{"id":47912,"date":"2023-09-03T21:37:45","date_gmt":"2023-05-27T01:01:17","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e4%bd%bf%e7%94%a8-graphql-ruby-%e8%bd%bb%e6%9d%be%e5%ae%9e%e7%8e%b0%e4%ba%86%e5%88%86%e9%a1%b5%e5%8a%9f%e8%83%bd%ef%bc%8c%e5%9b%a0%e6%ad%a4%e6%88%91%e6%9f%a5%e7%9c%8b%e4%ba%86-gem-%e5%81%9a\/"},"modified":"2024-04-30T21:26:40","modified_gmt":"2024-04-30T13:26:40","slug":"%e6%88%91%e4%bd%bf%e7%94%a8-graphql-ruby-%e8%bd%bb%e6%9d%be%e5%ae%9e%e7%8e%b0%e4%ba%86%e5%88%86%e9%a1%b5%e5%8a%9f%e8%83%bd%ef%bc%8c%e5%9b%a0%e6%ad%a4%e6%88%91%e6%9f%a5%e7%9c%8b%e4%ba%86-gem-%e5%81%9a","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e4%bd%bf%e7%94%a8-graphql-ruby-%e8%bd%bb%e6%9d%be%e5%ae%9e%e7%8e%b0%e4%ba%86%e5%88%86%e9%a1%b5%e5%8a%9f%e8%83%bd%ef%bc%8c%e5%9b%a0%e6%ad%a4%e6%88%91%e6%9f%a5%e7%9c%8b%e4%ba%86-gem-%e5%81%9a\/","title":{"rendered":"\u6211\u4f7f\u7528 graphql-ruby \u8f7b\u677e\u5b9e\u73b0\u4e86\u5206\u9875\u529f\u80fd\uff0c\u56e0\u6b64\u6211\u67e5\u770b\u4e86 Gem \u505a\u4e86\u4ec0\u4e48"},"content":{"rendered":"

\u5982\u679c\u5728Rails\u5e94\u7528\u4e2d\u4f7f\u7528GraphQL\uff0c\u6709\u4e00\u4e2a\u79f0\u4e3a`graphql-ruby`\u7684\u5f3a\u5927\u7684Gem\u53ef\u4f9b\u4f7f\u7528\u3002
\nhttps:\/\/github.com\/rmosolgo\/graphql-ruby<\/p>\n

GraphQL\u901a\u8fc7\u79f0\u4e3aconnections\u7684\u673a\u5236\u6765\u5b9e\u73b0\u5206\u9875\u529f\u80fd\u3002\u5728connections\u4e2d\uff0c\u60a8\u53ef\u4ee5\u6307\u5b9a\u8981\u83b7\u53d6\u7684\u6570\u91cf\u548c\u5f00\u59cb\u83b7\u53d6\u7684\u4f4d\u7f6e\u3002\u8be6\u60c5\u8bf7\u53c2\u8003\u5b98\u65b9\u7f51\u7ad9\uff1ahttps:\/\/facebook.github.io\/relay\/graphql\/connections.htm\u3002<\/p>\n

\u7528graphql-ruby\u5b9e\u73b0\u4e86\u5206\u9875\u529f\u80fd\u540e\uff0c\u6211\u611f\u5230\u975e\u5e38\u9707\u64bc\uff0c\u51e0\u4e4e\u4e0d\u9700\u8981\u7f16\u5199\u4efb\u4f55\u4ee3\u7801\u5c31\u53ef\u4ee5\u5b8c\u6210\u5b9e\u73b0\u3002\u6240\u4ee5\u6211\u51b3\u5b9a\u67e5\u770bgraphql-ruby\u7684\u6e90\u7801\u4ee5\u4e86\u89e3\u5b83\u7684\u5de5\u4f5c\u539f\u7406\u3002<\/p>\n

\u73af\u5883<\/h1>\n

\u73af\u5883\u53d8\u52a8\u5982\u4e0b\u6240\u5217\u3002<\/p>\n

Ruby: 2.6.5
\nRails: 6.0.0
\ngraphql-ruby: 1.9.12
\nMysql: 5.7.27<\/p>\n

\u7ea2\u5b9d\u77f3\uff1a2.6.5
\nRails\uff1a6.0.0
\ngraphql-ruby\uff1a1.9.12
\nMysql\uff1a5.7.27<\/p>\n

\u5b9e\u65bd<\/h1>\n

\u5728\u5b9e\u73b0Rails\u672c\u8eab\u4ee5\u53caconnection\u7684\u5b9e\u73b0\u65b9\u6cd5\u4e2d\uff0c\u7701\u7565\u4e86\u4e0e\u5176\u76f4\u63a5\u76f8\u5173\u7684\u90e8\u5206\u3002<\/p>\n

\u5b89\u88c5GraphQL-Ruby<\/h2>\n

\u5c06\u5176\u6dfb\u52a0\u5230Gemfile\u5e76\u8fdb\u884c\u5b89\u88c5\u3002\u8be6\u7ec6\u4fe1\u606f\u53ef\u4ee5\u5728Github\u7684README\u7b49\u6587\u6863\u4e2d\u627e\u5230\u3002<\/p>\n

gem<\/span> 'graphql'<\/span>\r\n<\/code><\/pre>\n
bundle<\/span> install<\/span>\r\nrails<\/span> generate<\/span> graphql<\/span>:install<\/span>\r\n<\/code><\/pre>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u521b\u5efa\u8868\u683c<\/h2>\n
\u4f7f\u7528\u5177\u6709\u6807\u9898\uff08title\uff09\u548c\u6b63\u6587\uff08body\uff09\u680f\u7684Review\u8868\u683c\u3002
\n\u751f\u6210\u6a21\u578b\uff08Model\uff09\u548c\u8fc1\u79fb\u6587\u4ef6\uff08Migration\uff09\u4ee5\u521b\u5efa\u8868\u683c\u3002<\/p>\n
rails<\/span> g<\/span> model<\/span> Review<\/span> title<\/span>:string<\/span> body<\/span>:text<\/span>\r\n<\/code><\/pre>\n
\u7531\u4e8e\u60f3\u8981\u89c2\u5bdf\u5206\u9875\u529f\u80fd\uff0c\u6211\u4f1a\u5728\u63a7\u5236\u53f0\u4e0a\u968f\u610f\u521b\u5efa\u4e00\u4e9b\u6570\u636e\u6765\u586b\u5145\u8868\u683c\u3002<\/p>\n
200<\/span>.<\/span>times<\/span> do<\/span> |<\/span>i<\/span>|<\/span>\r\n  Review<\/span>.<\/span>create!<\/span>(<\/span>title: <\/span>\"title<\/span>#{<\/span>i<\/span>}<\/span>\"<\/span>,<\/span> body: <\/span>\"body<\/span>#{<\/span>i<\/span>}<\/span>\"<\/span>)<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
GraphQL\u76f8\u5173\u7684\u5b9e\u73b0<\/h2>\n
\u521b\u5efa\u5bf9\u5e94\u4e8e\u5148\u524d\u521b\u5efa\u7684reviews\u8868\u7684review_type\u3002<\/p>\n
module<\/span> Types<\/span>\r\n  class<\/span> ReviewType<\/span> <<\/span> BaseObject<\/span>\r\n    field<\/span> :id<\/span>,<\/span> ID<\/span>,<\/span> null: <\/span>false<\/span>\r\n    field<\/span> :title<\/span>,<\/span> String<\/span>,<\/span> null: <\/span>true<\/span>\r\n    field<\/span> :body<\/span>,<\/span> String<\/span>,<\/span> null: <\/span>true<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u63a5\u4e0b\u6765\uff0c\u8bf7\u521b\u5efa\u83b7\u53d6reviews\u7684\u67e5\u8be2\u7c7b\u578b\u3002<\/p>\n
