{"id":48103,"date":"2023-05-05T04:37:26","date_gmt":"2023-09-13T14:44:09","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%bd%93%e6%88%91%e5%b0%9d%e8%af%95%e5%b0%86%e6%a8%a1%e5%bc%8f%e5%90%88%e5%b9%b6%e5%9c%a8graphql-mesh%e4%b8%ad%e6%97%b6%ef%bc%8c%e9%81%87%e5%88%b0%e4%ba%86%e5%be%88%e5%a4%a7%e7%9a%84%e5%9b%b0\/"},"modified":"2024-04-30T02:41:26","modified_gmt":"2024-04-29T18:41:26","slug":"%e5%bd%93%e6%88%91%e5%b0%9d%e8%af%95%e5%b0%86%e6%a8%a1%e5%bc%8f%e5%90%88%e5%b9%b6%e5%9c%a8graphql-mesh%e4%b8%ad%e6%97%b6%ef%bc%8c%e9%81%87%e5%88%b0%e4%ba%86%e5%be%88%e5%a4%a7%e7%9a%84%e5%9b%b0","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%bd%93%e6%88%91%e5%b0%9d%e8%af%95%e5%b0%86%e6%a8%a1%e5%bc%8f%e5%90%88%e5%b9%b6%e5%9c%a8graphql-mesh%e4%b8%ad%e6%97%b6%ef%bc%8c%e9%81%87%e5%88%b0%e4%ba%86%e5%be%88%e5%a4%a7%e7%9a%84%e5%9b%b0\/","title":{"rendered":"\u5f53\u6211\u5c1d\u8bd5\u5c06\u6a21\u5f0f\u5408\u5e76\u5728GraphQL Mesh\u4e2d\u65f6\uff0c\u9047\u5230\u4e86\u5f88\u5927\u7684\u56f0\u96be"},"content":{"rendered":"

GraphQL Mesh\u662f\u4ec0\u4e48\uff1f<\/h1>\n

 <\/p>\n

\u53ef\u4ee5\u5c06\u591a\u4e2aWebAPI\u96c6\u6210\u4e3a\u4e00\u4e2aGraphQL\u670d\u52a1\u7684\u5e93\u3002
\nWebAPI\u53ef\u4ee5\u4f7f\u7528GraphQL\uff0c\u5f53\u7136\u4e5f\u53ef\u4ee5\u4f7f\u7528REST\u7b49\u5404\u79cd\u65b9\u5f0f\u3002<\/p>\n

\u4f8b\u5982<\/h2>\n

\u203b\u867d\u7136\u6211\u60f3\u8868\u8fbe\u4e00\u79cd\u4e2d\u7ee7\u7684\u611f\u89c9\uff0c\u4f46\u4e3a\u4e86\u65b9\u4fbf\u7701\u4e8b\uff0c\u6211\u5c31\u7701\u7565\u4e86\u5168\u90e8\u3002<\/p>\n

\u63d0\u4f9b\u5177\u6709\u4ee5\u4e0b\u6a21\u5f0f\u7684StudentAPI<\/p>\n

type<\/span> Student<\/span> {<\/span>\r\n  id<\/span>:<\/span> ID<\/span>!<\/span>\r\n  name<\/span>:<\/span> String<\/span>!<\/span>\r\n  schoolId<\/span>:<\/span> ID<\/span>!<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> StudentConnection<\/span> {<\/span>\r\n  edges<\/span>:<\/span> [<\/span>StudentNode<\/span>!]<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> StudentNode<\/span> {<\/span>\r\n  node<\/span>:<\/span> Student<\/span>!<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> Query<\/span> {<\/span>\r\n  student<\/span>(<\/span>id<\/span>:<\/span> ID<\/span>!):<\/span> Student<\/span>\r\n  studentsById<\/span>(<\/span>\r\n    ids<\/span>:<\/span> [<\/span>ID<\/span>!]!<\/span>\r\n    after<\/span>:<\/span> ID<\/span>\r\n    first<\/span>:<\/span> Int<\/span>\r\n  ):<\/span> StudentConnection<\/span>!<\/span> \r\n  students<\/span>(<\/span>\r\n    schoolId<\/span>:<\/span> ID<\/span>\r\n    # \u306a\u3093\u304b\u30d5\u30a3\u30fc\u30eb\u30c9\u5897\u3048\u308b\u3067\u3057\u3087\u2026<\/span>\r\n    after<\/span>:<\/span> ID<\/span>,<\/span>\r\n    first<\/span>:<\/span> Int<\/span>\r\n  ):<\/span> StudentConnection<\/span>!<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u5047\u8bbeSchoolAPI\u63d0\u4f9b\u4ee5\u4e0b\u65b9\u6848\uff0c\u5e76\u5206\u522b\u5728\u4e0d\u540c\u7684\u670d\u52a1\u5668\u4e0a\u8fd0\u884c\u3002<\/p>\n
type<\/span> School<\/span> {<\/span>\r\n  id<\/span>:<\/span> ID<\/span>!<\/span>\r\n  name<\/span>:<\/span> String<\/span>!<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> SchoolConnection<\/span> {<\/span>\r\n  edges<\/span>:<\/span> [<\/span>SchoolNode<\/span>!]<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> SchoolNode<\/span> {<\/span>\r\n  node<\/span>:<\/span> School<\/span>!<\/span>\r\n}<\/span>\r\n\r\ntype<\/span> Query<\/span> {<\/span>\r\n  school<\/span>(<\/span>id<\/span>:<\/span> ID<\/span>!):<\/span> School<\/span>\r\n  schoolsById<\/span>(<\/span>\r\n    ids<\/span>:<\/span> [<\/span>ID<\/span>!]!<\/span>\r\n    after<\/span>:<\/span> ID<\/span>\r\n    first<\/span>:<\/span> Int<\/span>\r\n  ):<\/span> SchoolConnection<\/span>!<\/span> \r\n}<\/span>\r\n<\/code><\/pre>\n
