{"id":47920,"date":"2023-03-26T07:48:39","date_gmt":"2024-01-24T08:42:25","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8reactamplifyappsynctypescript%e6%9e%84%e5%bb%ba%e5%ae%9e%e6%97%b6%e7%95%99%e8%a8%80%e6%9d%bf%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e3%80%82\/"},"modified":"2024-04-29T20:36:36","modified_gmt":"2024-04-29T12:36:36","slug":"%e4%bd%bf%e7%94%a8reactamplifyappsynctypescript%e6%9e%84%e5%bb%ba%e5%ae%9e%e6%97%b6%e7%95%99%e8%a8%80%e6%9d%bf%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e4%bd%bf%e7%94%a8reactamplifyappsynctypescript%e6%9e%84%e5%bb%ba%e5%ae%9e%e6%97%b6%e7%95%99%e8%a8%80%e6%9d%bf%e5%ba%94%e7%94%a8%e7%a8%8b%e5%ba%8f%e3%80%82\/","title":{"rendered":"\u4f7f\u7528React+Amplify+AppSync+TypeScript\u6784\u5efa\u5b9e\u65f6\u7559\u8a00\u677f\u5e94\u7528\u7a0b\u5e8f"},"content":{"rendered":"
\"amplify_react_ts.png\"<\/div>\n

\u6211\u53d7[“\u3010\u7206\u901f\u3011React+Amplify+AppSync\u3067\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u63b2\u793a\u677f\u30a2\u30d7\u30ea\u309215\u5206\u3067\u4f5c\u308a\u4e0a\u3052\u308b\u3000\u301c\u3053\u308c\u304c\u6700\u9ad8\u306eDeveloper Experience\u3060\u301c – Qiita”]\u9019\u7bc7\u6587\u7ae0\u7684\u555f\u767c\u53bb\u5275\u4f5c\u3002<\/p>\n

\u7531\u4e8e\u5728Amplify\u547d\u4ee4\u4e2d\u53ef\u4ee5\u9009\u62e9TypeScript\u6765\u81ea\u52a8\u751f\u6210\u4ee3\u7801\uff0c\u6211\u8bd5\u7740\u770b\u770b\u5b83\u662f\u4ec0\u4e48\u6837\u7684\u3002
\n\u987a\u4fbf\u4e00\u63d0\uff0c\u6211\u4e5f\u5728\u4f7f\u7528React\u7684Hooks\u3002<\/p>\n

\u7248\u672c<\/h2>\n

\u6211\u4f7f\u7528\u7684\u73af\u5883\u5982\u4e0b\uff1a<\/p>\n

$ <\/span>create-react-app --version<\/span>\r\n3.0.1\r\n$ <\/span>node -v<\/span>\r\nv8.15.1\r\n$ <\/span>npm -v<\/span>\r\n6.9.0\r\n$ <\/span>amplify --version<\/span>\r\n1.7.0\r\n<\/code><\/pre>\n
\u7531\u4e8e\u6211\u7684\u73af\u5883\u4e2d\u751a\u81f3\u6ca1\u6709amplify\u547d\u4ee4\uff0c\u56e0\u6b64\u6211\u67e5\u770b\u4e86\u5b98\u65b9\u9875\u9762\u5e76\u8fdb\u884c\u4e86\u5b89\u88c5\u3002<\/p>\n
\u5f00\u59cb \u00b7 \u521b\u5efaReact App<\/p>\n
\u521b\u5efaReact\u5e94\u7528\u7a0b\u5e8f\u7684\u6a21\u677f<\/h2>\n
\u4f7f\u7528 create-react-app \u547d\u4ee4\u6dfb\u52a0\u53c2\u6570 –typescript \u521b\u5efa\u5e94\u7528\uff0c\u5e76\u4f7f\u7528 amplify init \u547d\u4ee4\u8fdb\u884c\u521d\u59cb\u5316\u914d\u7f6e\u3002
\n\u8bf7\u6839\u636e\u9700\u8981\u81ea\u884c\u8c03\u6574\u914d\u7f6e\u6587\u4ef6\u4e2d\u7684 profile \u7b49\u8bbe\u7f6e\u3002<\/p>\n
$ <\/span>create-react-app boardapp --typescript<\/span>\r\n$ <\/span>cd <\/span>boardapp\r\n$ <\/span>amplify init\r\nNote: It is recommended to run this command <\/span>from the root of your app directory\r\n? Enter a name for <\/span>the project boardapp\r\n? Enter a name for <\/span>the environment dev\r\n? Choose your default editor: Visual Studio Code\r\n? Choose the type <\/span>of app that you're building javascript\r\nPlease tell us about your project\r\n? What javascript framework are you using react\r\n? Source Directory Path:  src\r\n? Distribution Directory Path: build\r\n? Build Command:  npm run-script build\r\n? Start Command: npm run-script start\r\n? Do you want to use an AWS profile? Yes\r\n? Please choose the profile you want to use default\r\n<\/span><\/code><\/pre>\n
\u6dfb\u52a0GraphQL\u7684API\u3002<\/p>\n
