriteType<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">BaseObject<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:article<\/span><span class=\"p\">,<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">ArticleType<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">true<\/span>\r\n\r\n    <span class=\"k\">def<\/span> <span class=\"nf\">article<\/span>\r\n      <span class=\"no\">ArticleLoader<\/span><span class=\"p\">.<\/span><span class=\"nf\">for<\/span><span class=\"p\">.<\/span><span class=\"nf\">load<\/span><span class=\"p\">(<\/span><span class=\"n\">object<\/span><span class=\"p\">.<\/span><span class=\"nf\">article_id<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">end<\/span>\r\n  <span class=\"k\">end<\/span>\r\n<span class=\"k\">end<\/span>\r\n<\/code><\/pre>\n<p>\u57fa\u672c\u7684\u5730\u4f7f\u7528 Loader \u7684\u65b9\u6cd5\u5982\u4e0b\uff1a<br \/>\n1. \u4f7f\u7528 for \u65b9\u6cd5\u8fdb\u884c\u521d\u59cb\u5316<br \/>\n2. \u4f7f\u7528 load \u65b9\u6cd5\u4f20\u5165\u5173\u952e\u503c<\/p>\n<p>\u4e0b\u9762\u662f\u8981\u6c42\u7684\u4e2d\u6587\u7ffb\u8bd1\uff1a<br \/>\n\u5e76\u4e14 Loader \u7684\u5b9e\u73b0\u6b65\u9aa4\u5982\u4e0b\uff1a<br \/>\n1. \u521b\u5efa\u4e00\u4e2a\u7ee7\u627f\u81ea GraphQL::Batch::Loader \u7684\u7c7b<br \/>\n2. \u5b9e\u73b0 perform \u65b9\u6cd5<\/p>\n<p>\u8fd9\u662f\u4ee5\u4e0b\u5185\u5bb9\u7684\u540c\u4e49\u77ed\u8bed\uff1a\u7136\u540e\u3002<\/p>\n<p>\u63a5\u4e0b\u6765\uff0c\u5c06\u89e3\u91ca\u5982\u4f55\u5b9e\u73b0 perform \u65b9\u6cd5\u3002<\/p>\n<p>\u5728\u751f\u6210\u6700\u7ec8\u54cd\u5e94\u65f6\u4f1a\u8c03\u7528 perform\u3002\u5f53\u5b9e\u9645\u8c03\u7528\u65f6\uff0c\u4f20\u9012\u7684\u503c\u5c06\u4f5c\u4e3a\u4e00\u4e2a\u6570\u7ec4\u4f20\u9012\u7ed9 load\u3002\u5728\u8fd9\u4e2a\u65f6\u673a\u4e0a\uff0c\u4f1a\u4e00\u6b21\u6027\u83b7\u53d6\u8d44\u6e90\uff0c\u5e76\u5c01\u88c5\u5230 fulfill \u65b9\u6cd5\u4e2d\u3002<\/p>\n<p>\u5c65\u884c\u9700\u8981\u6309\u7167\u952e\u548c\u503c\u7684\u987a\u5e8f\u4f20\u9012\u503c\u3002\u5176\u4e2d\u952e\u6307\u5b9a\u4e0e\u4f20\u9012\u7ed9\u52a0\u8f7d\u7684\u503c\u76f8\u540c\u7684\u503c\u3002\u901a\u8fc7\u8fd9\u6837\u505a\uff0c\u52a0\u8f7d\u53ef\u4ee5\u5c06\u503c\u4f5c\u4e3a\u8fd4\u56de\u503c\u63d0\u53d6\u51fa\u6765\u3002<\/p>\n<p>\u56e0\u4e3a\u7528\u6587\u5b57\u89e3\u91ca\u53ef\u80fd\u4e0d\u592a\u5bb9\u6613\u7406\u89e3\uff0c\u6240\u4ee5\u6211\u4e5f\u4f1a\u9644\u4e0a\u56fe\u7247\u6765\u8bf4\u660e\u3002<\/p>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d8086913a08637a6aa2e7\/48-0.png\" alt=\"IMG_0208.PNG\" \/><\/div>\n<p>\u5e0c\u671b\u4f60\u80fd\u591f\u901a\u8fc7\u8fd9\u4e2a\u6765\u6b63\u786e\u7406\u89e3\uff0c\u603b\u7ed3\u4e00\u4e0b\u8981\u70b9\u5c31\u662f\uff1a<\/p>\n<p>load \u3067\u5024\u3092\u96c6\u3081\u308b<br \/>\n\u96c6\u3081\u305f\u5024\u306f perform \u3067\u51e6\u7406\u3055\u308c\u308b<\/p>\n<p>perform \u5185\u3067\u30ea\u30bd\u30fc\u30b9\u3092\u307e\u3068\u3081\u3066\u53d6\u5f97\u3057\u3001 fulfill \u3067\u8a70\u3081\u3066\u3044\u304f<\/p>\n<p>fulfill \u3067\u8a70\u3081\u305f\u5024\u3092 load \u304c\u53d6\u308a\u51fa\u3057\u3066\u623b\u308a\u5024\u3068\u306a\u308b<\/p>\n<p>\u4e0b\u9762\u662f\u4e00\u4e2a\u6c49\u8bed\u7684\u8868\u8ff0\uff1a<br \/>\n\u5c31\u662f\u8fd9\u6837\u3002<\/p>\n<p>\u6211\u8ba4\u4e3a\u4e0a\u8ff0\u8981\u70b9\u5373\u4e3a\u6279\u5904\u7406\u7684\u6982\u5ff5\u3002<br \/>\n\u4e0d\u7acb\u5373\u6267\u884c\u773c\u524d\u7684\u5904\u7406\uff0c\u800c\u662f\u5148\u5c06\u5176\u6682\u5b58\u5728\u53e6\u4e00\u4e2a\u5730\u65b9\uff0c\u6700\u540e\u4e00\u8d77\u5904\u7406\u3002<\/p>\n<h1>\u5b9e\u65bd\u793a\u4f8b<\/h1>\n<p>\u4ee5\u4e0b\u662f\u4ece README \u4e2d\u63d0\u53d6\u7684\u5185\u5bb9\uff1a<br \/>\n\u5173\u4e8e graphql-batch\uff0c\u6211\u4eec\u53ef\u4ee5\u4ece\u5b83\u7684\u521d\u59cb\u5316\u65b9\u6cd5 .for \u53ef\u4ee5\u770b\u51fa\uff0c\u5b83\u5b9e\u9645\u4e0a\u662f\u4e00\u4e2a\u901a\u7528\u8bbe\u8ba1\u7684\u7ec4\u4ef6\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"n\">field<\/span> <span class=\"ss\">:product<\/span><span class=\"p\">,<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">Product<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">true<\/span> <span class=\"k\">do<\/span>\r\n  <span class=\"n\">argument<\/span> <span class=\"ss\">:id<\/span><span class=\"p\">,<\/span> <span class=\"no\">ID<\/span><span class=\"p\">,<\/span> <span class=\"ss\">required: <\/span><span class=\"kp\">true<\/span>\r\n<span class=\"k\">end<\/span>\r\n\r\n<span class=\"k\">def<\/span> <span class=\"nf\">product<\/span><span class=\"p\">(<\/span><span class=\"nb\">id<\/span><span class=\"p\">:)<\/span>\r\n  <span class=\"no\">RecordLoader<\/span><span class=\"p\">.<\/span><span class=\"nf\">for<\/span><span class=\"p\">(<\/span><span class=\"no\">Product<\/span><span class=\"p\">).<\/span><span class=\"nf\">load<\/span><span class=\"p\">(<\/span><span class=\"nb\">id<\/span><span class=\"p\">)<\/span>\r\n<span class=\"k\">end<\/span>\r\n<\/code><\/pre>\n<p>\u53e6\u5916\uff0c\u5728\u793a\u4f8b\u4e2d\u53ef\u4ee5\u627e\u5230 Loader \u7684\u4f8b\u5b50\uff0c\u6240\u4ee5\u57fa\u672c\u4e0a\u4f60\u53ea\u9700\u8981\u4f7f\u7528\u8fd9\u4e2a\u5c31\u53ef\u4ee5\u4e86\u3002<br \/>\nhttps:\/\/github.com\/Shopify\/graphql-batch\/tree\/master\/examples<\/p>\n<p>\u770b\u8d77\u6765\u4e5f\u8bb8\u5bf9 Loader \u7684\u5b9e\u73b0\u65b9\u5f0f\u4e00\u5f00\u59cb\u4f1a\u6709\u4e9b\u96be\u4ee5\u7406\u89e3\uff0c\u4f46\u6211\u5e0c\u671b\u8fd9\u7bc7\u6587\u7ae0\u80fd\u5bf9\u60a8\u5728\u9605\u8bfb\u8fc7\u7a0b\u4e2d\u63d0\u4f9b\u4e00\u4e9b\u5e2e\u52a9\u3002<\/p>\n<h2>\u5728\u8d44\u6e90\u8ba1\u6570\u4e2d\uff0c\u89e3\u51b3N+1\u95ee\u9898\u7684\u65b9\u6cd5<\/h2>\n<p>\u6211\u60f3\u5199\u4e00\u4e2a\u4f5c\u4e3a\u672a\u6765\u5b9e\u73b0\u7684\u793a\u4f8b\uff0c\u5373\u8d44\u6e90\u8ba1\u6570\u7684 Loader\u3002<br \/>\n\u4f8b\u5982\uff0c\u7528\u5b83\u6765\u5904\u7406\u8fd9\u6837\u7684\u67e5\u8be2\u3002<\/p>\n<pre class=\"post-pre\"><code>{\r\n  users {\r\n    favorites_count\r\n  }\r\n}\r\n<\/code><\/pre>\n<p>\u5982\u679c\u4ee5\u7b80\u5355\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\u5b83\uff0c\u5c31\u4f1a\u53d8\u6210\u8fd9\u6837\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">module<\/span> <span class=\"nn\">Types<\/span>\r\n  <span class=\"k\">class<\/span> <span class=\"nc\">UserType<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">BaseObject<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:favorites_count<\/span><span class=\"p\">,<\/span> <span class=\"no\">Integer<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">false<\/span>\r\n\r\n    <span class=\"k\">def<\/span> <span class=\"nf\">favorites_count<\/span>\r\n      <span class=\"n\">object<\/span><span class=\"p\">.