{"id":48080,"date":"2023-03-18T15:30:16","date_gmt":"2024-02-08T15:54:15","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8nest-js%e7%9a%84graphql%e4%b8%ad%e8%bd%bb%e6%9d%be%e5%ae%9e%e7%8e%b0%e7%bc%93%e5%ad%98\/"},"modified":"2024-04-29T19:28:30","modified_gmt":"2024-04-29T11:28:30","slug":"%e5%9c%a8nest-js%e7%9a%84graphql%e4%b8%ad%e8%bd%bb%e6%9d%be%e5%ae%9e%e7%8e%b0%e7%bc%93%e5%ad%98","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%9c%a8nest-js%e7%9a%84graphql%e4%b8%ad%e8%bd%bb%e6%9d%be%e5%ae%9e%e7%8e%b0%e7%bc%93%e5%ad%98\/","title":{"rendered":"\u5728Nest.js\u7684GraphQL\u4e2d\u8f7b\u677e\u5b9e\u73b0\u7f13\u5b58"},"content":{"rendered":"

\u6211\u8ba4\u4e3a\u5728GraphQL\u4e2d\u5f15\u5165\u7f13\u5b58\u673a\u5236\u7684\u6700\u4f73\u9009\u62e9\u53ef\u80fd\u662f\u4f7f\u7528DataLoader\uff0c\u4f46\u662f\u5728nest.js\u4e2d\u5c1a\u672a\u5efa\u7acbDalaloader\u7684\u4f7f\u7528\u65b9\u6cd5\u3002<\/p>\n

\u203b 2020\/01\/20 \u8ffd\u52a0
\n\u6211\u5199\u4e86\u4e00\u7bc7\u5173\u4e8e\u5982\u4f55\u5728 @nestjs\/graphql \u4e2d\u4f7f\u7528dataloader\u7684\u65b9\u6cd5\u3002<\/p>\n

\u53c2\u8003\u95ee\u9898\uff1a
\nhttps:\/\/github.com\/nestjs\/graphql\/issues\/20
\nhttps:\/\/github.com\/nestjs\/graphql\/issues\/2<\/p>\n

\u9664\u4e86DataLoader\u4e4b\u5916\uff0cnest.js\u8fd8\u63d0\u4f9b\u4e86\u4f7f\u7528cache-manager\u7684CacheModule\u3002\u4e0d\u8fc7\uff0c\u7f3a\u5c11\u5728GraphQL\u4e2d\u4f7f\u7528\u7684\u793a\u4f8b\uff0c\u5e76\u4e14\u5728\u6211\u7684\u73af\u5883\u4e2d\u4e5f\u65e0\u6cd5\u6b63\u5e38\u8fd0\u884c\uff0c\u6240\u4ee5\u770b\u8d77\u6765\u4e0d\u53d7\u652f\u6301\u3002
\nhttps:\/\/docs.nestjs.com\/techniques\/caching<\/p>\n

\u76ee\u524d\uff0c\u5728nest.js\u4e2d\uff0c\u7f13\u5b58\u673a\u5236\u5c1a\u672a\u5b8c\u5168\u5efa\u7acb\u8d77\u6765\uff0c\u5e76\u4e14\u6211\u8ba4\u4e3a\u672a\u6765\u53ef\u80fd\u4f1a\u53d1\u751f\u91cd\u5927\u53d8\u5316\uff0c\u56e0\u6b64\u6211\u8ba1\u5212\u4e0d\u4f7f\u7528DataLoader\u6216cache-manager\uff0c\u800c\u662f\u81ea\u884c\u5b9e\u73b0\u7f13\u5b58\u673a\u5236\u3002<\/p>\n