module<\/span> Types<\/span>\r\n  class<\/span> QueryType<\/span> <<\/span> Types<\/span>::<\/span>BaseObject<\/span>\r\n    field<\/span> :reviews<\/span>,<\/span> Types<\/span>::<\/span>ReviewType<\/span>.<\/span>connection_type<\/span>,<\/span> null: <\/span>true<\/span> do<\/span>\r\n      description<\/span> 'select reviews'<\/span>\r\n    end<\/span>\r\n    def<\/span> reviews<\/span>\r\n      Review<\/span>.<\/span>all<\/span>.<\/span>order<\/span>(<\/span>id: :desc<\/span>)<\/span>\r\n    end<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u53ea\u9700\u5728\u6307\u5b9a\u5b57\u6bb5\u7c7b\u578b\u7684\u4f4d\u7f6e\u5199\u4e0aReviewType.connection_type\uff0c\u5c31\u53ef\u4ee5\u6307\u5b9a\u4e4b\u524d\u5b9a\u4e49\u7684ReviewType\u8fd4\u56de\u591a\u4e2a\u8fde\u63a5\u7c7b\u578b\u7684connections\u3002
\n\u5728\u6570\u636e\u83b7\u53d6\u4e2d\uff0c\u4f1a\u8c03\u7528\u540d\u5b57\u4e0e\u5b57\u6bb5\u540d\u76f8\u540c\u7684reviews\u65b9\u6cd5\u4e2d\u7684\u5904\u7406\u3002
\n\u7531\u4e8e\u4f1a\u81ea\u52a8\u6dfb\u52a0\u6240\u9700\u7684\u9650\u5236\u7b49\u5206\u9875\u4fe1\u606f\uff0c\u6240\u4ee5\u5728\u8fd9\u91cc\u53ea\u8bb0\u5f55\u57fa\u672c\u7684\u83b7\u53d6\u5904\u7406\u3002
\n\u8fd9\u6b21\u6211\u4eec\u5c06\u83b7\u53d6\u6240\u6709\u8bc4\u5ba1\u5e76\u6309\u7167id\u964d\u5e8f\u6392\u5e8f\u7684\u89c4\u683c\u3002<\/p>\n
\u6709\u7684\u5c31\u662f\u8fd9\u6837\u4e86\u3002\u554a\uff0c\u592a\u7b80\u5355\u4e86\uff01\u90a3\u4e48\u6211\u4eec\u63a5\u4e0b\u6765\u6765\u770b\u770b\u4e0b\u4e00\u7ae0\u7684\u5185\u5bb9\u5427\u3002<\/p>\n
\u786e\u8ba4\u52a8\u4f5c<\/h1>\n
\u6211\u5c06\u4f7f\u7528GraphiQL\u8fdb\u884c\u64cd\u4f5c\u786e\u8ba4\u3002
\n\u9996\u5148\uff0c\u6211\u5c06\u5c1d\u8bd5\u83b7\u53d6\u524d10\u6761\u8bb0\u5f55\u3002<\/p>\n
{<\/span>\r\n  reviews<\/span>(<\/span>first<\/span>:<\/span> 10<\/span>)<\/span> {<\/span>\r\n    edges<\/span> {<\/span>\r\n      cursor<\/span>\r\n      node<\/span> {<\/span>\r\n        id<\/span>\r\n        title<\/span>\r\n        body<\/span>\r\n      }<\/span>\r\n    }<\/span>\r\n    pageInfo<\/span>{<\/span>\r\n      endCursor<\/span>\r\n      hasNextPage<\/span>\r\n      startCursor<\/span>\r\n      hasPreviousPage<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u67e5\u8be2\uff08\u9996\u5148\uff1a10\uff09\u8bbe\u7f6e\u4e86\u67e5\u8be2\u7c7b\u578bquery_type\u3002\u9996\u5148\u662f\u8981\u83b7\u53d6\u7684\u6570\u91cf\u3002
\n\u5728\u8fd4\u56de\u7684reviews\u9879\u76ee\u4e2d\uff0c\u6307\u5b9a\u5728edges>node\u4e0b\u3002\u4f5c\u4e3a\u793a\u4f8b\uff0c\u6211\u4eec\u6307\u5b9a\u4e86id\u3001title\u548cbody\uff0c\u4f46\u53ea\u8fd4\u56de\u6307\u5b9a\u7684\u9879\u76ee\u3002
\n\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u9879\u76ee\u540d\u79f0\u9700\u8981\u7528\u9a7c\u5cf0\u547d\u540d\u6cd5\u6765\u6307\u5b9a\u3002\u6211\u8ba4\u4e3a\u5f53\u4f60\u7528Ruby\u7f16\u5199\u65f6\uff0c\u53ef\u80fd\u4f1a\u4e0d\u5c0f\u5fc3\u4f7f\u7528\u86c7\u5f62\u547d\u540d\u6cd5\uff0c\u8bf7\u6ce8\u610f\u3002
\n\uff08\u5982\u679c\u5728\u793a\u4f8b\u4e2d\u5305\u542b\u4e86\u8fd9\u6837\u7684\u9879\u76ee\u5c31\u597d\u4e86……\uff09<\/p>\n
\u6e38\u6807\uff08cursor\uff09\u548c\u9875\u9762\u4fe1\u606f\uff08pageInfo\uff09\u662f\u5728\u8fde\u63a5\uff08connections\uff09\u4e2d\u63d0\u4f9b\u7684\u5b57\u6bb5\u3002\u5728\u89e3\u91ca\u54cd\u5e94\u7684\u540c\u65f6\u8fdb\u884c\u8bf4\u660e\u3002<\/p>\n
{<\/span>\r\n  \"data\"<\/span>:<\/span> {<\/span>\r\n    \"reviews\"<\/span>:<\/span> {<\/span>\r\n      \"edges\"<\/span>:<\/span> [<\/span>\r\n        {<\/span>\r\n          \"cursor\"<\/span>:<\/span> \"MQ\"<\/span>,<\/span>\r\n          \"node\"<\/span>:<\/span> {<\/span>\r\n            \"id\"<\/span>:<\/span> \"200\"<\/span>,<\/span>\r\n            \"title\"<\/span>:<\/span> \"title199\"<\/span>,<\/span>\r\n            \"body\"<\/span>:<\/span> \"body199\"<\/span>\r\n          }<\/span>\r\n        },<\/span>\r\n        #<\/span> ...(\u7565\uff09<\/span>\r\n        {<\/span>\r\n          \"cursor\"<\/span>:<\/span> \"MTA\"<\/span>,<\/span>\r\n          \"node\"<\/span>:<\/span> {<\/span>\r\n            \"id\"<\/span>:<\/span> \"191\"<\/span>,<\/span>\r\n            \"title\"<\/span>:<\/span> \"title190\"<\/span>,<\/span>\r\n            \"body\"<\/span>:<\/span> \"body190\"<\/span>\r\n          }<\/span>\r\n        }<\/span>\r\n      ],<\/span>\r\n      \"pageInfo\"<\/span>:<\/span> {<\/span>\r\n        \"endCursor\"<\/span>:<\/span> \"MTA\"<\/span>,<\/span>\r\n        \"hasNextPage\"<\/span>:<\/span> true<\/span>,<\/span>\r\n        \"startCursor\"<\/span>:<\/span> \"MQ\"<\/span>,<\/span>\r\n        \"hasPreviousPage\"<\/span>:<\/span> false<\/span>\r\n      }<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
cursor\u662f\u9644\u52a0\u5728\u6bcf\u4e2a\u9879\u76ee\u4e0a\u7684\u552f\u4e00\u503c\u3002\u6211\u4eec\u5c06\u5728\u83b7\u53d6\u7b2c\u4e8c\u9875\u4ee5\u53ca\u4e4b\u540e\u7684\u9875\u9762\u65f6\u4f7f\u7528\u5b83\u3002
\npageInfo\u6b63\u5982\u5176\u540d\uff0c\u4f1a\u8fd4\u56de\u5f53\u524d\u9875\u9762\u7684\u4fe1\u606f\u3002\u5982\u679c\u4e0d\u9700\u8981\u8be5\u4fe1\u606f\uff0c\u53ef\u4ee5\u7701\u7565\u3002
\n\u4ece\u540d\u79f0\u5c31\u53ef\u4ee5\u63a8\u6d4b\u51fa\u6765\uff0c\u6211\u4e5f\u4f1a\u7b80\u8981\u89e3\u91ca\u6bcf\u4e2a\u9879\u76ee\u3002