Mesh\u7684\u5b89\u88c5\u548c\u914d\u7f6e<\/h2>\n
\u7531\u4e8eMesh\u662f\u4f7f\u7528JS\u5236\u4f5c\u7684\uff0c\u6240\u4ee5\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e00\u4e2a\u968f\u610f\u7684\u5305\u7ba1\u7406\u5668\u8fdb\u884c\u5b89\u88c5\u3002
\n\u6211\u5efa\u8bae\u4f7f\u7528yarn\u6765\u8fdb\u884c\u5b89\u88c5\u3002<\/p>\n
yarn init\r\nyarn add graphql @graphql-mesh\/cli\r\n<\/code><\/pre>\n
\u63a5\u4e0b\u6765\uff0c\u5728\u9879\u76ee\u6839\u76ee\u5f55\u4e2d\u5199\u4e00\u4e2a\u540d\u4e3a .meshrc.yaml \u7684\u914d\u7f6e\u6587\u4ef6\u3002<\/p>\n
sources<\/span>:<\/span>\r\n-<\/span> name<\/span>:<\/span> Student<\/span>\r\n  handler<\/span>:<\/span>\r\n    graphql<\/span>:<\/span>\r\n      endpoint<\/span>:<\/span> <student API\u306e\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8><\/span>\r\n-<\/span> name<\/span>:<\/span> School<\/span>\r\n  handler<\/span>:<\/span>\r\n    graphql<\/span>:<\/span>\r\n      endpoint<\/span>:<\/span> <school API\u306e\u30a8\u30f3\u30c9\u30dd\u30a4\u30f3\u30c8><\/span>\r\n<\/code><\/pre>\n
\u8fd9\u4e2a\u9636\u6bb5\u7684\u9879\u76ee\u7ed3\u6784\u3002<\/p>\n
- project\/\r\n  - node_modules\/\r\n  - .meshrc.yaml\r\n  - package.json\r\n  - yarn.lock\r\n<\/code><\/pre>\n
\u5728\u8fd9\u79cd\u72b6\u6001\u4e0b<\/p>\n
yarn mesh dev\r\n<\/code><\/pre>\n
\u5728\u70b9\u51fb\u5b83\u65f6\uff0c\u670d\u52a1\u5668\u548cGraphiQL\u90fd\u4f1a\u542f\u52a8\u3002\u5728GraphiQL\u4e2d\uff0c\u53ef\u4ee5\u540c\u65f6\u6267\u884c\u5b66\u751f API \u548c\u5b66\u6821 API \u7684\u67e5\u8be2\uff01\u592a\u5389\u5bb3\u4e86\uff01<\/p>\n
\u987a\u4fbf\u63d0\u4e00\u4e0b<\/h3>\n
\u203b\u5728\u6b63\u5f0f\u573a\u5408\u4e0b\u8fd0\u884c\u65f6\uff0c\u5e94\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
yarn mesh build # .mesh\/ \u4e0b\u306b\u6210\u679c\u7269\u304c\u3067\u304d\u308b<\/span>\r\nyarn mesh start # .mesh\/ \u4e0b\u3092\u4f7f\u3063\u3066\u30d7\u30ed\u30c0\u30af\u30b7\u30e7\u30f3\u30e2\u30fc\u30c9\u3067\u8d77\u52d5<\/span>\r\n<\/code><\/pre>\n
\u54ce\u5440\uff0c\u4e5f\u4e0d\u662f\u7279\u522b\u4e86\u4e0d\u8d77\u561b\uff1f<\/p>\n
\u4e0d\u540c\u6765\u6e90\u4e4b\u95f4\u7684\u5173\u7cfb\u5b9a\u4e49<\/h1>\n
\u53ea\u8981\u80fd\u591f\u8c03\u7528\u4e24\u4e2aAPI\uff0c\u5c31\u53ea\u9700\u8981\u8c03\u7528\u539f\u59cb\u670d\u52a1\u5373\u53ef\u3002<\/p>\n
\u7136\u800c\uff0c\u5728 Mesh \u4e2d\uff0c\u60a8\u53ef\u4ee5\u8fdb\u884c\u6a21\u5f0f\u6269\u5c55\u5e76\u8fde\u63a5\u6a21\u5f0f\uff01<\/p>\n
\u505a\u6cd5 (y\u00e0 f\u01ce)<\/h2>\n
\u6211\u60f3\u6682\u65f6\u7ed9\u5b66\u751f\u5206\u914d\u6240\u5c5e\u5b66\u6821\uff0c\u5e76\u7ed9\u5b66\u6821\u5206\u914d\u5b66\u751f\u540d\u5355\u3002<\/p>\n
\u6211\u4f1a\u51c6\u5907\u4ee5\u4e0b\u7684GraphQL\u6587\u4ef6\u3002
\n\u56e0\u4e3a\u5b83\u662f\u5bf9\u73b0\u6709\u7c7b\u578b\u7684\u6269\u5c55\uff0c\u6240\u4ee5\u6211\u4eec\u5c06\u4f7f\u7528extend\u8fdb\u884c\u5b9a\u4e49\u3002<\/p>\n
extend<\/span> type<\/span> Student<\/span> {<\/span>\r\n  school<\/span>:<\/span> School<\/span>\r\n}<\/span>\r\n\r\nextend<\/span> type<\/span> School<\/span> {<\/span>\r\n  students<\/span>(<\/span>\r\n    after<\/span>:<\/span> ID<\/span>\r\n    first<\/span>:<\/span> Int<\/span>\r\n  ):<\/span> StudentConnection<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6211\u5148\u8bd5\u7740\u5199\u4e00\u4e2a\u968f\u610f\u7684\u89e3\u6790\u5668\u6765\u8bfb\u53d6\u8fd9\u4e2a\u3002<\/p>\n