<\/span><span class=\"nf\">favorites<\/span><span class=\"p\">.<\/span><span class=\"nf\">count<\/span>\r\n    <span class=\"k\">end<\/span>\r\n  <span class=\"k\">end<\/span>\r\n<span class=\"k\">end<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>Started POST \"\/graphql\" for 127.0.0.1 at 2020-12-18 17:39:42 +0900\r\nProcessing by GraphqlController#execute as HTML\r\n  Parameters: {\"query\"=&gt;\"{\\n  users {\\n    favoritesCount\\n  }\\n}\", \"variables\"=&gt;nil, \"graphql\"=&gt;{\"query\"=&gt;\"{\\n  users {\\n    favoritesCount\\n  }\\n}\", \"variables\"=&gt;nil}}\r\nCan't verify CSRF token authenticity.\r\n  User Load (0.6ms)  SELECT \"users\".* FROM \"users\"\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n   (0.5ms)  SELECT COUNT(*) FROM \"favorites\" WHERE \"favorites\".\"user_id\" = ?  [[\"user_id\", 1]]\r\n  \u21b3 app\/graphql\/types\/user_type.rb:16:in `favorites_count'\r\n   (0.2ms)  SELECT COUNT(*) FROM \"favorites\" WHERE \"favorites\".\"user_id\" = ?  [[\"user_id\", 2]]\r\n  \u21b3 app\/graphql\/types\/user_type.rb:16:in `favorites_count'\r\nCompleted 200 OK in 34ms (Views: 0.3ms | ActiveRecord: 2.0ms | Allocations: 10884)\r\n<\/code><\/pre>\n<p>\u4ee5\u8fd9\u79cd\u65b9\u5f0f\uff0c\u5c06\u4f1a\u53d1\u51fa\u4e0e\u7528\u6237\u6570\u91cf\u4e00\u6837\u591a\u7684 COUNT \u67e5\u8be2\u8bed\u53e5\u3002<br \/>\n\u5373\u4f7f\u5728\u4f7f\u7528 Rails \u65f6\u8003\u8651\u4f7f\u7528 counter_cache \u7684\u60c5\u51b5\u4e0b\uff0c\u4f7f\u7528 Loader \u53ef\u4ee5\u4f7f\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"k\">class<\/span> <span class=\"nc\">UserFavoritesCountLoader<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">GraphQL<\/span><span class=\"o\">::<\/span><span class=\"no\">Batch<\/span><span class=\"o\">::<\/span><span class=\"no\">Loader<\/span>\r\n  <span class=\"k\">def<\/span> <span class=\"nf\">perform<\/span><span class=\"p\">(<\/span><span class=\"n\">user_ids<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"no\">Favorite<\/span><span class=\"p\">.<\/span><span class=\"nf\">where<\/span><span class=\"p\">(<\/span><span class=\"ss\">user_id: <\/span><span class=\"n\">user_ids<\/span><span class=\"p\">).<\/span><span class=\"nf\">group<\/span><span class=\"p\">(<\/span><span class=\"ss\">:user_id<\/span><span class=\"p\">).<\/span><span class=\"nf\">count<\/span><span class=\"p\">.<\/span><span class=\"nf\">each<\/span> <span class=\"k\">do<\/span> <span class=\"o\">|<\/span><span class=\"n\">user_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">count<\/span><span class=\"o\">|<\/span>\r\n      <span class=\"n\">fulfill<\/span><span class=\"p\">(<\/span><span class=\"n\">user_id<\/span><span class=\"p\">,<\/span> <span class=\"n\">count<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">end<\/span>\r\n  <span class=\"k\">end<\/span>\r\n<span class=\"k\">end<\/span>\r\n\r\n<span class=\"k\">module<\/span> <span class=\"nn\">Types<\/span>\r\n  <span class=\"k\">class<\/span> <span class=\"nc\">UserType<\/span> <span class=\"o\">&lt;<\/span> <span class=\"no\">Types<\/span><span class=\"o\">::<\/span><span class=\"no\">BaseObject<\/span>\r\n    <span class=\"n\">field<\/span> <span class=\"ss\">:favorites_count<\/span><span class=\"p\">,<\/span> <span class=\"no\">Integer<\/span><span class=\"p\">,<\/span> <span class=\"ss\">null: <\/span><span class=\"kp\">true<\/span>\r\n\r\n    <span class=\"k\">def<\/span> <span class=\"nf\">favorites_count<\/span>\r\n      <span class=\"no\">UserFavoritesCountLoader<\/span><span class=\"p\">.