$ <\/span>amplify add api\r\n? Please select <\/span>from one of the below mentioned services GraphQL\r\n? Provide API name: boardapp\r\n? Choose an authorization type <\/span>for <\/span>the API API key\r\n? Do you have an annotated GraphQL schema? No\r\n? Do you want a guided schema creation? No\r\n? Provide a custom type <\/span>name Post\r\n<\/code><\/pre>\n
\u7531\u65bc\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67b6\u69cb\u7684\u793a\u4f8b\uff0c\u56e0\u6b64\u76f4\u63a5\u4f7f\u7528\u3002<\/p>\n
type<\/span> Post<\/span> @<\/span>model<\/span> {<\/span>\r\n    id<\/span>:<\/span> ID<\/span>!<\/span>\r\n    title<\/span>:<\/span> String<\/span>!<\/span>\r\n    content<\/span>:<\/span> String<\/span>!<\/span>\r\n    price<\/span>:<\/span> Int<\/span>\r\n    rating<\/span>:<\/span> Float<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5c06\u8fdb\u884c\u90e8\u7f72\u5e76\u81ea\u52a8\u751f\u6210\u5ba2\u6237\u7aef\u4ee3\u7801\u3002<\/p>\n
$ <\/span>amplify push\r\n? Are you sure you want to continue<\/span>? Yes\r\n? Do you want to generate code for <\/span>your newly created GraphQL API Yes\r\n? Choose the code generation language target typescript\r\n? Enter the file name pattern of graphql queries, mutations and subscriptions src\/graphql\/**<\/span>\/*<\/span>.ts\r\n? Do you want to generate\/update all possible GraphQL operations - queries, mutations and subscriptions Yes\r\n? Enter maximum statement depth [<\/span>increase from default if <\/span>your schema is deeply nested] 2\r\n? Enter the file name for <\/span>the generated code src\/API.ts\r\n<\/code><\/pre>\n
\u5f53\u62b5\u8fbe\u8fd9\u91cc\u65f6\uff0cGraphQL\u7684API\u5df2\u7ecf\u90e8\u7f72\u5230\u4e86AWS\u4e0a\uff0c\u672c\u5730\u76ee\u5f55\u7ed3\u6784\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
$ <\/span>tree -L<\/span> 5 -I<\/span> \"node_modules\"<\/span>\r\n.<\/span>\r\n\u251c\u2500\u2500 README.md\r\n\u251c\u2500\u2500 amplify\r\n\u2502   \u251c\u2500\u2500 #current-cloud-backend<\/span>\r\n\u2502   \u2502   \u251c\u2500\u2500 amplify-meta.json\r\n\u2502   \u2502   \u251c\u2500\u2500 api\r\n\u2502   \u2502   \u2502   \u2514\u2500\u2500 boardapp\r\n\u2502   \u2502   \u2502       \u251c\u2500\u2500 build\r\n\u2502   \u2502   \u2502       \u251c\u2500\u2500 parameters.json\r\n\u2502   \u2502   \u2502       \u251c\u2500\u2500 resolvers\r\n\u2502   \u2502   \u2502       \u251c\u2500\u2500 schema.graphql\r\n\u2502   \u2502   \u2502       \u2514\u2500\u2500 stacks\r\n\u2502   \u2502   \u2514\u2500\u2500 backend-config.json\r\n\u2502   \u251c\u2500\u2500 backend\r\n\u2502   \u2502   \u251c\u2500\u2500 amplify-meta.json\r\n\u2502   \u2502   \u251c\u2500\u2500 api\r\n\u2502   \u2502   \u2502   \u2514\u2500\u2500 boardapp\r\n\u2502   \u2502   \u2502       \u251c\u2500\u2500 build\r\n\u2502   \u2502   \u2502       \u251c\u2500\u2500 parameters.json\r\n\u2502   \u2502   \u2502       \u251c\u2500\u2500 resolvers\r\n\u2502   \u2502   \u2502       \u251c\u2500\u2500 schema.graphql\r\n\u2502   \u2502   \u2502       \u2514\u2500\u2500 stacks\r\n\u2502   \u2502   \u251c\u2500\u2500 awscloudformation\r\n\u2502   \u2502   \u2502   \u2514\u2500\u2500 nested-cloudformation-stack.yml\r\n\u2502   \u2502   \u2514\u2500\u2500 backend-config.json\r\n\u2502   \u2514\u2500\u2500 team-provider-info.json\r\n\u251c\u2500\u2500 package.json\r\n\u251c\u2500\u2500 public\r\n\u2502   \u251c\u2500\u2500 favicon.ico\r\n\u2502   \u251c\u2500\u2500 index.html\r\n\u2502   \u2514\u2500\u2500 manifest.json\r\n\u251c\u2500\u2500 src\r\n\u2502   \u251c\u2500\u2500 API.ts\r\n\u2502   \u251c\u2500\u2500 App.css\r\n\u2502   \u251c\u2500\u2500 App.test.tsx\r\n\u2502   \u251c\u2500\u2500 App.tsx\r\n\u2502   \u251c\u2500\u2500 aws-exports.js\r\n\u2502   \u251c\u2500\u2500 graphql\r\n\u2502   \u2502   \u251c\u2500\u2500 mutations.ts\r\n\u2502   \u2502   \u251c\u2500\u2500 queries.ts\r\n\u2502   \u2502   \u251c\u2500\u2500 schema.json\r\n\u2502   \u2502   \u2514\u2500\u2500 subscriptions.ts\r\n\u2502   \u251c\u2500\u2500 index.css\r\n\u2502   \u251c\u2500\u2500 index.tsx\r\n\u2502   \u251c\u2500\u2500 logo.svg\r\n\u2502   \u251c\u2500\u2500 react-app-env.d.ts\r\n\u2502   \u2514\u2500\u2500 serviceWorker.ts\r\n\u251c\u2500\u2500 tsconfig.json\r\n\u2514\u2500\u2500 yarn.lock\r\n<\/code><\/pre>\n
\u6dfb\u52a0amplify\u7684\u8f6f\u4ef6\u5305<\/h2>\n
\u4f7f\u7528yarn\u5c06\u8f6f\u4ef6\u5305\u6ce8\u518c\u3002
\n\u4f3c\u4e4e\u8fd8\u4f1a\u4e00\u540c\u6ce8\u518cTypeScript\u7684\u7c7b\u578b\u3002<\/p>\n
$ <\/span>yarn add aws-amplify aws-amplify-react\r\n<\/code><\/pre>\n
\u5e94\u7528\u7a0b\u5e8f\u7684\u5347\u7ea7<\/h2>\n
\u9996\u5148\uff0c\u6211\u4eec\u5c06\u4fee\u6539\u7531create-react-app\u81ea\u52a8\u751f\u6210\u7684\u4ee3\u7801\u3002\u63a5\u4e0b\u6765\u662fAmplify\u7684\u521d\u59cb\u5316\u90e8\u5206\u3002<\/p>\n
import<\/span> React<\/span> from<\/span> '<\/span>react<\/span>'<\/span>;<\/span>\r\nimport<\/span> ReactDOM<\/span> from<\/span> '<\/span>react-dom<\/span>'<\/span>;<\/span>\r\nimport<\/span> '<\/span>.\/index.css<\/span>'<\/span>;<\/span>\r\nimport<\/span> App<\/span> from<\/span> '<\/span>.\/App<\/span>'<\/span>;<\/span>\r\nimport<\/span> *<\/span> as<\/span> serviceWorker<\/span> from<\/span> '<\/span>.\/serviceWorker<\/span>'<\/span>;<\/span>\r\nimport<\/span> Amplify<\/span> from<\/span> \"<\/span>aws-amplify<\/span>\"<\/span>  \/\/ \u8ffd\u52a0<\/span>\r\nimport<\/span> config<\/span> from<\/span> \"<\/span>.\/aws-exports<\/span>\"<\/span> \/\/ \u8ffd\u52a0<\/span>\r\nAmplify<\/span>.<\/span>configure<\/span>(<\/span>config<\/span>)<\/span>          \/\/ \u8ffd\u52a0<\/span>\r\n\r\nReactDOM<\/span>.<\/span>render<\/span>(<<\/span>App<\/span> \/>,<\/span> document<\/span>.<\/span>getElementById<\/span>(<\/span>'<\/span>root<\/span>'<\/span>));<\/span>\r\n\r\n\/\/ If you want your app to work offline and load faster, you can change<\/span>\r\n\/\/ unregister() to register() below. Note this comes with some pitfalls.<\/span>\r\n\/\/ Learn more about service workers: https:\/\/bit.ly\/CRA-PWA<\/span>\r\nserviceWorker<\/span>.<\/span>unregister<\/span>();<\/span>\r\n<\/code><\/pre>\n
\u63a5\u4e0b\u6765\u662f\u5e94\u7528\u7a0b\u5e8f\u672c\u8eab\u3002\u5173\u952e\u70b9\u7a0d\u540e\u5c06\u4f1a\u89e3\u91ca\u3002
\n\u53e6\u5916\uff0c\u7531\u4e8e\u4e3b\u8981\u76ee\u7684\u662f\u7406\u89e3\u6d41\u7a0b\uff0c\u6240\u4ee5\u6ca1\u6709\u8fdb\u884c\u9519\u8bef\u5904\u7406\u3002<\/p>\n