import<\/span> {<\/span> Resolvers<\/span> }<\/span> from<\/span> \"<\/span>.\/.mesh<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> resolvers<\/span>:<\/span> Resolvers<\/span> =<\/span> {<\/span>\r\n  Student<\/span>:<\/span> {<\/span>\r\n    school<\/span>:<\/span> (<\/span>root<\/span>,<\/span> _args<\/span>,<\/span> context<\/span>,<\/span> info<\/span>)<\/span> =><\/span> context<\/span>.<\/span>School<\/span>.<\/span>Query<\/span>.<\/span>school<\/span>(<\/span>\r\n      {<\/span>\r\n        args<\/span>:<\/span> {<\/span> id<\/span>:<\/span> root<\/span>.<\/span>schoolId<\/span> }.<\/span>\r\n        context<\/span>,<\/span>\r\n        info<\/span>,<\/span>\r\n      },<\/span>\r\n    ),<\/span>\r\n  },<\/span>\r\n  School<\/span>:<\/span> {<\/span>\r\n    students<\/span>:<\/span> (<\/span>root<\/span>,<\/span> args<\/span>,<\/span> context<\/span>,<\/span> info<\/span>)<\/span> =><\/span> context<\/span>.<\/span>Student<\/span>.<\/span>studentsByIds<\/span>(<\/span>\r\n      {<\/span>\r\n        args<\/span>:<\/span> {<\/span> schoolId<\/span>:<\/span> root<\/span>.<\/span>id<\/span>,<\/span> after<\/span>:<\/span> args<\/span>.<\/span>after<\/span>,<\/span> first<\/span>:<\/span> args<\/span>.<\/span>first<\/span> },<\/span>\r\n        context<\/span>,<\/span>\r\n        info<\/span>,<\/span>\r\n      },<\/span>\r\n  },<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
Mesh\u7684\u7279\u70b9\u662f\uff0c\u6dfb\u52a0\u5230sources\u7684API\u8bbf\u95ee\u5668\u4f1a\u5728\u4e0a\u4e0b\u6587\u4e2d\u751f\u957f\u3002
\ncontext.<source\u540d\u79f0>.(Query|Mutation|Subscription).<\u6267\u884c\u7684\u67e5\u8be2\u6216\u64cd\u4f5c>\u53ea\u9700\u4f20\u9012\u53c2\u6570\u3001\u4e0a\u4e0b\u6587\u548c\u4fe1\u606f\uff0c\u5b83\u4fbf\u4f1a\u5e2e\u4f60\u8c03\u7528\u539f\u6765\u7684API\u3002<\/p>\n
\u968f\u610f\u653e\u7f6e\u4e24\u4e2a\u6587\u4ef6\u3002<\/p>\n
- project\/\r\n  - node_modules\/\r\n  - .meshrc.yaml\r\n  - package.json\r\n  - resolvers.ts\r\n  - student-and-school.graphql\r\n  - yarn.lock\r\n<\/code><\/pre>\n
\u518d\u52a0\u4e0a\u5b9a\u4e49\u548c\u89e3\u6790\u5668\uff0c\u4ee5\u4f7f\u5b83\u4eec\u8bfb\u53d6\u5230Mesh\u4e2d\uff0c\u9700\u8981\u8fdb\u884c\u914d\u7f6e\u7684\u8ffd\u52a0\u3002<\/p>\n
sources<\/span>:<\/span>\r\n -<\/span> name<\/span>:<\/span> Student<\/span>\r\n     ...<\/span>\r\n -<\/span> name<\/span>:<\/span> School<\/span>\r\n -<\/span>   ...<\/span>\r\n+additionalTypeDefs<\/span>:<\/span>\r\n<\/span>+- .\/student-and-school.graphql<\/span>\r\n<\/span>+additionalResolvers<\/span>:<\/span>\r\n<\/span>+- .\/resolvers.ts<\/span>\r\n<\/span><\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u72b6\u6001\u4e0b\uff0c\u6267\u884c`yarn mesh dev`\u547d\u4ee4\uff0c\u4f1a\u4e3aStudent\u548cSchool\u6dfb\u52a0\u989d\u5916\u7684\u89e3\u6790\u5668\u3002<\/p>\n
\u53ea\u9700\u6267\u884c\u8fd9\u4e2a\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n
query<\/span> {<\/span>\r\n  student<\/span>(<\/span>id<\/span>:<\/span> \"hoge\"<\/span>)<\/span> {<\/span>\r\n    school<\/span> {<\/span>\r\n      name<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4e0d\u52a8\uff01\u4e3a\u4ec0\u4e48\u5462\u3002<\/p>\n
\u53ea\u5199\u89e3\u6790\u5668\u662f\u65e0\u6cd5\u6b63\u5e38\u8fd0\u884c\u7684\u5417\uff1f<\/h2>\n
\u55ef\uff0c\u9996\u5148\u8bf7\u770b\u4e00\u4e0b\u8fd9\u4e2a\u67e5\u8be2\u3002
\n\u771f\u4e0d\u6562\u76f8\u4fe1\u5b83\u771f\u7684\u53ef\u4ee5\u8fd0\u884c\u3002<\/p>\n