\u7f13\u5b58\u5730\u56fe<\/h2>\n

\u4f7f\u7528Custom Decorator\u7684\u529f\u80fd\uff0c\u5c06map\u4fdd\u5b58\u5728context\u4e2d\u3002\u7531\u4e8e\u6570\u636e\u4fdd\u5b58\u5728context\u4e2d\uff0c\u56e0\u6b64\u6570\u636e\u5c06\u4ec5\u5728\u4e00\u4e2a\u8bf7\u6c42\u7684\u671f\u95f4\u5185\u4fdd\u6301\u3002\u5c31\u50cfDataLoader\u4e00\u6837\u3002
\nhttps:\/\/docs.nestjs.com\/graphql\/tooling#custom-decorators<\/p>\n

export<\/span> const<\/span> CacheMap<\/span> =<\/span> createParamDecorator<\/span>(<\/span>\r\n  (<\/span>key<\/span>:<\/span> string<\/span> =<\/span> '<\/span>default<\/span>'<\/span>,<\/span> [<\/span>root<\/span>,<\/span> args<\/span>,<\/span> ctx<\/span>,<\/span> info<\/span>])<\/span> =><\/span> {<\/span>\r\n\r\n    if<\/span> (<\/span>!<\/span>ctx<\/span>.<\/span>cacheMap<\/span>)<\/span> {<\/span>\r\n      ctx<\/span>.<\/span>cacheMap<\/span> =<\/span> {}<\/span> as<\/span> {<\/span> [<\/span>key<\/span>:<\/span> string<\/span>]:<\/span> Map<\/span><<\/span>string<\/span>,<\/span> any<\/span>><\/span> };<\/span>\r\n    }<\/span>\r\n\r\n    if<\/span> (<\/span>!<\/span>ctx<\/span>.<\/span>cacheMap<\/span>[<\/span>key<\/span>])<\/span> {<\/span>\r\n      ctx<\/span>.<\/span>cacheMap<\/span>[<\/span>key<\/span>]<\/span> =<\/span> new<\/span> Map<\/span><<\/span>string<\/span>,<\/span> any<\/span>><\/span>();<\/span>\r\n    }<\/span>\r\n    return<\/span> ctx<\/span>.<\/span>cacheMap<\/span>[<\/span>key<\/span>];<\/span>\r\n  },<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u4f7f\u7528\u65b9\u6cd5<\/h3>\n
\u4f7f\u7528\u65b9\u6cd5\u975e\u5e38\u7b80\u5355\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\u521b\u5efa\u4e86\u4e00\u4e2a\u7b80\u5355\u7684\u7f13\u5b58\u673a\u5236\u3002<\/p>\n
@<\/span>Resolver<\/span>(<\/span>'<\/span>Query<\/span>'<\/span>)<\/span>\r\nexport<\/span> class<\/span> QueryResolver<\/span> {<\/span>\r\n  constructor<\/span>(<\/span>private<\/span> readonly<\/span> service<\/span>:<\/span> Service<\/span>)<\/span> {}<\/span>\r\n\r\n  @<\/span>ResolveProperty<\/span>()<\/span>\r\n  public<\/span> async<\/span> users<\/span>(@<\/span>CacheMap<\/span>()<\/span> cache<\/span>:<\/span> Map<\/span><<\/span>string<\/span>,<\/span> User<\/span>[]<\/span>><\/span>):<\/span> Promise<\/span><<\/span>User<\/span>[]<\/span>><\/span> {<\/span>\r\n\r\n    const<\/span> cacheKey<\/span> =<\/span> `users`<\/span>;<\/span>\r\n\r\n    const<\/span> users<\/span> =<\/span> cache<\/span>.<\/span>has<\/span>(<\/span>cacheKey<\/span>)<\/span>\r\n      ?<\/span> cache<\/span>.<\/span>get<\/span>(<\/span>cacheKey<\/span>)<\/span>!<\/span>\r\n      :<\/span> await<\/span> this<\/span>.<\/span>service<\/span>.<\/span>find<\/span>();<\/span>\r\n\r\n    cache<\/span>.<\/span>set<\/span>(<\/span>cacheKey<\/span>,<\/span> users<\/span>);<\/span>\r\n\r\n    return<\/span> users<\/span>;<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6211\u5011\u8981\u8a0e\u8ad6\u7684\u7b2c\u4e00\u500b\u8a71\u984c\u662f<\/h2>\n