import<\/span> React<\/span>,<\/span> {<\/span> useEffect<\/span>,<\/span> useState<\/span> }<\/span> from<\/span> \"<\/span>react<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> API<\/span>,<\/span> graphqlOperation<\/span> }<\/span> from<\/span> \"<\/span>aws-amplify<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> listPosts<\/span> }<\/span> from<\/span> \"<\/span>.\/graphql\/queries<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> createPost<\/span> }<\/span> from<\/span> \"<\/span>.\/graphql\/mutations<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span> onCreatePost<\/span> }<\/span> from<\/span> \"<\/span>.\/graphql\/subscriptions<\/span>\"<\/span>;<\/span>\r\nimport<\/span> {<\/span>\r\n  ListPostsQuery<\/span>,<\/span>\r\n  OnCreatePostSubscription<\/span>,<\/span>\r\n  CreatePostMutationVariables<\/span>\r\n}<\/span> from<\/span> \"<\/span>.\/API<\/span>\"<\/span>;<\/span>\r\n\r\ntype<\/span> Post<\/span> =<\/span> {<\/span>\r\n  id<\/span>:<\/span> string<\/span>;<\/span>\r\n  title<\/span>:<\/span> string<\/span>;<\/span>\r\n  content<\/span>:<\/span> string<\/span>;<\/span>\r\n  price<\/span>:<\/span> number<\/span> |<\/span> null<\/span>;<\/span>\r\n  rating<\/span>:<\/span> number<\/span> |<\/span> null<\/span>;<\/span>\r\n};<\/span>\r\n\r\ntype<\/span> FormState<\/span> =<\/span> {<\/span>\r\n  title<\/span>:<\/span> string<\/span>;<\/span>\r\n  content<\/span>:<\/span> string<\/span>;<\/span>\r\n};<\/span>\r\n\r\ntype<\/span> PostSubscriptionEvent<\/span> =<\/span> {<\/span> value<\/span>:<\/span> {<\/span> data<\/span>:<\/span> OnCreatePostSubscription<\/span> }<\/span> };<\/span>\r\n\r\nconst<\/span> usePosts<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>posts<\/span>,<\/span> setPosts<\/span>]<\/span> =<\/span> useState<\/span><<\/span>Post<\/span>[]<\/span>><\/span>([]);<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    (<\/span>async<\/span> ()<\/span> =><\/span> {<\/span>\r\n      \/\/ \u6700\u521d\u306ePost\u4e00\u89a7\u53d6\u5f97<\/span>\r\n      const<\/span> result<\/span> =<\/span> await<\/span> API<\/span>.<\/span>graphql<\/span>(<\/span>graphqlOperation<\/span>(<\/span>listPosts<\/span>));<\/span>\r\n      if<\/span> (<\/span>\"<\/span>data<\/span>\"<\/span> in<\/span> result<\/span> &&<\/span> result<\/span>.<\/span>data<\/span>)<\/span> {<\/span>\r\n        const<\/span> posts<\/span> =<\/span> result<\/span>.<\/span>data<\/span> as<\/span> ListPostsQuery<\/span>;<\/span>\r\n        if<\/span> (<\/span>posts<\/span>.<\/span>listPosts<\/span>)<\/span> {<\/span>\r\n          setPosts<\/span>(<\/span>posts<\/span>.<\/span>listPosts<\/span>.<\/span>items<\/span> as<\/span> Post<\/span>[]);<\/span>\r\n        }<\/span>\r\n      }<\/span>\r\n\r\n      \/\/ Post\u8ffd\u52a0\u30a4\u30d9\u30f3\u30c8\u306e\u8cfc\u8aad<\/span>\r\n      const<\/span> client<\/span> =<\/span> API<\/span>.<\/span>graphql<\/span>(<\/span>graphqlOperation<\/span>(<\/span>onCreatePost<\/span>));<\/span>\r\n      if<\/span> (<\/span>\"<\/span>subscribe<\/span>\"<\/span> in<\/span> client<\/span>)<\/span> {<\/span>\r\n        client<\/span>.<\/span>subscribe<\/span>({<\/span>\r\n          next<\/span>:<\/span> ({<\/span> value<\/span>:<\/span> {<\/span> data<\/span> }<\/span> }:<\/span> PostSubscriptionEvent<\/span>)<\/span> =><\/span> {<\/span>\r\n            if<\/span> (<\/span>data<\/span>.<\/span>onCreatePost<\/span>)<\/span> {<\/span>\r\n              const<\/span> post<\/span>:<\/span> Post<\/span> =<\/span> data<\/span>.<\/span>onCreatePost<\/span>;<\/span>\r\n              setPosts<\/span>(<\/span>prev<\/span> =><\/span> [...