query<\/span> {<\/span>\r\n  student<\/span>(<\/span>id<\/span>:<\/span> \"hoge\"<\/span>)<\/span> {<\/span>\r\n    schoolId<\/span>\r\n    school<\/span> {<\/span>\r\n      name<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4f60\u662f\u5426\u80fd\u7406\u89e3\u5462\uff1f
\n\u5728Student.school\u7684\u89e3\u6790\u5668\u4e2d\uff0c\u4f7f\u7528root.schoolId\u3002
\n\u4f46\u662f\uff0c\u7531\u4e8e\u6700\u521d\u7684\u67e5\u8be2\u6ca1\u6709\u83b7\u53d6schoolId\uff0c\u6240\u4ee5root.schoolId\u53d8\u4e3a\u672a\u5b9a\u4e49\u3002
\n\u771f\u662f\u7cdf\u7cd5\u554a\u3002\u83b7\u53d6\u5b66\u6821\u65f6\u6bcf\u6b21\u90fd\u5fc5\u987b\u83b7\u53d6schoolId\u5417\uff1f<\/p>\n
\u90a3\u79cd\u4e8b\u60c5\u5e76\u6ca1\u6709\u53d1\u751f\u3002<\/p>\n
resolver\u7684\u91cd\u65b0\u5b9a\u4e49<\/h2>\n
\u76ee\u524d\u770b\u6765\uff0c\u5982\u679c\u52a0\u4e0a\u6b63\u786e\u7b54\u6848\uff0c\u5c31\u4f1a\u53d8\u6210\u8fd9\u6837\u3002<\/p>\n
import<\/span> {<\/span> Resolvers<\/span> }<\/span> from<\/span> \"<\/span>.\/.mesh<\/span>\"<\/span>;<\/span>\r\n\r\nconst<\/span> resolvers<\/span>:<\/span> Resolvers<\/span> =<\/span> {<\/span>\r\n  Student<\/span>:<\/span> {<\/span>\r\n    school<\/span>:<\/span> {<\/span>\r\n      selectionSet<\/span>:<\/span> \"<\/span>{ schoolId }<\/span>\"<\/span>,<\/span>\r\n      resolver<\/span>:<\/span> (<\/span>root<\/span>,<\/span> _args<\/span>,<\/span> context<\/span>,<\/span> info<\/span>)<\/span> =><\/span> context<\/span>.<\/span>School<\/span>.<\/span>Query<\/span>.<\/span>school<\/span>(<\/span>\r\n        {<\/span>\r\n          args<\/span>:<\/span> {<\/span> id<\/span>:<\/span> root<\/span>.<\/span>schoolId<\/span> },<\/span>\r\n          context<\/span>,<\/span>\r\n          info<\/span>,<\/span>\r\n        },<\/span>\r\n      ),<\/span>\r\n    },<\/span>\r\n  },<\/span>\r\n  School<\/span>:<\/span> {<\/span>\r\n    students<\/span>:<\/span> {<\/span>\r\n      selectionSet<\/span>:<\/span> \"<\/span>{ id }<\/span>\"<\/span>,<\/span>\r\n      resolver<\/span>:<\/span> (<\/span>root<\/span>,<\/span> args<\/span>,<\/span> context<\/span>,<\/span> info<\/span>)<\/span> =><\/span> context<\/span>.<\/span>Student<\/span>.<\/span>studentsByIds<\/span>(<\/span>\r\n        {<\/span>\r\n          args<\/span>:<\/span> {<\/span> schoolId<\/span>:<\/span> root<\/span>.<\/span>id<\/span>,<\/span> after<\/span>:<\/span> args<\/span>.<\/span>after<\/span>,<\/span> first<\/span>:<\/span> args<\/span>.<\/span>first<\/span> },<\/span>\r\n          context<\/span>,<\/span>\r\n          info<\/span>,<\/span>\r\n        },<\/span>\r\n      },<\/span>\r\n    ],<\/span>\r\n  },<\/span>\r\n};<\/span>\r\n<\/code><\/pre>\n
\u6211\u8ba4\u4e3a\u4f60\u53ef\u4ee5\u770b\u5230 resolve \u51fd\u6570\u88ab\u79fb\u52a8\u5230 resolver \u5b57\u6bb5\u4e2d\uff0c\u5e76\u4e14\u65b0\u589e\u4e86\u4e00\u4e2a\u53eb\u505a selectionSet \u7684\u5c5e\u6027\u3002
\nselectionSet \u662f\u7528\u6765\u7f16\u5199\u67e5\u8be2\u6839\u5c5e\u6027\u4ee5\u89e3\u6790\u6307\u5b9a\u5b57\u6bb5\u6240\u9700\u7684\u9009\u62e9\u5668\u7684\u3002\u8bf7\u6ce8\u610f\uff0c\u5982\u679c\u4e0d\u4f7f\u7528”{}”\u62ec\u8d77\u6765\uff0c\u5c06\u4f1a\u5bfc\u81f4\u89e3\u6790\u9519\u8bef\u3002<\/p>\n
\u56e0\u4e3a\u6709\u7c7b\u578b\u63d0\u793a\uff0c\u6240\u4ee5\u6211\u80fd\u591f\u901a\u8fc7\u5c1d\u8bd5\u548c\u9519\u8bef\u627e\u5230\u7b54\u6848\uff0c\u4f46\u662f\u7406\u89e3\u8fd9\u4e2a\u5c5e\u6027\u7684\u542b\u4e49\u82b1\u4e86\u76f8\u5f53\u957f\u7684\u65f6\u95f4\u3002
\n\u5728\u6587\u6863\u4e2d\uff0c\u53ea\u662f\u7b80\u5355\u5730\u5728\u4ee3\u7801\u4e2d\u5199\u4e86selectionSet\uff0c\u6ca1\u6709\u5199\u660e\u5b83\u7684\u542b\u4e49\u3002\u771f\u8be5\u6b7b\uff01<\/p>\n
\u8fd8\u53ef\u4ee5\u7ee7\u7eed\u5417\uff1f\u89e3\u51b3N+1\u95ee\u9898\uff01<\/h1>\n