<\/span><span class=\"nf\">for<\/span><span class=\"p\">.<\/span><span class=\"nf\">load<\/span><span class=\"p\">(<\/span><span class=\"n\">object<\/span><span class=\"p\">.<\/span><span class=\"nf\">id<\/span><span class=\"p\">)<\/span>\r\n    <span class=\"k\">end<\/span>\r\n  <span class=\"k\">end<\/span>\r\n<span class=\"k\">end<\/span>\r\n\r\n<\/code><\/pre>\n<p>\u4e0a\u8ff0\u6240\u8ff0\u7684UserFavoritesLoader\u51e0\u4e4e\u4e0d\u53d8\uff0c\u5176\u5185\u5bb9\u662f\u4ee5\u6536\u96c6\u5230\u7684user_id\u8fdb\u884cgroup by + count\uff0c\u5c06\u76ee\u6807user_id\u4f5c\u4e3a\u952e\u5e76\u4fdd\u5b58\u8ba1\u6570\u3002<\/p>\n<pre class=\"post-pre\"><code>Started POST \"\/graphql\" for 127.0.0.1 at 2020-12-18 17:43:16 +0900\r\nProcessing by GraphqlController#execute as HTML\r\n  Parameters: {\"query\"=&gt;\"{\\n  users {\\n    favoritesCount\\n  }\\n}\", \"variables\"=&gt;nil, \"graphql\"=&gt;{\"query\"=&gt;\"{\\n  users {\\n    favoritesCount\\n  }\\n}\", \"variables\"=&gt;nil}}\r\nCan't verify CSRF token authenticity.\r\n   (0.1ms)  SELECT sqlite_version(*)\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n  User Load (0.1ms)  SELECT \"users\".* FROM \"users\"\r\n  \u21b3 app\/controllers\/graphql_controller.rb:15:in `execute'\r\n   (0.2ms)  SELECT COUNT(*) AS count_all, \"favorites\".\"user_id\" AS favorites_user_id FROM \"favorites\" WHERE \"favorites\".\"user_id\" IN (?, ?) GROUP BY \"favorites\".\"user_id\"  [[nil, 1], [nil, 2]]\r\n  \u21b3 app\/loaders\/user_favorites_count_loader.rb:3:in `perform'\r\nCompleted 200 OK in 25ms (Views: 0.3ms | ActiveRecord: 1.8ms | Allocations: 9009)\r\n<\/code><\/pre>\n<p>\u8fd9\u6837\u5c31\u80fd\u907f\u514d\u4e86N+1\u3002<\/p>\n<h1>\u603b\u7ed3<\/h1>\n<p>\u6211\u4f7f\u7528graphql-batch gem\u5b9e\u73b0\u4e86\u4e00\u4e2a\u7b80\u5355\u7684Loader\uff0c\u5e76\u89e3\u91ca\u4e86\u5982\u4f55\u4f7f\u7528\u3002\u867d\u7136\u5728\u672c\u6587\u4e2d\u6211\u4eec\u521b\u5efa\u4e86\u4e00\u4e2a\u6709\u9650\u7684Loader\uff0c\u4f46\u5982\u679c\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u901a\u7528\u7684Loader\uff0c\u6211\u4eec\u53ea\u9700\u8981\u4f7f\u7528Loader\u6765\u83b7\u53d6\u8d44\u6e90\uff0c\u7136\u540e\u5c31\u4e0d\u9700\u8981\u62c5\u5fc3N+1\u7684\u95ee\u9898\u4e86\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u66f4\u52a0\u4e13\u6ce8\u4e8e\u6838\u5fc3\u7684\u95ee\u9898\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u7bc7\u6587\u7ae0\u662f\u5173\u4e8e\u4ec0\u4e48\u7684\uff1f \u6211\u5c06\u6839\u636e\u6211\u5728\u4f7f\u7528Rails\u548cGraphQL\u4e2d\u83b7\u5f97\u7684\u7ecf\u9a8c\uff0c\u5bf9\u4e8egem graphql-b [&hellip;]<\/p>\n","protected":false},"author":11,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-47694","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - 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