<\/span>prev<\/span>,<\/span> post<\/span>]);<\/span>\r\n            }<\/span>\r\n          }<\/span>\r\n        });<\/span>\r\n      }<\/span>\r\n    })();<\/span>\r\n  },<\/span> []);<\/span>\r\n\r\n  return<\/span> posts<\/span>;<\/span>\r\n};<\/span>\r\n\r\nconst<\/span> App<\/span>:<\/span> React<\/span>.<\/span>FC<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>input<\/span>,<\/span> setInput<\/span>]<\/span> =<\/span> useState<\/span><<\/span>FormState<\/span>><\/span>({<\/span>\r\n    title<\/span>:<\/span> \"\"<\/span>,<\/span>\r\n    content<\/span>:<\/span> \"\"<\/span>\r\n  });<\/span>\r\n  const<\/span> posts<\/span> =<\/span> usePosts<\/span>();<\/span>\r\n\r\n  const<\/span> onFormChange<\/span> =<\/span> ({<\/span>\r\n    target<\/span>:<\/span> {<\/span> name<\/span>,<\/span> value<\/span> }<\/span>\r\n  }:<\/span> React<\/span>.<\/span>ChangeEvent<\/span><<\/span>HTMLInputElement<\/span>><\/span>)<\/span> =><\/span> {<\/span>\r\n    setInput<\/span>(<\/span>prev<\/span> =><\/span> ({<\/span> ...<\/span>prev<\/span>,<\/span> [<\/span>name<\/span>]:<\/span> value<\/span> }));<\/span>\r\n  };<\/span>\r\n\r\n  const<\/span> onPost<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    if<\/span> (<\/span>input<\/span>.<\/span>title<\/span> ===<\/span> \"\"<\/span> ||<\/span> input<\/span>.<\/span>content<\/span> ===<\/span> \"\"<\/span>)<\/span> return<\/span>;<\/span>\r\n    const<\/span> newPost<\/span>:<\/span> CreatePostMutationVariables<\/span> =<\/span> {<\/span>\r\n      input<\/span>:<\/span> {<\/span>\r\n        title<\/span>:<\/span> input<\/span>.<\/span>title<\/span>,<\/span>\r\n        content<\/span>:<\/span> input<\/span>.<\/span>content<\/span>\r\n      }<\/span>\r\n    };<\/span>\r\n    setInput<\/span>({<\/span> title<\/span>:<\/span> \"\"<\/span>,<\/span> content<\/span>:<\/span> \"\"<\/span> });<\/span>\r\n    API<\/span>.<\/span>graphql<\/span>(<\/span>graphqlOperation<\/span>(<\/span>createPost<\/span>,<\/span> newPost<\/span>));<\/span>\r\n  };<\/span>\r\n\r\n  return<\/span> (<\/span>\r\n    <<\/span>div<\/span> className<\/span>=<\/span>\"App\"<\/span>><\/span>\r\n      <<\/span>div<\/span>><\/span>\r\n        \u30bf\u30a4\u30c8\u30eb\r\n        <<\/span>input<\/span> value<\/span>=<\/span>{<\/span>input<\/span>.<\/span>title<\/span>}<\/span> name<\/span>=<\/span>\"title\"<\/span> onChange<\/span>=<\/span>{<\/span>onFormChange<\/span>}<\/span> \/><\/span>\r\n      <\/<\/span>div<\/span>><\/span>\r\n      <<\/span>div<\/span>><\/span>\r\n        \u5185\u5bb9\r\n        <<\/span>input<\/span> value<\/span>=<\/span>{<\/span>input<\/span>.<\/span>content<\/span>}<\/span> name<\/span>=<\/span>\"content\"<\/span> onChange<\/span>=<\/span>{<\/span>onFormChange<\/span>}<\/span> \/><\/span>\r\n      <\/<\/span>div<\/span>><\/span>\r\n      <<\/span>button<\/span> onClick<\/span>=<\/span>{<\/span>onPost<\/span>}<\/span>><\/span>\u8ffd\u52a0<\/<\/span>button<\/span>><\/span>\r\n      <<\/span>div<\/span>><\/span>\r\n        {<\/span>posts<\/span>.<\/span>map<\/span>(<\/span>data<\/span> =><\/span> {<\/span>\r\n          return<\/span> (<\/span>\r\n            <<\/span>div<\/span> key<\/span>=<\/span>{<\/span>data<\/span>.<\/span>id<\/span>}<\/span>><\/span>\r\n              <<\/span>h4<\/span>><\/span>{<\/span>data<\/span>.<\/span>title<\/span>}<\/span><\/<\/span>h4<\/span>><\/span>\r\n              <<\/span>p<\/span>><\/span>{<\/span>data<\/span>.<\/span>content<\/span>}<\/span><\/<\/span>p<\/span>><\/span>\r\n            <\/<\/span>div<\/span>><\/span>\r\n          );<\/span>\r\n        })<\/span>}<\/span>\r\n      <\/<\/span>div<\/span>><\/span>\r\n    <\/<\/span>div<\/span>><\/span>\r\n  );<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> default<\/span> App<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5269\u4e0b\u7684\u5c31\u53ea\u662f\u542f\u52a8\u4e86\u3002<\/p>\n