\u4f60\u4e5f\u8bb8\u6ce8\u610f\u5230\u4e86\u8fd9\u6bb5\u4ee3\u7801\u5b58\u5728n+1\u95ee\u9898\uff0c\u5982\u679c\u4f60\u7ec6\u5fc3\u5730\u9605\u8bfb\u4e86\u524d\u9762\u7684\u6587\u7ae0\u3002
\nStudent.school\u3002\u5c31\u662f\u4f60\u3002<\/p>\n
  \/* \u524d\u7565 *\/<\/span>\r\n  Student<\/span>:<\/span> {<\/span>\r\n    school<\/span>:<\/span> {<\/span>\r\n      selectionSet<\/span>:<\/span> \"<\/span>{ schoolId }<\/span>\"<\/span>,<\/span>\r\n      resolver<\/span>:<\/span> (<\/span>root<\/span>,<\/span> _args<\/span>,<\/span> context<\/span>,<\/span> info<\/span>)<\/span> =><\/span> context<\/span>.<\/span>School<\/span>.<\/span>Query<\/span>.<\/span>school<\/span>(<\/span>\r\n        {<\/span>\r\n          args<\/span>:<\/span> {<\/span> id<\/span>:<\/span> root<\/span>.<\/span>schoolId<\/span> },<\/span>\r\n          context<\/span>,<\/span>\r\n          info<\/span>,<\/span>\r\n        },<\/span>\r\n      ),<\/span>\r\n    },<\/span>\r\n  },<\/span>\r\n  \/* \u5f8c\u7565 *\/<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u6bb5\u4ee3\u7801\u6b63\u5728\u8c03\u7528SchoolAPI\u7684school\u3002
\n\u6bcf\u5f53Student\u88abresolve\u65f6\uff0cschool\u5c31\u4f1a\u88ab\u8c03\u7528\u4e00\u6b21\uff01
\n\u4f8b\u5982\uff0c\u5982\u679c\u7f16\u5199\u4ee5\u4e0b\u67e5\u8be2\uff0c\u5c31\u4f1a\u8c03\u7528school\u6700\u591a100\u6b21\uff0c\u5373\u6bcf\u6b21\u8fd4\u56de\u4e00\u4e2aStudent\u3002<\/p>\n
query<\/span> {<\/span>\r\n  students<\/span>(<\/span>after<\/span>:<\/span> \"???\"<\/span>,<\/span> first<\/span>:<\/span> 100<\/span>)<\/span> {<\/span>\r\n    edges<\/span> {<\/span>\r\n      node<\/span> {<\/span>\r\n        name<\/span>\r\n        school<\/span> {<\/span>\r\n          name<\/span>\r\n        }<\/span>\r\n      }<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u662f\u4e0e\u6570\u636e\u5e93\u4ea4\u4e92\u7684\u60c5\u51b5\uff0c\u6211\u4f1a\u4f7f\u7528dataloader\u4e4b\u7c7b\u7684\u5de5\u5177\u8fdb\u884c\u6574\u7406\u3002
\n\u4f46\u662f\u56e0\u4e3a\u5bf9\u65b9\u662fAPI\uff0c\u6240\u4ee5\u6709\u4e9b\u56f0\u96be\u3002
\n\u54e6\uff0cdataloader\u771f\u662f\u592a\u68d2\u4e86\uff0c\u6211\u4eec\u5e94\u8be5\u4f7f\u7528\u5b83\u3002<\/p>\n
 <\/p>\n
\u7136\u800c\uff0cMesh\u5185\u7f6e\u4e86\u6279\u5904\u7406\u529f\u80fd\u3002<\/p>\n
\u4e3a\u4e86\u89e3\u51b3\u95ee\u9898\uff0c\u8ba9\u4f60\u5c1d\u8bd5\u4e00\u70b9\u70b9\u5730\u72f1\u3002<\/h2>\n
\u9996\u5148\uff0c\u8fd9\u6837\u5427\u3002<\/p>\n
  Student<\/span>:<\/span> {<\/span>\r\n    school<\/span>:<\/span> {<\/span>\r\n      selectionSet<\/span>:<\/span> \"<\/span>{ schoolId }<\/span>\"<\/span>,<\/span>\r\n- <\/span>     resolver<\/span>:<\/span> (<\/span>root<\/span>,<\/span> _args<\/span>,<\/span> context<\/span>,<\/span> info<\/span>)<\/span> =><\/span> context<\/span>.<\/span>School<\/span>.<\/span>Query<\/span>.<\/span>school<\/span>(<\/span>\r\n<\/span>+ <\/span>     resolver<\/span>:<\/span> (<\/span>root<\/span>,<\/span> _args<\/span>,<\/span> context<\/span>,<\/span> info<\/span>)<\/span> =><\/span> context<\/span>.<\/span>School<\/span>.<\/span>Query<\/span>.<\/span>schools<\/span>(<\/span>\r\n<\/span>        {<\/span>\r\n- <\/span>        args<\/span>:<\/span> {<\/span> id<\/span>:<\/span> root<\/span>.<\/span>schoolId<\/span> },<\/span>\r\n<\/span>+ <\/span>        key<\/span>:<\/span> root<\/span>.