\nendCursor\uff1a\u5c06\u8bbe\u7f6e\u4e3a\u83b7\u53d6\u5230\u7684\u6700\u540e\u4e00\u4e2a\u9879\u76ee\u7684cursor\u3002
\nhasNextPage\uff1a\u5224\u65ad\u662f\u5426\u6709\u5728\u83b7\u53d6\u7684\u6570\u636e\u4e4b\u540e\u8fd8\u6709\u6570\u636e\uff1f\u672c\u6b21\u662f\u6709\u6570\u636e\u7684\uff0c\u6240\u4ee5\u8bbe\u7f6e\u4e3atrue\u3002
\nstartCursor\uff1a\u5c06\u8bbe\u7f6e\u4e3a\u83b7\u53d6\u5230\u7684\u7b2c\u4e00\u4e2a\u9879\u76ee\u7684cursor\u3002
\nhasPreviousPage\uff1a\u5224\u65ad\u662f\u5426\u6709\u5728\u83b7\u53d6\u7684\u6570\u636e\u4e4b\u524d\u8fd8\u6709\u6570\u636e\uff1f\u672c\u6b21\u83b7\u53d6\u7684\u662f\u9996\u4e2a\u9879\u76ee\uff0c\u6240\u4ee5\u8bbe\u7f6e\u4e3afalse\u3002<\/p>\n
\u53ef\u4ee5\u901a\u8fc7\u5c06after\u6307\u5b9a\u4e3a\u7b2c\u4e00\u9875\u7684\u6700\u540e\u4e00\u4e2acursor\u6765\u83b7\u53d6\u7b2c\u4e8c\u9875\u7684\u5185\u5bb9\uff0c\u4ece\u6307\u5b9a\u7684cursor\u4e0b\u4e00\u4e2a\u9879\u76ee\u5f00\u59cb\u83b7\u53d6\u3002<\/p>\n
{<\/span>\r\n  reviews<\/span>(<\/span>first<\/span>:<\/span> 10<\/span>,<\/span> after<\/span>:<\/span> \"MTA\"<\/span>)<\/span> {<\/span>\r\n    edges<\/span> {<\/span>\r\n      cursor<\/span>\r\n      node<\/span> {<\/span>\r\n        id<\/span>\r\n        title<\/span>\r\n        body<\/span>\r\n      }<\/span>\r\n    }<\/span>\r\n    pageInfo<\/span>{<\/span>\r\n      endCursor<\/span>\r\n      hasNextPage<\/span>\r\n      startCursor<\/span>\r\n      hasPreviousPage<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
{<\/span>\r\n  \"data\"<\/span>:<\/span> {<\/span>\r\n    \"reviews\"<\/span>:<\/span> {<\/span>\r\n      \"edges\"<\/span>:<\/span> [<\/span>\r\n        {<\/span>\r\n          \"cursor\"<\/span>:<\/span> \"MTE\"<\/span>,<\/span>\r\n          \"node\"<\/span>:<\/span> {<\/span>\r\n            \"id\"<\/span>:<\/span> \"190\"<\/span>,<\/span>\r\n            \"title\"<\/span>:<\/span> \"title189\"<\/span>,<\/span>\r\n            \"body\"<\/span>:<\/span> \"body189\"<\/span>\r\n          }<\/span>\r\n        },<\/span>\r\n        #<\/span> ...(\u7565\uff09<\/span>\r\n        {<\/span>\r\n          \"cursor\"<\/span>:<\/span> \"MjA\"<\/span>,<\/span>\r\n          \"node\"<\/span>:<\/span> {<\/span>\r\n            \"id\"<\/span>:<\/span> \"181\"<\/span>,<\/span>\r\n            \"title\"<\/span>:<\/span> \"title180\"<\/span>,<\/span>\r\n            \"body\"<\/span>:<\/span> \"body180\"<\/span>\r\n          }<\/span>\r\n        }<\/span>\r\n      ],<\/span>\r\n      \"pageInfo\"<\/span>:<\/span> {<\/span>\r\n        \"endCursor\"<\/span>:<\/span> \"MjA\"<\/span>,<\/span>\r\n        \"hasNextPage\"<\/span>:<\/span> true<\/span>,<\/span>\r\n        \"startCursor\"<\/span>:<\/span> \"MTE\"<\/span>,<\/span>\r\n        \"hasPreviousPage\"<\/span>:<\/span> false<\/span>\r\n      }<\/span>\r\n    }<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u51e0\u4e4e\u5982\u9884\u671f\u7684\u7ed3\u679c\u8fd4\u56de\u4e86\uff0c\u4f46\u524d\u4e00\u9875\u660e\u660e\u8fd8\u5b58\u5728\u5374\u663e\u793ahasPreviousPage\u4e3afalse\u3002\u6211\u731c\u6d4b\u5728\u53c2\u6570\u4e2d\u6307\u5b9a\u4e86first+after\u65f6\uff0c\u660e\u786e\u5b58\u5728\u524d\u4e00\u9875\uff0c\u6240\u4ee5\u8fd9\u4e2a\u529f\u80fd\u53ef\u80fd\u65e0\u6548\u3002\u6211\u5f88\u5728\u610f\uff0c\u6240\u4ee5\u8ba9\u6211\u4eec\u5728\u4e0b\u4e00\u7ae0\u4e2d\u770b\u4e00\u4e0b\u6e90\u4ee3\u7801\u3002<\/p>\n
\u9605\u8bfb\u6e90\u4ee3\u7801<\/h1>\n
\u8bc4\u5ba1\u7c7b\u578b.connection_type<\/h2>\n
\u6211\u5011\u4f86\u770b\u4e00\u4e0b\u53ea\u9700\u5beb”ReviewType.connection_type”\u5c31\u53ef\u4ee5\u4f7f\u7528ReviewType\u7684connection_type\u7684\u8655\u7406\u65b9\u5f0f\u3002
\n\u6211\u8ffd\u8e64\u4e86connection_type\u65b9\u6cd5\u7684\u6e90\u78bc\u3002<\/p>\n
def<\/span> connection_type<\/span>\r\n  @connection_type<\/span> ||=<\/span> define_connection<\/span>\r\nend<\/span>\r\n\r\ndef<\/span> define_connection<\/span>(<\/span>**<\/span>kwargs<\/span>,<\/span> &<\/span>block<\/span>)<\/span>\r\n  GraphQL<\/span>::<\/span>Relay<\/span>::<\/span>ConnectionType<\/span>.<\/span>create_type<\/span>(<\/span>self<\/span>,<\/span> **<\/span>kwargs<\/span>,<\/span> &<\/span>block<\/span>)<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u4ee5\u6c49\u8bed\u8fdb\u884c\u7b80\u8ff0<\/p>\n