$ <\/span>yarn start\r\n<\/code><\/pre>\n
\"board.png\"<\/div>\n
\u5f53\u6253\u5f00\u591a\u4e2a\u753b\u9762\u65f6\uff0c\u5b83\u4eec\u5c06\u540c\u65f6\u5b9e\u65f6\u66f4\u65b0\u3002<\/p>\n
\u89e3\u91ca\u548c\u611f\u60f3<\/h2>\n
\u6a21\u7279\u513f<\/h3>\n
\u7531\u4e8e\u5728src\/API.ts\u4e2d\u81ea\u52a8\u751f\u6210\u4e86\u4e0egraphql\u6a21\u5f0f\u5339\u914d\u7684\u7c7b\u578b\uff0c\u56e0\u6b64\u57fa\u672c\u4e0a\u4f7f\u7528\u5728\u8fd9\u91cc\u5b9a\u4e49\u7684\u7c7b\u578b\u3002<\/p>\n
export<\/span> type<\/span> ListPostsQuery<\/span> =<\/span> {<\/span>\r\n  listPosts<\/span>:<\/span>  {<\/span>\r\n    __typename<\/span>:<\/span> \"<\/span>ModelPostConnection<\/span>\"<\/span>,<\/span>\r\n    items<\/span>:<\/span>  Array<\/span><<\/span> {<\/span>\r\n      __typename<\/span>:<\/span> \"<\/span>Post<\/span>\"<\/span>,<\/span>\r\n      id<\/span>:<\/span> string<\/span>,<\/span>\r\n      title<\/span>:<\/span> string<\/span>,<\/span>\r\n      content<\/span>:<\/span> string<\/span>,<\/span>\r\n      price<\/span>:<\/span> number<\/span> |<\/span> null<\/span>,<\/span>\r\n      rating<\/span>:<\/span> number<\/span> |<\/span> null<\/span>,<\/span>\r\n    }<\/span> |<\/span> null<\/span> ><\/span> |<\/span> null<\/span>,<\/span>\r\n    nextToken<\/span>:<\/span> string<\/span> |<\/span> null<\/span>,<\/span>\r\n  }<\/span> |<\/span> null<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> type<\/span> OnUpdatePostSubscription<\/span> =<\/span> {<\/span>\r\n  onUpdatePost<\/span>:<\/span>  {<\/span>\r\n    __typename<\/span>:<\/span> \"<\/span>Post<\/span>\"<\/span>,<\/span>\r\n    id<\/span>:<\/span> string<\/span>,<\/span>\r\n    title<\/span>:<\/span> string<\/span>,<\/span>\r\n    content<\/span>:<\/span> string<\/span>,<\/span>\r\n    price<\/span>:<\/span> number<\/span> |<\/span> null<\/span>,<\/span>\r\n    rating<\/span>:<\/span> number<\/span> |<\/span> null<\/span>,<\/span>\r\n  }<\/span> |<\/span> null<\/span>,<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u7531\u4e8ePost\u4e2d\u6ca1\u6709\u4ec5\u5305\u542b\u5185\u5bb9\u7684\u7c7b\u578b\uff0c\u56e0\u6b64\u6211\u4eec\u81ea\u884c\u5b9a\u4e49\u5982\u4e0b\u3002<\/p>\n
type<\/span> Post<\/span> =<\/span> {<\/span>\r\n  id<\/span>:<\/span> string<\/span>;<\/span>\r\n  title<\/span>:<\/span> string<\/span>;<\/span>\r\n  content<\/span>:<\/span> string<\/span>;<\/span>\r\n  price<\/span>:<\/span> number<\/span> |<\/span> null<\/span>;<\/span>\r\n  rating<\/span>:<\/span> number<\/span> |<\/span> null<\/span>;<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u7531\u4e8eGraphQL\u7684\u67b6\u6784\u662f\u539f\u59cb\u7684\uff0c\u6240\u4ee5\u6211\u4e5f\u5e0c\u671b\u80fd\u81ea\u52a8\u751f\u6210\u3002<\/p>\n
\u6ce8\u518c<\/h2>\n
\u8fd9\u4e2a\u65b9\u6cd5\u662f\u5728\u70b9\u51fb\u8ffd\u52a0\u6309\u94ae\u65f6\u8c03\u7528\u7684\u3002<\/p>\n