<\/span>schoolId<\/span>,<\/span>\r\n<\/span>+ <\/span>        argsFromKeys<\/span>:<\/span> (<\/span>keys<\/span>:<\/span> string<\/span>[])<\/span> =><\/span> ({<\/span>\r\n<\/span>+ <\/span>          ids<\/span>:<\/span> keys<\/span>,<\/span>\r\n<\/span>+ <\/span>        }),<\/span>\r\n<\/span>+ <\/span>        valueFromResults<\/span>:<\/span> (<\/span>results<\/span>,<\/span> keys<\/span>:<\/span> string<\/span>[])<\/span> =><\/span>\r\n<\/span>+ <\/span>          keys<\/span>.<\/span>map<\/span>(<\/span>key<\/span> =><\/span> results<\/span>.<\/span>edges<\/span>\r\n<\/span>+ <\/span>            .<\/span>map<\/span>(<\/span>e<\/span> =><\/span> e<\/span>.<\/span>node<\/span>)<\/span>\r\n<\/span>+ <\/span>            .<\/span>find<\/span>(<\/span>n<\/span> =><\/span> n<\/span>.<\/span>id<\/span> ===<\/span> key<\/span>)<\/span> ??<\/span> null<\/span>\r\n<\/span>+ <\/span>          ),<\/span>\r\n<\/span>          context<\/span>,<\/span>\r\n          info<\/span>,<\/span>\r\n        },<\/span>\r\n      ),<\/span>\r\n    },<\/span>\r\n  },<\/span>\r\n<\/code><\/pre>\n
\u5c06API\u66f4\u6539\u4e3aschools\uff0c\u5e76\u6dfb\u52a0\u6279\u5904\u7406\u8bbe\u7f6e\u3002<\/p>\n
key: argsFromKeys \u306b\u308f\u305f\u308b\u30ad\u30fc\u5024<\/p>\n
argsFromKeys: \u8907\u6570\u306e\u30ad\u30fc\u5024\u304b\u3089\u3001\u53e9\u304fAPI\u306eargs\u3092\u4f5c\u308b\u95a2\u6570\u3002\u95a2\u6570\u306a\u306e\u3067\u3001\u30ad\u30fc\u5024\u4ee5\u5916\u306e\u5f15\u6570\u3082\u8fd4\u308a\u5024\u306b\u52a0\u3048\u308c\u3070\u5f15\u6570\u3068\u3057\u3066\u6210\u7acb\u3057\u307e\u3059\u3002<\/p>\n
valueFromResults: API\u306e\u8fd4\u308a\u5024\u304b\u3089\u3001\u30ad\u30fc\u306e\u9806\u756a\u306b\u53d6\u5f97\u7d50\u679c\u3092\u53d6\u308a\u51fa\u3057\u307e\u3059\u3002<\/p>\n
undefined\u3092\u8fd4\u3059\u3068\u578b\u30c1\u30a7\u30c3\u30af\u306b\u3072\u3063\u304b\u304b\u308b\u306e\u3067\u6ce8\u610f(\u4efb\u610f\u30d1\u30e9\u30e1\u30fc\u30bf\u304c | null \u3067\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b\u305f\u3081)<\/p>\n
\u53ea\u662f\uff0c\u53ea\u6709\u8fd9\u6837\u7684\u8bdd\u4e0d\u80fd\u52a8\u3002
\n\u5e0c\u671b\u80fd\u591f\u56de\u5fc6\u8d77\u5148\u524d\u7684\u67e5\u8be2\u3002<\/p>\n
query<\/span> {<\/span>\r\n  students<\/span>(<\/span>after<\/span>:<\/span> \"???\"<\/span>,<\/span> first<\/span>:<\/span> 100<\/span>)<\/span> {<\/span>\r\n    edges<\/span> {<\/span>\r\n      node<\/span> {<\/span>\r\n        name<\/span>\r\n        school<\/span> {<\/span>\r\n          name<\/span>\r\n        }<\/span>\r\n      }<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n<\/code><\/pre>\n
\u5728\u5b66\u6821\u4e2d\uff0c\u6240\u5199\u7684\u9009\u62e9\u5668\u662f{ name }\u3002
\n\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c\u4f1a\u5c06\u5176\u76f4\u63a5\u8fde\u63a5\u5230schools\u9009\u62e9\u5668\u4e0a\u3002
\n\u4f46\u662f\uff0c\u7531\u4e8eschools\u662f\u8fd4\u56deConnection\u7684\uff0c\u5b9e\u9645\u4e0a\u6211\u4eec\u5e0c\u671b\u505a\u7684\u662f\u8fd9\u6837\u7684\u3002<\/p>\n
-school<\/span> {<\/span>\r\n<\/span>+<\/span>edges<\/span> {<\/span>\r\n<\/span>+<\/span>  node<\/span> {<\/span>\r\n<\/span>      name<\/span>\r\n+<\/span>  }<\/span>\r\n<\/span>}<\/span>\r\n<\/code><\/pre>\n
\u603b\u4e4b\uff0c\u6211\u4eec\u53ea\u9700\u7528 edges { node { } } \u6765\u5305\u56f4\u539f\u59cb\u9009\u62e9\u5668\uff0c\u662f\u5417\uff1f\u55ef\u55ef\u3002
\n\u90a3\u4e48\uff0c\u4f60\u662f\u600e\u4e48\u505a\u7684\u5462\uff1f<\/p>\n
\u8fd9\u6837\u5427\u3002<\/p>\n