 def<\/span> self<\/span>.<\/span>create_type<\/span>(<\/span>wrapped_type<\/span>,<\/span> edge_type: <\/span>nil<\/span>,<\/span> edge_class: <\/span>GraphQL<\/span>::<\/span>Relay<\/span>::<\/span>Edge<\/span>,<\/span> nodes_field: <\/span>ConnectionType<\/span>.<\/span>default_nodes_field<\/span>,<\/span> &<\/span>block<\/span>)<\/span>\r\n   custom_edge_class<\/span> =<\/span> edge_class<\/span>\r\n\r\n   # Any call that would trigger `wrapped_type.ensure_defined`<\/span>\r\n   # must be inside this lazy block, otherwise we get weird<\/span>\r\n   # cyclical dependency errors :S<\/span>\r\n   ObjectType<\/span>.<\/span>define<\/span> do<\/span>\r\n     type_name<\/span> =<\/span> wrapped_type<\/span>.<\/span>is_a?<\/span>(<\/span>GraphQL<\/span>::<\/span>BaseType<\/span>)<\/span> ?<\/span> wrapped_type<\/span>.<\/span>name<\/span> :<\/span> wrapped_type<\/span>.<\/span>graphql_name<\/span>\r\n     edge_type<\/span> ||=<\/span> wrapped_type<\/span>.<\/span>edge_type<\/span>\r\n     name<\/span>(<\/span>\"<\/span>#{<\/span>type_name<\/span>}<\/span>Connection\"<\/span>)<\/span>\r\n     description<\/span>(<\/span>\"The connection type for <\/span>#{<\/span>type_name<\/span>}<\/span>.\"<\/span>)<\/span>\r\n     field<\/span> :edges<\/span>,<\/span> types<\/span>[<\/span>edge_type<\/span>],<\/span> \"A list of edges.\"<\/span>,<\/span> edge_class: <\/span>custom_edge_class<\/span>,<\/span> property: :edge_nodes<\/span>\r\n\r\n     if<\/span> nodes_field<\/span>\r\n       field<\/span> :nodes<\/span>,<\/span> types<\/span>[<\/span>wrapped_type<\/span>],<\/span>  \"A list of nodes.\"<\/span>,<\/span> property: :edge_nodes<\/span>\r\n     end<\/span>\r\n\r\n     field<\/span> :pageInfo<\/span>,<\/span> !<\/span>PageInfo<\/span>,<\/span> \"Information to aid in pagination.\"<\/span>,<\/span> property: :page_info<\/span>\r\n     relay_node_type<\/span>(<\/span>wrapped_type<\/span>)<\/span>\r\n     block<\/span> &&<\/span> instance_eval<\/span>(<\/span>&<\/span>block<\/span>)<\/span>\r\n   end<\/span>\r\n end<\/span>\r\n<\/code><\/pre>\n
\u4f3c\u4e4e\u5728ObjectType.define\u4e2d\u5b9a\u4e49\u4e86\u4e00\u4e2a\u5177\u6709edges\u3001nodes\u548cpageInfo\u5b57\u6bb5\u7684connection_type\u3002\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u6211\u4eec\u9700\u8981\u5b9a\u4e49\u76f8\u540c\u7684\u5b57\u6bb5\uff0c\u4f46ReviewType.connection_type\u7684\u4e00\u884c\u4ee3\u7801\u4f7f\u5f97\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u5b83\uff0c\u8fd9\u79cd\u5b9e\u73b0\u975e\u5e38\u68d2\u3002<\/p>\n
\u5149\u6807<\/h2>\n
\u5149\u6807\u4e2d\u5305\u542b\u4e00\u4e2a\u552f\u4e00\u7684\u5b57\u7b26\u4e32\uff0c\u4f46\u662f\u5b83\u662f\u5982\u4f55\u751f\u6210\u7684\u5462\uff1f\u6211\u5c1d\u8bd5\u8ffd\u8e2a\u4e86\u8fd4\u56de\u5149\u6807\u7684\u65b9\u6cd5\u6765\u67e5\u770b\u6e90\u4ee3\u7801\u3002<\/p>\n
def<\/span> cursor<\/span>\r\n  @cursor<\/span> ||=<\/span> connection<\/span>.<\/span>cursor_from_node<\/span>(<\/span>node<\/span>)<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u5728\u6211\u56de\u6765\u4e4b\u524d\u7ed9\u6211\u53d1\u4e00\u5c01\u7535\u5b50\u90ae\u4ef6\u3002<\/p>\n
def<\/span> cursor_from_node<\/span>(<\/span>item<\/span>)<\/span>\r\n  item_index<\/span> =<\/span> paged_nodes<\/span>.<\/span>index<\/span>(<\/span>item<\/span>)<\/span>\r\n  if<\/span> item_index<\/span>.<\/span>nil?<\/span>\r\n    raise<\/span>(<\/span>\"Can't generate cursor, item not found in connection: <\/span>#{<\/span>item<\/span>}<\/span>\"<\/span>)<\/span>\r\n  else<\/span>\r\n    offset<\/span> =<\/span> item_index<\/span> +<\/span> 1<\/span> +<\/span> ((<\/span>paged_nodes_offset<\/span> ||<\/span> 0<\/span>)<\/span> -<\/span> (<\/span>relation_offset<\/span>(<\/span>sliced_nodes<\/span>)<\/span> ||<\/span> 0<\/span>))<\/span>\r\n    if<\/span> after<\/span>\r\n      offset<\/span> +=<\/span> offset_from_cursor<\/span>(<\/span>after<\/span>)<\/span>\r\n    elsif<\/span> before<\/span>\r\n      offset<\/span> +=<\/span> offset_from_cursor<\/span>(<\/span>before<\/span>)<\/span> -<\/span> 1<\/span> -<\/span> sliced_nodes_count<\/span>\r\n    end<\/span>\r\n    encode<\/span>(<\/span>offset<\/span>.<\/span>to_s<\/span>)<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u5c06\u4ee5\u4e0b\u5185\u5bb9\u4ee5\u4e2d\u6587\u8fdb\u884c\u91ca\u4e49\uff1a\u2193<\/p>\n
def<\/span> encode<\/span>(<\/span>data<\/span>)<\/span>\r\n  @encoder<\/span>.<\/span>encode<\/span>(<\/span>data<\/span>,<\/span> nonce: <\/span>true<\/span>)<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u5c06\u4ee5\u4e0b\u5185\u5bb9\u7ffb\u8bd1\u6210\u4e2d\u6587\uff0c\u53ea\u9700\u63d0\u4f9b\u4e00\u79cd\u9009\u9879\uff1a
\n\u2193<\/p>\n
def<\/span> self<\/span>.<\/span>encode<\/span>(<\/span>unencoded_text<\/span>,<\/span> nonce: <\/span>false<\/span>)<\/span>\r\n  Base64Bp<\/span>.<\/span>urlsafe_encode64<\/span>(<\/span>unencoded_text<\/span>,<\/span> padding: <\/span>false<\/span>)<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u8bf7\u964d\u4f4e\u97f3\u91cf\u3002<\/p>\n
def<\/span> urlsafe_encode64<\/span>(<\/span>bin<\/span>,<\/span> padding<\/span>:)<\/span>\r\n  str<\/span> =<\/span> strict_encode64<\/span>(<\/span>bin<\/span>).<\/span>tr<\/span>(<\/span>\"+\/\"<\/span>,<\/span> \"-_\"<\/span>)<\/span>\r\n  str<\/span> =<\/span> str<\/span>.<\/span>delete<\/span>(<\/span>\"=\"<\/span>)<\/span> unless<\/span> padding<\/span>\r\n  str<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u770b\u8d77\u6765\u5728`cursor_from_node`\u65b9\u6cd5\u4e2d\uff0c\u5b83\u8ba1\u7b97\u4e86\u5f53\u524d\u8282\u70b9\u7684\u504f\u79fb\u91cf\uff0c\u5e76\u5bf9\u5176\u8fdb\u884c\u4e86Base64\u7f16\u7801\u3002