  const<\/span> onPost<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n    if<\/span> (<\/span>input<\/span>.<\/span>title<\/span> ===<\/span> \"\"<\/span> ||<\/span> input<\/span>.<\/span>content<\/span> ===<\/span> \"\"<\/span>)<\/span> return<\/span>;<\/span>\r\n    const<\/span> newPost<\/span>:<\/span> CreatePostMutationVariables<\/span> =<\/span> {<\/span>\r\n      input<\/span>:<\/span> {<\/span>\r\n        title<\/span>:<\/span> input<\/span>.<\/span>title<\/span>,<\/span>\r\n        content<\/span>:<\/span> input<\/span>.<\/span>content<\/span>\r\n      }<\/span>\r\n    };<\/span>\r\n    setInput<\/span>({<\/span> title<\/span>:<\/span> \"\"<\/span>,<\/span> content<\/span>:<\/span> \"\"<\/span> });<\/span>\r\n    API<\/span>.<\/span>graphql<\/span>(<\/span>graphqlOperation<\/span>(<\/span>createPost<\/span>,<\/span> newPost<\/span>));<\/span>\r\n  };<\/span>\r\n<\/code><\/pre>\n
\u7531\u4e8eGraphQL\u81ea\u52a8\u751f\u6210\u4e86\u4ee3\u8868\u6027\u7684\u67e5\u8be2\uff0c\u60a8\u53ef\u4ee5\u901a\u8fc7\u5c06\u5176\u6307\u5b9a\u4e3agraphqlOperation\u6765\u5207\u6362\u67e5\u8be2\u7c7b\u578b\u3002\u5728\u8fd9\u91cc\uff0c\u7531\u4e8e\u662f\u8fdb\u884c\u65b0\u7684\u6ce8\u518c\uff0c\u6240\u4ee5\u6211\u4eec\u4f7f\u7528createPost\u3002<\/p>\n
export<\/span> const<\/span> createPost<\/span> =<\/span> `mutation CreatePost($input: CreatePostInput!) {\r\n  createPost(input: $input) {\r\n    id\r\n    title\r\n    content\r\n    price\r\n    rating\r\n  }\r\n}\r\n`<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u53ea\u9700\u8bbe\u7f6e\u8981\u6ce8\u518c\u7684\u6570\u636e\u5e76\u53d1\u9001\u67e5\u8be2\uff0c\u56e0\u4e3a\u5df2\u81ea\u52a8\u751f\u6210\u4e86\u4e0e\u8ffd\u52a0\u53c2\u6570$input: CreatePostInput!\u5bf9\u5e94\u7684\u7c7b\u578b\u3002<\/p>\n
export<\/span> type<\/span> CreatePostInput<\/span> =<\/span> {<\/span>\r\n  id<\/span>?:<\/span> string<\/span> |<\/span> null<\/span>,<\/span>\r\n  title<\/span>:<\/span> string<\/span>,<\/span>\r\n  content<\/span>:<\/span> string<\/span>,<\/span>\r\n  price<\/span>?:<\/span> number<\/span> |<\/span> null<\/span>,<\/span>\r\n  rating<\/span>?:<\/span> number<\/span> |<\/span> null<\/span>,<\/span>\r\n};<\/span>\r\n\r\nexport<\/span> type<\/span> CreatePostMutationVariables<\/span> =<\/span> {<\/span>\r\n  input<\/span>:<\/span> CreatePostInput<\/span>,<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u76d1\u63a7\u4e00\u89c8\u6570\u636e\u83b7\u53d6\u548c\u6570\u636e\u6ce8\u518c<\/h3>\n
\u901a\u8fc7\u521b\u5efa\u81ea\u5b9a\u4e49\u94a9\u5b50\u5b9e\u73b0\u6ce8\u518c\u6570\u636e\u7684\u5217\u8868\u83b7\u53d6\u548c\u65b0\u589e\u6570\u636e\u7684\u76d1\u89c6\u3002<\/p>\n
\u901a\u8fc7\u5728\u7ec4\u4ef6\u6302\u8f7d\u65f6\u4f7f\u7528 useEffect\uff0c\u5728\u987a\u5e8f\u4e0a\u6dfb\u52a0\u83b7\u53d6\u5e16\u5b50\u5217\u8868\u548c\u521b\u5efa\u5e16\u5b50\u7684\u8ba2\u9605\uff0c\u7136\u540e\u4f7f\u7528 useState \u8fd4\u56de\u521b\u5efa\u7684\u5e16\u5b50\u5217\u8868\u4f5c\u4e3a\u8fd4\u56de\u503c\uff0c\u4ee5\u4f20\u8fbe\u5e16\u5b50\u5217\u8868\u7684\u66f4\u65b0\u3002<\/p>\n