\u6211\u4eec\u53ef\u4ee5\u50cfCacheModule\u4e00\u6837\u4f7f\u7528\u62e6\u622a\u5668\u8fdb\u884c\u7f13\u5b58\uff0c\u4f46\u7531\u4e8eGraphQL\u901a\u5e38\u5728\u67e5\u8be2\u4e2d\u4f7f\u7528relay\u3001filter\u3001orderBy\u7b49\u8fdb\u884c\u5904\u7406\uff0c\u56e0\u6b64\u51b3\u5b9a\u5bf9\u8fd4\u56de\u503c\u8fdb\u884c\u7f13\u5b58\u4f1a\u88ab\u89c6\u4e3a\u65e0\u6548\u7684\u3002<\/p>\n
@<\/span>Resolver<\/span>(<\/span>'<\/span>Query<\/span>'<\/span>)<\/span>\r\nexport<\/span> class<\/span> QueryResolver<\/span> {<\/span>\r\n  constructor<\/span>(<\/span>private<\/span> readonly<\/span> service<\/span>:<\/span> Service<\/span>)<\/span> {}<\/span>\r\n\r\n  @<\/span>ResolveProperty<\/span>()<\/span>\r\n  public<\/span> async<\/span> users<\/span>(<\/span>\r\n    @<\/span>ConnectionArgs<\/span>()<\/span> connectionArgs<\/span>:<\/span> ConnectionArguments<\/span>,<\/span>\r\n    @<\/span>CacheMap<\/span>()<\/span> cache<\/span>:<\/span> Map<\/span><<\/span>string<\/span>,<\/span> User<\/span>[]<\/span>><\/span>):<\/span> Promise<\/span><<\/span>User<\/span>[]<\/span>><\/span> {<\/span>\r\n\r\n    const<\/span> cacheKey<\/span> =<\/span> `users`<\/span>;<\/span>\r\n\r\n    const<\/span> users<\/span> =<\/span> cache<\/span>.<\/span>has<\/span>(<\/span>cacheKey<\/span>)<\/span>\r\n      ?<\/span> cache<\/span>.<\/span>get<\/span>(<\/span>cacheKey<\/span>)<\/span>!<\/span>\r\n      :<\/span> await<\/span> this<\/span>.<\/span>service<\/span>.<\/span>find<\/span>();<\/span>\r\n\r\n    cache<\/span>.<\/span>set<\/span>(<\/span>cacheKey<\/span>,<\/span> users<\/span>);<\/span>\r\n    \/\/ \u5b9f\u969b\u306f\u3053\u3053\u3067\u66f4\u306b\u52a0\u5de5<\/span>\r\n    \/\/ https:\/\/www.npmjs.com\/package\/graphql-relay \u306e connectionFromArray \u3092\u4f7f\u3063\u305f\u308a\u3057\u3066\u308b<\/span>\r\n    return<\/span> connectionFromArray<\/span>(<\/span>users<\/span>,<\/span> connectionArgs<\/span>);<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u53e6\u5916\u8c08\u8c08\u7b2c\u4e8c\u70b9<\/h2>\n
\u7531\u4e8e\u4f7f\u7528\u522b\u540d\u7684\u76f8\u540c\u67e5\u8be2\u4e0d\u4f1a\u542f\u7528\u7f13\u5b58\uff0c\u6240\u4ee5\u6211\u8fd8\u662f\u5e0c\u671b\u6709\u4e00\u4e2aDataLoader…<\/p>\n
query<\/span> getUsers<\/span> {<\/span>\r\n  admins<\/span>:<\/span> users<\/span>(<\/span>role<\/span>:<\/span> admin<\/span>)<\/span> {<\/span>\r\n    id<\/span>\r\n    firstName<\/span>\r\n    lastName<\/span>\r\n    phone<\/span>\r\n    username<\/span>\r\n  }<\/span>\r\n  accountants<\/span>:<\/span> users<\/span>(<\/span>role<\/span>:<\/span> accountant<\/span>)<\/span> {<\/span>\r\n    id<\/span>\r\n    firstName<\/span>\r\n    lastName<\/span>\r\n    phone<\/span>\r\n    username<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
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