\n\u5173\u4e8e\u751f\u6210\u552f\u4e00\u5b57\u7b26\u4e32\u7684\u65b9\u6cd5\uff0c\u6211\u6700\u521d\u4ee5\u4e3a\u4f1a\u6709\u4e9b\u590d\u6742\uff0c\u4f46\u5b9e\u9645\u4e0a\u5b83\u53ea\u662f\u5c06\u8fde\u7eed\u7684\u6570\u5b57\u8f6c\u6362\u4e3a\u5b57\u7b26\u4e32\u5f62\u5f0f\u800c\u5df2\u3002
\n\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0c\u4ece\u5b9e\u73b0\u6765\u770b\uff0c\u751f\u6210\u5149\u6807\u7684\u903b\u8f91\u4f3c\u4e4e\u5f88\u5bb9\u6613\u88ab\u66ff\u6362\uff0c\u6240\u4ee5\u5982\u679c\u4e0d\u559c\u6b22Base64\u7684\u8bdd\uff0c\u4f3c\u4e4e\u53ef\u4ee5\u8fdb\u884c\u81ea\u5b9a\u4e49\u3002<\/p>\n
\u5904\u7406\u5b8c\u6210<\/h2>\n
\u6211\u628a\u5904\u7406\u8fc7\u7a0b\u5199\u6210\u4ee5\u4e0b\u65b9\u5f0f\u3002<\/p>\n
def<\/span> reviews<\/span>\r\n  Review<\/span>.<\/span>all<\/span>.<\/span>order<\/span>(<\/span>id: :desc<\/span>)<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u6211\u53ea\u5199\u4e86\u8fd9\u4e2a\uff0c\u4f8b\u5982\u83b7\u53d6\u7b2c\u4e8c\u9875\u768410\u4e2a\u6761\u76ee\uff0c\u5c06\u4f1a\u53d1\u51fa\u5e26\u6709limit\u548coffset\u7684SQL\u8bed\u53e5\uff0c\u4ee5\u53ca\u5c06limit\u8bbe\u7f6e\u4e3a\u5de8\u5927\u6570\u503c\u7684SQL\u8bed\u53e5\u3002<\/p>\n
SELECT<\/span> `reviews`<\/span>.<\/span>*<\/span> FROM<\/span> `reviews`<\/span> ORDER<\/span> BY<\/span> `reviews`<\/span>.<\/span>`id`<\/span> DESC<\/span> LIMIT<\/span> 10<\/span> OFFSET<\/span> 10<\/span>\r\nSELECT<\/span> COUNT<\/span>(<\/span>*<\/span>)<\/span> FROM<\/span> (<\/span>SELECT<\/span> 1<\/span> AS<\/span> one<\/span> FROM<\/span> `reviews`<\/span> LIMIT<\/span> 18446744073709551615<\/span> OFFSET<\/span> 10<\/span>)<\/span> subquery_for_count<\/span>\r\n<\/code><\/pre>\n
\u6211\u8ffd\u8e2a\u4e86\u8fd9\u4e2a\u67e5\u8be2\u662f\u5982\u4f55\u88ab\u6267\u884c\u7684\u6e90\u4ee3\u7801\u3002
\n\u7531\u4e8e\u5230\u8fbe\u6267\u884c\u8fc7\u7a0b\u7684\u8def\u5f84\u5341\u5206\u590d\u6742\u800c\u65e0\u6cd5\u5b8c\u5168\u5199\u51fa\uff0c\u6240\u4ee5\u53ea\u63d0\u4f9b\u4e86\u6d89\u53ca\u7684\u90e8\u5206\u5185\u5bb9\u3002<\/p>\n
\u9996\u5148\u662f\u7b2c\u4e00\u4e2aSQL\u3002<\/p>\n
def<\/span> paged_nodes<\/span>\r\n  return<\/span> @paged_nodes<\/span> if<\/span> defined?<\/span> @paged_nodes<\/span>\r\n  items<\/span> =<\/span> sliced_nodes<\/span>\r\n  if<\/span> first<\/span>\r\n    if<\/span> relation_limit<\/span>(<\/span>items<\/span>).<\/span>nil?<\/span> ||<\/span> relation_limit<\/span>(<\/span>items<\/span>)<\/span> ><\/span> first<\/span>\r\n      items<\/span> =<\/span> items<\/span>.<\/span>limit<\/span>(<\/span>first<\/span>)<\/span>\r\n    end<\/span>\r\n  end<\/span>\r\n  if<\/span> last<\/span>\r\n    if<\/span> relation_limit<\/span>(<\/span>items<\/span>)<\/span>\r\n      if<\/span> last<\/span> <=<\/span> relation_limit<\/span>(<\/span>items<\/span>)<\/span>\r\n        offset<\/span> =<\/span> (<\/span>relation_offset<\/span>(<\/span>items<\/span>)<\/span> ||<\/span> 0<\/span>)<\/span> +<\/span> (<\/span>relation_limit<\/span>(<\/span>items<\/span>)<\/span> -<\/span> last<\/span>)<\/span>\r\n        items<\/span> =<\/span> items<\/span>.<\/span>offset<\/span>(<\/span>offset<\/span>).<\/span>limit<\/span>(<\/span>last<\/span>)<\/span>\r\n      end<\/span>\r\n    else<\/span>\r\n      slice_count<\/span> =<\/span> relation_count<\/span>(<\/span>items<\/span>)<\/span>\r\n      offset<\/span> =<\/span> (<\/span>relation_offset<\/span>(<\/span>items<\/span>)<\/span> ||<\/span> 0<\/span>)<\/span> +<\/span> slice_count<\/span> -<\/span> [<\/span>last<\/span>,<\/span> slice_count<\/span>].<\/span>min<\/span>\r\n      items<\/span> =<\/span> items<\/span>.<\/span>offset<\/span>(<\/span>offset<\/span>).<\/span>limit<\/span>(<\/span>last<\/span>)<\/span>\r\n    end<\/span>\r\n  end<\/span>\r\n  if<\/span> max_page_size<\/span> &&<\/span> !<\/span>first<\/span> &&<\/span> !<\/span>last<\/span>\r\n    if<\/span> relation_limit<\/span>(<\/span>items<\/span>).<\/span>nil?<\/span> ||<\/span> relation_limit<\/span>(<\/span>items<\/span>)<\/span> ><\/span> max_page_size<\/span>\r\n      items<\/span> =<\/span> items<\/span>.<\/span>limit<\/span>(<\/span>max_page_size<\/span>)<\/span>\r\n    end<\/span>\r\n  end<\/span>\r\n  # Store this here so we can convert the relation to an Array<\/span>\r\n  # (this avoids an extra DB call on Sequel)<\/span>\r\n  @paged_nodes_offset<\/span> =<\/span> relation_offset<\/span>(<\/span>items<\/span>)<\/span>\r\n  @paged_nodes<\/span> =<\/span> items<\/span>.<\/span>to_a<\/span>\r\nend<\/span>\r\n\r\ndef<\/span> sliced_nodes<\/span>\r\n  return<\/span> @sliced_nodes<\/span> if<\/span> defined?<\/span> @sliced_nodes<\/span>\r\n  @sliced_nodes<\/span> =<\/span> nodes<\/span>\r\n  if<\/span> after<\/span>\r\n    offset<\/span> =<\/span> (<\/span>relation_offset<\/span>(<\/span>@sliced_nodes<\/span>)<\/span> ||<\/span> 0<\/span>)<\/span> +<\/span> offset_from_cursor<\/span>(<\/span>after<\/span>)<\/span>\r\n    @sliced_nodes<\/span> =<\/span> @sliced_nodes<\/span>.