type<\/span> PostSubscriptionEvent<\/span> =<\/span> {<\/span> value<\/span>:<\/span> {<\/span> data<\/span>:<\/span> OnCreatePostSubscription<\/span> }<\/span> };<\/span>\r\n\r\nconst<\/span> usePosts<\/span> =<\/span> ()<\/span> =><\/span> {<\/span>\r\n  const<\/span> [<\/span>posts<\/span>,<\/span> setPosts<\/span>]<\/span> =<\/span> useState<\/span><<\/span>Post<\/span>[]<\/span>><\/span>([]);<\/span>\r\n\r\n  useEffect<\/span>(()<\/span> =><\/span> {<\/span>\r\n    (<\/span>async<\/span> ()<\/span> =><\/span> {<\/span>\r\n      \/\/ \u6700\u521d\u306ePost\u4e00\u89a7\u53d6\u5f97<\/span>\r\n      const<\/span> result<\/span> =<\/span> await<\/span> API<\/span>.<\/span>graphql<\/span>(<\/span>graphqlOperation<\/span>(<\/span>listPosts<\/span>));<\/span>\r\n      if<\/span> (<\/span>\"<\/span>data<\/span>\"<\/span> in<\/span> result<\/span> &&<\/span> result<\/span>.<\/span>data<\/span>)<\/span> {<\/span>\r\n        const<\/span> posts<\/span> =<\/span> result<\/span>.<\/span>data<\/span> as<\/span> ListPostsQuery<\/span>;<\/span>\r\n        if<\/span> (<\/span>posts<\/span>.<\/span>listPosts<\/span>)<\/span> {<\/span>\r\n          setPosts<\/span>(<\/span>posts<\/span>.<\/span>listPosts<\/span>.<\/span>items<\/span> as<\/span> Post<\/span>[]);<\/span>\r\n        }<\/span>\r\n      }<\/span>\r\n\r\n      \/\/ Post\u8ffd\u52a0\u30a4\u30d9\u30f3\u30c8\u306e\u8cfc\u8aad<\/span>\r\n      const<\/span> client<\/span> =<\/span> API<\/span>.<\/span>graphql<\/span>(<\/span>graphqlOperation<\/span>(<\/span>onCreatePost<\/span>));<\/span>\r\n      if<\/span> (<\/span>\"<\/span>subscribe<\/span>\"<\/span> in<\/span> client<\/span>)<\/span> {<\/span>\r\n        client<\/span>.<\/span>subscribe<\/span>({<\/span>\r\n          next<\/span>:<\/span> ({<\/span> value<\/span>:<\/span> {<\/span> data<\/span> }<\/span> }:<\/span> PostSubscriptionEvent<\/span>)<\/span> =><\/span> {<\/span>\r\n            if<\/span> (<\/span>data<\/span>.<\/span>onCreatePost<\/span>)<\/span> {<\/span>\r\n              const<\/span> post<\/span>:<\/span> Post<\/span> =<\/span> data<\/span>.<\/span>onCreatePost<\/span>;<\/span>\r\n              setPosts<\/span>(<\/span>prev<\/span> =><\/span> [...<\/span>prev<\/span>,<\/span> post<\/span>]);<\/span>\r\n            }<\/span>\r\n          }<\/span>\r\n        });<\/span>\r\n      }<\/span>\r\n    })();<\/span>\r\n  },<\/span> []);<\/span>\r\n\r\n  return<\/span> posts<\/span>;<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u4e3a\u4e86\u786e\u4fdd\u7c7b\u578b\u7684\u4e00\u81f4\u6027\uff0c\u8fd9\u6709\u70b9\u590d\u6742\u3002<\/p>\n
API.graphql\u7684\u8fd4\u56de\u7c7b\u578b\u662fPromise | Observable\u3002\u6839\u636egraphqlOperation\u7684\u53c2\u6570\u5185\u5bb9\uff0c\u8fd4\u56de\u7c7b\u578b\u4f1a\u53d1\u751f\u53d8\u5316\u3002\u7531\u4e8e\u8fd4\u56de\u503c\u7684\u6570\u636e\u7c7b\u578b\u662fobject\uff0c\u5e76\u4e14\u65e0\u6cd5\u901a\u8fc7\u6cdb\u578b\u8fdb\u884c\u6307\u5b9a\uff0c\u56e0\u6b64\u9700\u8981\u4f7f\u7528if\u8bed\u53e5\u5728\u67d0\u4e9b\u5730\u65b9\u8fdb\u884c\u7c7b\u578b\u7f29\u5c0f\uff0c\u6216\u8005\u4f7f\u7528as\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u3002\u4e5f\u8bb8\u8fd8\u6709\u66f4\u597d\u7684\u65b9\u6cd5\u4f7f\u7528\u5b83\uff0c\u4f46\u6211\u5e0c\u671b\u5b83\u80fd\u66f4\u52a0\u65b9\u4fbf\u4e00\u4e9b\u3002<\/p>\n
\u6700\u540e<\/h2>\n
\u8d77\u521d\u6211\u5f88\u96be\u6293\u4f4f\u6574\u4f53\u7684\u6982\u5ff5\uff0c\u4f46\u5b9e\u9645\u4f7f\u7528\u8d77\u6765\uff0cGraphQL\u7684API\u6bd4\u6211\u60f3\u8c61\u7684\u8fd8\u8981\u5bb9\u6613\u5efa\u7acb\u3002\u9664\u4e86DynamoDB\uff0c\u5b83\u8fd8\u53ef\u4ee5\u4e0eRDB\u548cLambda\u8fdb\u884c\u8fde\u63a5\uff0c\u4f3c\u4e4e\u53ef\u4ee5\u6709\u8bb8\u591a\u5e94\u7528\uff0c\u5e76\u4e14\u975e\u5e38\u65b9\u4fbf\u3002<\/object><\/p>\n","protected":false},"excerpt":{"rendered":"
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