  Student<\/span>:<\/span> {<\/span>\r\n    school<\/span>:<\/span> {<\/span>\r\n      selectionSet<\/span>:<\/span> \"<\/span>{ schoolId }<\/span>\"<\/span>,<\/span>\r\n       resolver<\/span>:<\/span> (<\/span>root<\/span>,<\/span> _args<\/span>,<\/span> context<\/span>,<\/span> info<\/span>)<\/span> =><\/span> context<\/span>.<\/span>School<\/span>.<\/span>Query<\/span>.<\/span>schools<\/span>(<\/span>\r\n        {<\/span>\r\n          key<\/span>:<\/span> root<\/span>.<\/span>schoolId<\/span>,<\/span>\r\n          argsFromKeys<\/span>:<\/span> (<\/span>keys<\/span>:<\/span> string<\/span>[])<\/span> =><\/span> ({<\/span>\r\n            ids<\/span>:<\/span> keys<\/span>,<\/span>\r\n          }),<\/span>\r\n          valueFromResults<\/span>:<\/span> (<\/span>results<\/span>,<\/span> keys<\/span>:<\/span> string<\/span>[])<\/span> =><\/span>\r\n            keys<\/span>.<\/span>map<\/span>(<\/span>key<\/span> =><\/span> results<\/span>.<\/span>edges<\/span>\r\n              .<\/span>map<\/span>(<\/span>e<\/span> =><\/span> e<\/span>.<\/span>node<\/span>)<\/span>\r\n              .<\/span>find<\/span>(<\/span>n<\/span> =><\/span> n<\/span>.<\/span>id<\/span> ===<\/span> key<\/span>)<\/span> ??<\/span> null<\/span>\r\n            ),<\/span>\r\n          context<\/span>,<\/span>\r\n          info<\/span>,<\/span>\r\n+ <\/span>        selectionSet<\/span>:<\/span> [<\/span>\r\n<\/span>+ <\/span>          {<\/span>\r\n<\/span>+ <\/span>            kind<\/span>:<\/span> Kind<\/span>.<\/span>FIELD<\/span>,<\/span>\r\n<\/span>+ <\/span>            name<\/span>:<\/span> {<\/span> kind<\/span>:<\/span> Kind<\/span>.<\/span>NAME<\/span>,<\/span> value<\/span>:<\/span> \"<\/span>edges<\/span>\"<\/span> },<\/span>\r\n<\/span>+ <\/span>            selectionSet<\/span>:<\/span> {<\/span>\r\n<\/span>+ <\/span>              kind<\/span>:<\/span> Kind<\/span>.<\/span>SELECTION_SET<\/span>,<\/span>\r\n<\/span>+ <\/span>              selections<\/span>:<\/span> info<\/span>.<\/span>fieldNodes<\/span>.<\/span>map<\/span>(<\/span>f<\/span> =><\/span> ({<\/span>\r\n<\/span>+ <\/span>                ...<\/span>f<\/span>,<\/span>\r\n<\/span>+ <\/span>                name<\/span>:<\/span> {<\/span> kind<\/span>:<\/span> Kind<\/span>.<\/span>NAME<\/span>,<\/span> value<\/span>:<\/span> \"<\/span>node<\/span>\"<\/span> },<\/span>\r\n<\/span>+ <\/span>                selectionSet<\/span>:<\/span> mergeSelectionSetNodes<\/span>(<\/span>\r\n<\/span>+ <\/span>                  f<\/span>.<\/span>selectionSet<\/span>,<\/span>\r\n<\/span>+ <\/span>                  parseSelectionSetNode<\/span>(<\/span>\r\n<\/span>+ <\/span>                    gql<\/span>`<\/span>\r\n<\/span>+                       {<\/span>\r\n<\/span>+                         id<\/span>\r\n<\/span>+                       }<\/span>\r\n<\/span>+                     `<\/span>\r\n<\/span>+ <\/span>                  )<\/span>\r\n<\/span>+ <\/span>                )<\/span>\r\n<\/span>+ <\/span>              }),<\/span>\r\n<\/span>+ <\/span>            },<\/span>\r\n<\/span>+ <\/span>          },<\/span>\r\n<\/span>+ <\/span>        ],<\/span>\r\n<\/span>        },<\/span>\r\n      ),<\/span>\r\n    },<\/span>\r\n  },<\/span>\r\n<\/code><\/pre>\n
\u662f\u7684\uff0c\u6211\u5df2\u7ecf\u5230\u4e86\u5bf9\u4e8egraphql.js\u4e2dDocumentNode\u5982\u4f55\u6784\u5efa\u7684\u4e0d\u592a\u6e05\u695a\u7684\u9886\u57df\u3002
\n\u91cd\u70b9\u6709\u56db\u4e2a\u3002<\/p>\n
    \n
  1. \n
      \u901a\u8fc7selectionSet\u5c5e\u6027\u8986\u76d6\u9009\u62e9\u5668<\/ol>\n<\/li>\n<\/ol>\n
       <\/p>\n
        \n
      1. \n
          \u5982\u679c\u4f60\u5bf9SelectionSetNode\u7c7b\u578b\u611f\u5174\u8da3\u7684\u8bdd\uff0c\u53ef\u4ee5\u53bb\u770b\u4e00\u4e0b<\/ol>\n<\/li>\n<\/ol>\n
           <\/p>\n
            \n
          1. \n
              \u5bf9\u4e8e\u539f\u59cb\u7684school\uff0c\u53ef\u4ee5\u901a\u8fc7info.fieldNodes\u83b7\u53d6\u9009\u62e9\u5668<\/ol>\n<\/li>\n<\/ol>\n