<\/span>offset<\/span>(<\/span>offset<\/span>)<\/span>\r\n  end<\/span>\r\n  if<\/span> before<\/span> &&<\/span> after<\/span>\r\n    if<\/span> offset_from_cursor<\/span>(<\/span>after<\/span>)<\/span> <<\/span> offset_from_cursor<\/span>(<\/span>before<\/span>)<\/span>\r\n      @sliced_nodes<\/span> =<\/span> limit_nodes<\/span>(<\/span>@sliced_nodes<\/span>,<\/span>  offset_from_cursor<\/span>(<\/span>before<\/span>)<\/span> -<\/span> offset_from_cursor<\/span>(<\/span>after<\/span>)<\/span> -<\/span> 1<\/span>)<\/span>\r\n    else<\/span>\r\n      @sliced_nodes<\/span> =<\/span> limit_nodes<\/span>(<\/span>@sliced_nodes<\/span>,<\/span> 0<\/span>)<\/span>\r\n    end<\/span>\r\n  elsif<\/span> before<\/span>\r\n    @sliced_nodes<\/span> =<\/span> limit_nodes<\/span>(<\/span>@sliced_nodes<\/span>,<\/span> offset_from_cursor<\/span>(<\/span>before<\/span>)<\/span> -<\/span> 1<\/span>)<\/span>\r\n  end<\/span>\r\n  @sliced_nodes<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u6839\u636econnection_type\u53c2\u6570\u7684\u5b58\u5728\u4e0e\u5426\u6765\u5224\u65ad\u662f\u5426\u52a0\u4e0alimit\u548coffset\u3002\u53c2\u6570\u7684\u9884\u671f\u4f7f\u7528\u65b9\u5f0f\u662f\u4f7f\u7528first+after\uff08\u4eceafter\u7684\u4f4d\u7f6e\u5f00\u59cb\u7684xx\u6761\uff09\u6216last+before\uff08\u5728before\u7684\u4f4d\u7f6e\u4e4b\u524d\u7684xx\u6761\uff09\u7684\u7ec4\u5408\u3002\u4f46\u4ece\u5904\u7406\u7ed3\u679c\u6765\u770b\uff0c\u4f3c\u4e4e\u4e5f\u8003\u8651\u5230\u4e86\u76f8\u53cd\u7684\u53c2\u6570\u5982first\u548clast\u540c\u65f6\u5b58\u5728\u7684\u60c5\u51b5\u5e76\u5b9e\u65bd\u4e86\u76f8\u5e94\u7684\u5b9e\u73b0\u3002\u7136\u800c\uff0c\u5373\u4f7f\u6709\u8fd9\u6837\u7684\u5b9e\u73b0\uff0c\u540c\u65f6\u6307\u5b9a\u76f8\u53cd\u7684\u53c2\u6570\u53ef\u80fd\u4f1a\u5bfc\u81f4\u96be\u4ee5\u7406\u89e3\u7684\u884c\u4e3a\uff0c\u6240\u4ee5\u6700\u597d\u4e0d\u8981\u4f7f\u7528\u8fd9\u79cd\u65b9\u5f0f\u3002\u4f8b\u5982\uff0c\u5f53\u6307\u5b9afirst: 5, after: “MTA”\u5e76\u8fd4\u56de\u4ee5\u4e0b\u7ed3\u679c\u65f6\uff0c\u5982\u679c\u518d\u989d\u5916\u6307\u5b9alast: 3\u6216last: 10\u7684\u884c\u4e3a\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
# first: 5, after: \"MTA\"<\/span>\r\n[{<\/span> id: <\/span>11<\/span>,<\/span> },<\/span> {<\/span> id: <\/span>12<\/span>,<\/span> },<\/span> {<\/span> id: <\/span>13<\/span>,<\/span> },<\/span> {<\/span> id: <\/span>14<\/span>,<\/span> },<\/span> {<\/span> id: <\/span>15<\/span>,<\/span> }]<\/span>\r\n# first: 5, after: \"MTA\", last: 3<\/span>\r\n# first > last\u306e\u5834\u5408\u30015\u4ef6\u53d6\u5f97\u3057\u305f\u3082\u306e\u306e\u5f8c\u308d3\u500b\u304c\u53d6\u5f97\u3055\u308c\u308b\u3002<\/span>\r\n[{<\/span> id: <\/span>13<\/span>,<\/span> },<\/span> {<\/span> id: <\/span>14<\/span>,<\/span> },<\/span> {<\/span> id: <\/span>15<\/span>,<\/span> }]<\/span>\r\n# first: 5, after: \"MTA\", last: 10<\/span>\r\n# first <= last\u306e\u5834\u5408\u3001\u7d50\u679c\u306f\u5909\u308f\u3089\u306a\u3044\u3002<\/span>\r\n[{<\/span> id: <\/span>11<\/span>,<\/span> },<\/span> {<\/span> id: <\/span>12<\/span>,<\/span> },<\/span> {<\/span> id: <\/span>13<\/span>,<\/span> },<\/span> {<\/span> id: <\/span>14<\/span>,<\/span> },<\/span> {<\/span> id: <\/span>15<\/span>,<\/span> }]<\/span>\r\n<\/code><\/pre>\n
\u7d27\u63a5\u7740\u662f\u7b2c\u4e8c\u4e2aSQL\u3002<\/p>\n
def<\/span> relation_count<\/span>(<\/span>relation<\/span>)<\/span>\r\n  count_or_hash<\/span> =<\/span> if<\/span>(<\/span>defined?<\/span>(<\/span>ActiveRecord<\/span>::<\/span>Relation<\/span>)<\/span> &&<\/span> relation<\/span>.<\/span>is_a?<\/span>(<\/span>ActiveRecord<\/span>::<\/span>Relation<\/span>))<\/span>\r\n    relation<\/span>.<\/span>respond_to?<\/span>(<\/span>:unscope<\/span>)?<\/span> relation<\/span>.<\/span>unscope<\/span>(<\/span>:order<\/span>).<\/span>count<\/span>(<\/span>:all<\/span>)<\/span> :<\/span> relation<\/span>.<\/span>count<\/span>(<\/span>:all<\/span>)<\/span>\r\n  else<\/span> # eg, Sequel::Dataset, don't mess up others<\/span>\r\n    relation<\/span>.<\/span>count<\/span>\r\n  end<\/span>\r\n  count_or_hash<\/span>.<\/span>is_a?<\/span>(<\/span>Integer<\/span>)<\/span> ?<\/span> count_or_hash<\/span> :<\/span> count_or_hash<\/span>.<\/span>length<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u770b\u8d77\u6765\u662f\u5bf9\u8fdb\u884c\u7684\u67e5\u8be2\u4f7f\u7528.count(:all)\u8fdb\u884c\u8ba1\u6570\uff0c\u5e76\u5c06\u8ba1\u6570\u7528\u4e8e\u8ba1\u7b97\u504f\u79fb\u91cf\u3002
\n\u867d\u7136\u6709\u5f88\u5927\u7684LIMIT\u4f3c\u4e4e\u6709\u4e9b\u62c5\u5fc3\uff0c\u4f46\u662f\u5982\u679c\u53ea\u6307\u5b9a\u4e86offset\u7684\u67e5\u8be2\u6765\u8fdb\u884c\u8ba1\u6570\uff0cRails\u4f1a\u81ea\u52a8\u6dfb\u52a0\u5b83\u3002\u770b\u8d77\u6765\u60f3\u8981\u505a\u7684\u662f\u8ba1\u7b97\u504f\u79fb\u91cf\u540e\u7684\u8bb0\u5f55\u6570\u3002