               <\/p>\n
                \n
              1. \n
                  \u7136\u800c\uff0c\u8fd9\u53ea\u662f\u9488\u5bf9school\u7684\u9009\u62e9\u5668\uff0c\u6211\u4eec\u9700\u8981\u5c06\u5176\u66f4\u6539\u4e3a\u9488\u5bf9node\u7684\u9009\u62e9\u5668\u3002<\/ol>\n<\/li>\n<\/ol>\n
                   <\/p>\n
                    \n
                  1. \n
                      \u5173\u4e8e\u8fd9\u4e2a\u9009\u62e9\u5668\u662f\u9488\u5bf9\u54ea\u4e2a\u5b57\u6bb5\u7684\uff0c\u53ef\u4ee5\u901a\u8fc7name\u5c5e\u6027\u83b7\u53d6\u5e76\u8fdb\u884c\u66f4\u6539\u3002<\/ol>\n<\/li>\n<\/ol>\n
                       <\/p>\n
                        \n
                      1. \n
                          \u57fa\u672c\u4e0a\uff0cDocumentNode\u662f\u53ea\u8bfb\u7684\uff0c\u4e0d\u80fd\u76f4\u63a5\u4fee\u6539\u5176\u503c\u3002<\/ol>\n<\/li>\n<\/ol>\n
                           <\/p>\n
                            \n
                          1. \n
                              \u6240\u4ee5\u6211\u4eec\u9700\u8981\u4f7f\u7528\u6269\u5c55\u8fd0\u7b97\u7b26\u4e4b\u7c7b\u7684\u65b9\u6cd5\u6765\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5bf9\u8c61\u3002<\/ol>\n<\/li>\n<\/ol>\n
                              \u867d\u7136\u5728valueFromResults\u4e2d\u4f7f\u7528\u4e86id\uff0c\u4f46\u5b83\u4e0d\u4e00\u5b9a\u5305\u542b\u5728\u9009\u62e9\u5668\u4e2d\uff0c\u6240\u4ee5\u9700\u8981\u5c06\u5176\u6dfb\u52a0\u5230\u9009\u62e9\u5668\u4e2d\u3002
                              \n\u627e\u4e0d\u5230\u7c7b\u4f3cmergeSelectionSetNodes\u548cparseSelectionSetNode\u7684\u5e93\uff0c\u6240\u4ee5\u6211\u81ea\u5df1\u521b\u5efa\u4e86\u4e00\u4e2a\u3002
                              \n\u5982\u679c\u6574\u7406\u597d\u4e86\u7684\u8bdd\u53ef\u80fd\u4f1a\u516c\u5f00\u3002
                              \n\u5982\u679c\u5df2\u7ecf\u6709\u7c7b\u4f3c\u7684\u5e93\uff0c\u8bf7\u544a\u8bc9\u6211\uff01<\/p>\n
                              \u6839\u636e\u4ee5\u4e0b\u8fd9\u7bc7\u6587\u7ae0\u7684\u8bf4\u6cd5\uff0c\u7528\u6307\u4ee4\u4f3c\u4e4e\u4e5f\u53ef\u4ee5\u505a\u5230\u540c\u6837\u7684\u4e8b\u60c5\u3002<\/p>\n
                               <\/p>\n
                                \n
                              • \n
                                  \u305f\u3076\u3093 { edge { node {} } \u3067\u56f2\u3080\u306e\u7121\u7406\u3060\u3088\u306a\u3042\u3068\u601d\u3063\u3066\u3044\u308b<\/ul>\n<\/li>\n<\/ul>\n
                                   <\/p>\n
                                    \u5b8c\u5168\u306b\u5b9f\u88c5\u306e\u8a71\u3067\u3042\u308a\u3001\u4ed5\u69d8\u3092\u66f8\u304f\u3079\u304d\u30b9\u30ad\u30fc\u30de\u5b9a\u7fa9\u306b\u66f8\u304f\u306e\u306f\u306a\u3093\u304b\u9055\u548c\u611f\u304c\u3042\u308b<\/ul>\n
                                    \u5728\u8fd9\u65b9\u9762\u6211\u6ca1\u6709\u592a\u6df1\u5165\u63a2\u8ba8\u3002
                                    \n\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u6211\u7ed3\u5408\u4e86\u8fd9\u7bc7\u6587\u7ae0\u548c\u7c7b\u578b\u63d0\u793a\u8fdb\u884c\u63a8\u6d4b\uff0c\u627e\u5230\u4e86\u6b63\u786e\u7b54\u6848\u3002\u6587\u6863\u554a\uff01<\/p>\n
                                    \u603b\u7ed3<\/h1>\n
                                    \u6211\u5c1d\u8bd5\u4f7f\u7528GraphQL Mesh\u6765\u6574\u5408\u591a\u4e2aAPI\u5e76\u5b9e\u73b0API\u4e4b\u95f4\u7684\u5173\u8054\u5173\u7cfb\uff0c\u4f46\u662f\u7f3a\u5c11\u7684\u63d0\u793a\u592a\u5c11\u4e86\uff0c\u8ba9\u6211\u611f\u5230\u975e\u5e38\u56f0\u60d1\u3002<\/p>\n
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