\n\u6211\u5728\u63a7\u5236\u53f0\u4e0a\u4e5f\u8fdb\u884c\u4e86\u786e\u8ba4\u884c\u4e3a\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
irb<\/span>(<\/span>main<\/span>):<\/span>01<\/span>8<\/span>:<\/span>0<\/span>><\/span> Review<\/span>.<\/span>all<\/span>.<\/span>order<\/span>(<\/span>:id<\/span>).<\/span>offset<\/span>(<\/span>10<\/span>).<\/span>count<\/span>(<\/span>:all<\/span>)<\/span>\r\n   (<\/span>1.7<\/span>ms<\/span>)<\/span>  SELECT<\/span> COUNT<\/span>(<\/span>*<\/span>)<\/span> FROM<\/span> (<\/span>SELECT<\/span> 1<\/span> AS<\/span> one<\/span> FROM<\/span> `reviews`<\/span> ORDER<\/span> BY<\/span> `reviews`<\/span>.<\/span>`<\/span>id<\/span>` ASC LIMIT 18446744073709551615 OFFSET 10) subquery_for_count\r\n=> 190\r\n<\/span><\/code><\/pre>\n
\u9875\u9762\u4fe1\u606f<\/h2>\n
\u8ba9\u6211\u4eec\u6765\u770b\u4e00\u4e0bpageinfo\u9879\u76ee\u7684\u8ba1\u7b97\u65b9\u6cd5\u3002<\/p>\n
\"pageInfo\"<\/span>:<\/span> {<\/span>\r\n  \"endCursor\"<\/span>:<\/span> \"MjA\"<\/span>,<\/span>\r\n  \"hasNextPage\"<\/span>:<\/span> true<\/span>,<\/span>\r\n  \"startCursor\"<\/span>:<\/span> \"MTE\"<\/span>,<\/span>\r\n  \"hasPreviousPage\"<\/span>:<\/span> false<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6e38\u6807\u7ed3\u675f<\/h3>\n
# Used by `pageInfo`<\/span>\r\ndef<\/span> end_cursor<\/span>\r\n  if<\/span> end_node<\/span> =<\/span> (<\/span>respond_to?<\/span>(<\/span>:paged_nodes_array<\/span>,<\/span> true<\/span>)<\/span> ?<\/span> paged_nodes_array<\/span> :<\/span> paged_nodes<\/span>).<\/span>last<\/span>\r\n    return<\/span> cursor_from_node<\/span>(<\/span>end_node<\/span>)<\/span>\r\n  else<\/span>\r\n    return<\/span> nil<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u5f88\u5bb9\u6613\u7406\u89e3\u3002\u53ea\u662f\u8fd4\u56de\u9875\u5185\u6700\u540e\u4e00\u4e2a\u8282\u70b9\u7684\u5149\u6807\u3002<\/p>\n
\u6709\u4e0b\u4e00\u9875<\/h3>\n
def<\/span> has_next_page<\/span>\r\n  if<\/span> first<\/span>\r\n    if<\/span> defined?<\/span>(<\/span>ActiveRecord<\/span>::<\/span>Relation<\/span>)<\/span> &&<\/span> nodes<\/span>.<\/span>is_a?<\/span>(<\/span>ActiveRecord<\/span>::<\/span>Relation<\/span>)<\/span>\r\n      initial_offset<\/span> =<\/span> after<\/span> ?<\/span> offset_from_cursor<\/span>(<\/span>after<\/span>)<\/span> :<\/span> 0<\/span>\r\n      return<\/span> paged_nodes<\/span>.<\/span>length<\/span> >=<\/span> first<\/span> &&<\/span> nodes<\/span>.<\/span>offset<\/span>(<\/span>first<\/span> +<\/span> initial_offset<\/span>).<\/span>exists?<\/span>\r\n    end<\/span>\r\n    return<\/span> paged_nodes<\/span>.<\/span>length<\/span> >=<\/span> first<\/span> &&<\/span> sliced_nodes_count<\/span> ><\/span> first<\/span>\r\n  end<\/span>\r\n  if<\/span> GraphQL<\/span>::<\/span>Relay<\/span>::<\/span>ConnectionType<\/span>.<\/span>bidirectional_pagination<\/span> &&<\/span> last<\/span>\r\n    return<\/span> sliced_nodes_count<\/span> >=<\/span> last<\/span>\r\n  end<\/span>\r\n  false<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u6307\u5b9a\u4e86first\u53c2\u6570\uff0c\u5219\u4f3c\u4e4e\u4f1a\u5224\u65ad\u5f53\u524d\u9875\u9762\u662f\u5426\u6709\u4e0b\u4e00\u4e2a\u9879\u76ee\u5e76\u8fd4\u56de\u7ed3\u679c\u3002
\n\u4e5f\u6709\u4e00\u4e2a\u5206\u652f\u7528\u4e8e\u5904\u7406\u6307\u5b9a\u4e86last\u53c2\u6570\u7684\u60c5\u51b5\uff0c\u4f46\u6839\u636eGraphQL::Relay::ConnectionType.bidirectional_pagination\u7684\u9ed8\u8ba4\u503cfalse\uff0c\u5c06\u4e0d\u4f1a\u8fdb\u5165\u8fd9\u4e2a\u5206\u652f\u3002\u987a\u4fbf\u63d0\u4e00\u4e0b\uff0cbidirectional_pagination\u76f4\u8bd1\u8fc7\u6765\u662f\u53cc\u5411\u5206\u9875\u3002\u867d\u7136\u6211\u5f88\u597d\u5947\u5b83\u7684\u7528\u6cd5\uff0c\u4f46\u4e0e\u672c\u9898\u65e0\u5173\uff0c\u6240\u4ee5\u6211\u4eec\u5c06\u5ffd\u7565\u5b83\u3002
\n\u9664\u6b64\u4ee5\u5916\u7684\u60c5\u51b5\u4f3c\u4e4e\u90fd\u4f1a\u76f4\u63a5\u8fd4\u56defalse\uff0c\u800c\u4e0d\u68c0\u67e5\u662f\u5426\u6709\u4e0b\u4e00\u9875\u3002\u8bf7\u786e\u4fdd\u9664\u4e86\u6307\u5b9a\u4e86first\u53c2\u6570\u7684\u60c5\u51b5\u5916\u4e0d\u8981\u4f7f\u7528\u5b83\u3002<\/p>\n
\u5f00\u59cb\u6e38\u6807<\/h3>\n
# Used by `pageInfo`<\/span>\r\ndef<\/span> start_cursor<\/span>\r\n  if<\/span> start_node<\/span> =<\/span> (<\/span>respond_to?<\/span>(<\/span>:paged_nodes_array<\/span>,<\/span> true<\/span>)<\/span> ?<\/span> paged_nodes_array<\/span> :<\/span> paged_nodes<\/span>).<\/span>first<\/span>\r\n    return<\/span> cursor_from_node<\/span>(<\/span>start_node<\/span>)<\/span>\r\n  else<\/span>\r\n    return<\/span> nil<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u8fd9\u6837\u5c31\u66f4\u5bb9\u6613\u7406\u89e3\u4e86\u3002\u53ea\u662f\u8fd4\u56de\u4e86\u9875\u9762\u5185\u7b2c\u4e00\u4e2a\u8282\u70b9\u7684cursor\u3002<\/p>\n
\u6709\u524d\u4e00\u9875<\/h3>\n
def<\/span> has_previous_page<\/span>\r\n  if<\/span> last<\/span>\r\n    paged_nodes<\/span>.<\/span>length<\/span> >=<\/span> last<\/span> &&<\/span> sliced_nodes_count<\/span> ><\/span> last<\/span>\r\n  elsif<\/span> GraphQL<\/span>::<\/span>Relay<\/span>::<\/span>ConnectionType<\/span>.<\/span>bidirectional_pagination<\/span> &&<\/span> after<\/span>\r\n    # We've already paginated through the collection a bit,<\/span>\r\n    # there are nodes behind us<\/span>\r\n    offset_from_cursor<\/span>(<\/span>after<\/span>)<\/span> ><\/span> 0<\/span>\r\n  else<\/span>\r\n    false<\/span>\r\n  end<\/span>\r\nend<\/span>\r\n<\/code><\/pre>\n
\u5982\u679c\u8bbe\u7f6e\u4e86last\u53c2\u6570\uff0c\u5219\u6839\u636eoffset\u5224\u65ad\u662f\u5426\u5b58\u5728\u524d\u4e00\u9875\u5e76\u8fd4\u56de\u7ed3\u679c\u3002\u5982\u679c\u672a\u8bbe\u7f6elast\u53c2\u6570\uff0c\u5219\u8fd4\u56defalse\uff0c\u56e0\u6b64\u9664\u975e\u6307\u5b9a\u4e86last\u53c2\u6570\uff0c\u5426\u5219\u4e0d\u8981\u4f7f\u7528\u5b83\u3002
\n\u987a\u4fbf\u8bf4\u4e00\u4e0b\uff0c\u867d\u7136\u6709\u8d5e\u540c\u548c\u53cd\u5bf9\u7684\u89c2\u70b9\uff0c\u4f46\u4e2a\u4eba\u8ba4\u4e3a\uff0c\u5982\u679c\u6ca1\u6709\u610f\u4e49\uff0c\u5e94\u8be5\u5c06\u5176\u8bbe\u7f6e\u4e3anil\u800c\u4e0d\u662ffalse\u3002<\/p>\n
\u8d60\u54c1<\/h1>\n
\u5982\u679c\u5728GraphiQL\u4e2d\u6267\u884c\u5f02\u5e38\u7684\u67e5\u8be2\uff0c\u5373\u4f7f\u91cd\u65b0\u52a0\u8f7d\u9875\u9762\u4e5f\u53ef\u80fd\u65e0\u6cd5\u663e\u793a\u3002
\n\u4f3c\u4e4e\u662f\u5728\u6700\u540e\u6267\u884c\u7684\u67e5\u8be2\u88ab\u4fdd\u5b58\u5728\u672c\u5730\u5b58\u50a8\u4e2d\uff0c\u5f53\u5728\u9875\u9762\u52a0\u8f7d\u65f6\u8bfb\u53d6\u8be5\u67e5\u8be2\u65f6\u53ef\u80fd\u4f1a\u51fa\u73b0js\u9519\u8bef\u3002
\n\u5728\u51fa\u73b0\u6b64\u9519\u8bef\u65f6\uff0cChrome\u7684\u63a7\u5236\u53f0\u4f1a\u663e\u793aError: Mode graphql failed to advance stream.
\n\u5982\u679c\u9047\u5230\u8fd9\u79cd\u60c5\u51b5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u6e05\u9664\u672c\u5730\u5b58\u50a8\u4ee5\u4fee\u590d\u95ee\u9898\u3002<\/p>\n
localStorage<\/span>.<\/span>clear<\/span>();<\/span> localStorage<\/span>.<\/span>setItem<\/span> =<\/span> ()<\/span> =><\/span> {}<\/span>\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5982\u679c\u5728Rails\u5e94\u7528\u4e2d\u4f7f\u7528GraphQL\uff0c\u6709\u4e00\u4e2a\u79f0\u4e3a`graphql-ruby`\u7684\u5f3a\u5927\u7684Gem\u53ef\u4f9b\u4f7f\u7528\u3002 ht […]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-47912","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u6211\u4f7f\u7528 graphql-ruby \u8f7b\u677e\u5b9e\u73b0\u4e86\u5206\u9875\u529f\u80fd\uff0c\u56e0\u6b64\u6211\u67e5\u770b\u4e86 Gem \u505a\u4e86\u4ec0\u4e48 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u6211\u4f7f\u7528-graphql-ruby-\u8f7b\u677e\u5b9e\u73b0\u4e86\u5206\u9875\u529f\u80fd\uff0c\u56e0\u6b64\u6211\u67e5\u770b\u4e86-gem-\u505a\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u6211\u4f7f\u7528 graphql-ruby \u8f7b\u677e\u5b9e\u73b0\u4e86\u5206\u9875\u529f\u80fd\uff0c\u56e0\u6b64\u6211\u67e5\u770b\u4e86 Gem \u505a\u4e86\u4ec0\u4e48\" \/>\n<meta property=\"og:description\" content=\"\u5982\u679c\u5728Rails\u5e94\u7528\u4e2d\u4f7f\u7528GraphQL\uff0c\u6709\u4e00\u4e2a\u79f0\u4e3a`graphql-ruby`\u7684\u5f3a\u5927\u7684Gem\u53ef\u4f9b\u4f7f\u7528\u3002 ht […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u6211\u4f7f\u7528-graphql-ruby-\u8f7b\u677e\u5b9e\u73b0\u4e86\u5206\u9875\u529f\u80fd\uff0c\u56e0\u6b64\u6211\u67e5\u770b\u4e86-gem-\u505a\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - Silicon Cloud\" \/>\n<meta property=\"article:published_time\" content=\"2023-05-27T01:01:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-30T13:26:40+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/657d81f3913a08637a6ae821\/12-0.png\" \/>\n<meta name=\"author\" content=\"\u79d1, \u96c5\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u4f5c\u8005\" \/>\n\t<meta name=\"twitter:data1\" content=\"\u79d1, \u96c5\" \/>\n\t<meta name=\"twitter:label2\" content=\"\u9884\u8ba1\u9605\u8bfb\u65f6\u95f4\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 \u5206\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e4%bd%bf%e7%94%a8-graphql-ruby-%e8%bd%bb%e6%9d%be%e5%ae%9e%e7%8e%b0%e4%ba%86%e5%88%86%e9%a1%b5%e5%8a%9f%e8%83%bd%ef%bc%8c%e5%9b%a0%e6%ad%a4%e6%88%91%e6%9f%a5%e7%9c%8b%e4%ba%86-gem-%e5%81%9a\/\",\"url\":\"https:\/\/www.silicloud.com\/zh\/blog\/%e6%88%91%e4%bd%bf%e7%94%a8-graphql-ruby-%e8%bd%bb%e6%9d%be%e5%ae%9e%e7%8e%b0%e4%ba%86%e5%88%86%e9%a1%b5%e5%8a%9f%e8%83%bd%ef%bc%8c%e5%9b%a0%e6%ad%a4%e6%88%91%e6%9f%a5%e7%9c%8b%e4%ba%86-gem-%e5%81%9a\/\",\"name\":\"\u6211\u4f7f\u7528 graphql-ruby \u8f7b\u677e\u5b9e\u73b0\u4e86\u5206\u9875\u529f\u80fd\uff0c\u56e0\u6b64\u6211\u67e5\u770b\u4e86 Gem \u505a\u4e86\u4ec0\u4e48 - 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